Reduced number of allocations:

- do not load xml documentation keys into memory but load only the hash code and keep everything else cached on disk.
- made Dom's region a value-type.
- do not create a SortedList<string, IReturnType> for every using statement but only when the using statements actually uses aliases.
Overall SD should use ca. 10 MB RAM less when working on a big solution like SharpDevelop.sln.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@468 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/BackendBindings/CSharpBinding/Project/Src/CSharpCompletionBinding.cs

@@ -106,7 +106,7 @@ namespace CSharpBinding
 						ResolveResult resolveResult = ParserService.Resolve(result, editor.ActiveTextAreaControl.Caret.Line, editor.ActiveTextAreaControl.Caret.Column, editor.FileName, documentText);
 						if (resolveResult != null && resolveResult.ResolvedType != null) {
 							IClass underlyingClass = resolveResult.ResolvedType.GetUnderlyingClass();
-							if (underlyingClass.IsTypeInInheritanceTree(ProjectContentRegistry.Mscorlib.GetClass("System.MulticastDelegate"))) {
+							if (underlyingClass != null && underlyingClass.IsTypeInInheritanceTree(ProjectContentRegistry.Mscorlib.GetClass("System.MulticastDelegate"))) {
 								EventHandlerCompletitionDataProvider eventHandlerProvider = new EventHandlerCompletitionDataProvider(result.Expression, resolveResult);
 								eventHandlerProvider.InsertSpace = true;
 								editor.ShowCompletionWindow(eventHandlerProvider, ch);

src/AddIns/BackendBindings/CSharpBinding/Project/Src/FormattingStrategy/CSharpFormattingStrategy.cs

@@ -233,9 +233,9 @@ namespace CSharpBinding.FormattingStrategy
 		
 		
 		
-		bool IsBeforeRegion(TextArea textArea, IRegion region, int lineNr)
+		bool IsBeforeRegion(TextArea textArea, DomRegion region, int lineNr)
 		{
-			if (region == null) {
+			if (region.IsEmpty) {
 				return false;
 			}
 			return region.BeginLine - 2 <= lineNr && lineNr <= region.BeginLine;

src/AddIns/BackendBindings/CSharpBinding/Project/Src/Parser/Parser.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Andrea Paatz" email="andrea@icsharpcode.net"/>
@@ -64,7 +64,7 @@ namespace CSharpBinding.Parser
 									case "#endregion":
 										--deep;
 										if (deep == 0) {
-											cu.FoldingRegions.Add(new FoldingRegion(directive.Arg.Trim(), new DefaultRegion(directive.StartPosition, nextDirective.EndPosition)));
+											cu.FoldingRegions.Add(new FoldingRegion(directive.Arg.Trim(), new DomRegion(directive.StartPosition, nextDirective.EndPosition)));
 											goto end;
 										}
 										break;
@@ -111,7 +111,7 @@ namespace CSharpBinding.Parser
 		void AddCommentTags(ICompilationUnit cu, System.Collections.Generic.List<ICSharpCode.NRefactory.Parser.TagComment> tagComments)
 		{
 			foreach (ICSharpCode.NRefactory.Parser.TagComment tagComment in tagComments) {
-				DefaultRegion tagRegion = new DefaultRegion(tagComment.StartPosition.Y, tagComment.StartPosition.X);
+				DomRegion tagRegion = new DomRegion(tagComment.StartPosition.Y, tagComment.StartPosition.X);
 				ICSharpCode.SharpDevelop.Dom.Tag tag = new ICSharpCode.SharpDevelop.Dom.Tag(tagComment.Tag, tagRegion);
 				tag.CommentString = tagComment.CommentText;
 				cu.TagComments.Add(tag);

src/AddIns/BackendBindings/VBNetBinding/Project/Src/MyNamespaceBuilder.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
@@ -49,21 +49,21 @@ namespace VBNetBinding
 			c.Properties.Add(new DefaultProperty("Application",
 			                                     new GetClassReturnType(pc, myApp.FullyQualifiedName),
 			                                     ModifierEnum.Public | ModifierEnum.Static,
-			                                     null, null, c));
+			                                     DomRegion.Empty, DomRegion.Empty, c));
 			c.Properties.Add(new DefaultProperty("Computer",
 			                                     new GetClassReturnType(pc, myComp.FullyQualifiedName),
 			                                     ModifierEnum.Public | ModifierEnum.Static,
-			                                     null, null, c));
+			                                     DomRegion.Empty, DomRegion.Empty, c));
 			if (myForms != null) {
 				c.Properties.Add(new DefaultProperty("Forms",
 				                                     new GetClassReturnType(pc, myForms.FullyQualifiedName),
 				                                     ModifierEnum.Public | ModifierEnum.Static,
-				                                     null, null, c));
+				                                     DomRegion.Empty, DomRegion.Empty, c));
 			}
 			c.Properties.Add(new DefaultProperty("User",
 			                                     new GetClassReturnType(pc, "Microsoft.VisualBasic.ApplicationServices.User"),
 			                                     ModifierEnum.Public | ModifierEnum.Static,
-			                                     null, null, c));
+			                                     DomRegion.Empty, DomRegion.Empty, c));
 			cu.Classes.Add(c);
 			pc.UpdateCompilationUnit(null, cu, cu.FileName, false);
 		}
@@ -130,7 +130,7 @@ namespace VBNetBinding
 							properties.Add(new DefaultProperty(c.Name,
 							                                   new GetClassReturnType(this.ProjectContent, c.FullyQualifiedName),
 							                                   ModifierEnum.Public | ModifierEnum.Static,
-							                                   null, null, c));
+							                                   DomRegion.Empty, DomRegion.Empty, c));
 						}
 					}
 					return properties;

src/AddIns/BackendBindings/VBNetBinding/Project/Src/Parser/Parser.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Andrea Paatz" email="andrea@icsharpcode.net"/>
@@ -74,7 +74,7 @@ namespace VBNetBinding.Parser
 										if (nextDirective.Arg.ToLower() == "region") {
 											--deep;
 											if (deep == 0) {
-												cu.FoldingRegions.Add(new FoldingRegion(directive.Arg.Trim('"'), new DefaultRegion(directive.StartPosition, nextDirective.EndPosition)));
+												cu.FoldingRegions.Add(new FoldingRegion(directive.Arg.Trim('"'), new DomRegion(directive.StartPosition, nextDirective.EndPosition)));
 												goto end;
 											}
 										}
@@ -134,7 +134,7 @@ namespace VBNetBinding.Parser
 		{
 			foreach (ICSharpCode.NRefactory.Parser.TagComment tagComment in tagComments)
 			{
-				DefaultRegion tagRegion = new DefaultRegion(tagComment.StartPosition.Y, tagComment.StartPosition.X);
+				DomRegion tagRegion = new DomRegion(tagComment.StartPosition.Y, tagComment.StartPosition.X);
 				ICSharpCode.SharpDevelop.Dom.Tag tag = new ICSharpCode.SharpDevelop.Dom.Tag(tagComment.Tag, tagRegion);
 				tag.CommentString = tagComment.CommentText;
 				cu.TagComments.Add(tag);

src/AddIns/Misc/HtmlHelp2/Project/Configuration/AssemblyInfo.cs

@@ -31,7 +31,7 @@ using System.Runtime.CompilerServices;
 // You can specify all values by your own or you can build default build and revision
 // numbers with the '*' character (the default):
 
-[assembly: AssemblyVersion("2.0.0.3")]
+[assembly: AssemblyVersion("2.0.0.1")]
 
 // The following attributes specify the key for the sign of your assembly. See the
 // .NET Framework documentation for more information about signing.

src/Main/Base/Project/ICSharpCode.SharpDevelop.csproj

@@ -74,7 +74,7 @@
     <Compile Include="Src\Services\LanguageBinding\LanguageBindingService.cs" />
     <Compile Include="Src\Dom\ICompilationUnit.cs" />
     <Compile Include="Src\Dom\IClass.cs" />
-    <Compile Include="Src\Dom\IRegion.cs" />
+    <Compile Include="Src\Dom\Region.cs" />
     <Compile Include="Src\Dom\IField.cs" />
     <Compile Include="Src\Dom\IReturnType.cs" />
     <Compile Include="Src\Dom\IProperty.cs" />
@@ -82,7 +82,6 @@
     <Compile Include="Src\Dom\IComment.cs" />
     <Compile Include="Src\Dom\IMethod.cs" />
     <Compile Include="Src\Dom\ClassType.cs" />
-    <Compile Include="Src\Dom\Implementations\DefaultRegion.cs" />
     <Compile Include="Src\Dom\Implementations\DefaultClass.cs" />
     <Compile Include="Src\Dom\Implementations\DefaultProperty.cs" />
     <Compile Include="Src\Dom\Implementations\DefaultField.cs" />

src/Main/Base/Project/Src/Dom/FoldingRegion.cs

@@ -15,7 +15,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 	public class FoldingRegion
 	{
 		string  name;
-		IRegion region;
+		DomRegion region;
 		
 		public string Name {
 			get {
@@ -23,13 +23,13 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
-		public IRegion Region {
+		public DomRegion Region {
 			get {
 				return region;
 			}
 		}
 		
-		public FoldingRegion(string name, IRegion region)
+		public FoldingRegion(string name, DomRegion region)
 		{
 			this.name = name;
 			this.region = region;

src/Main/Base/Project/Src/Dom/IClass.cs

@@ -55,7 +55,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			get;
 		}
 		
-		IRegion Region {
+		DomRegion Region {
 			get;
 		}
 		

src/Main/Base/Project/Src/Dom/IComment.cs

@@ -23,7 +23,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			get;
 		}
 		
-		IRegion Region {
+		DomRegion Region {
 			get;
 		}
 	}

src/Main/Base/Project/Src/Dom/IEvent.cs

@@ -12,7 +12,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 {
 	public interface IEvent : IMember
 	{
-		IRegion BodyRegion {
+		DomRegion BodyRegion {
 			get;
 		}
 		

src/Main/Base/Project/Src/Dom/IMember.cs

@@ -16,7 +16,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			get;
 		}
 		
-		IRegion Region {
+		DomRegion Region {
 			get;
 		}
 		

src/Main/Base/Project/Src/Dom/IMethod.cs

@@ -13,7 +13,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 {
 	public interface IMethodOrProperty : IMember
 	{
-		IRegion BodyRegion {
+		DomRegion BodyRegion {
 			get;
 		}
 		

src/Main/Base/Project/Src/Dom/IParameter.cs

@@ -31,7 +31,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			get;
 		}
 		
-		IRegion Region {
+		DomRegion Region {
 			get;
 		}
 		

src/Main/Base/Project/Src/Dom/IProperty.cs

@@ -13,11 +13,11 @@ namespace ICSharpCode.SharpDevelop.Dom
 {
 	public interface IProperty : IMethodOrProperty
 	{
-		IRegion GetterRegion {
+		DomRegion GetterRegion {
 			get;
 		}
 
-		IRegion SetterRegion {
+		DomRegion SetterRegion {
 			get;
 		}
 

src/Main/Base/Project/Src/Dom/IRegion.cs

@@ -1,34 +0,0 @@
-// <file>
-//     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
-//     <license see="prj:///doc/license.txt">GNU General Public License</license>
-//     <owner name="Mike Krüger" email="mike@icsharpcode.net"/>
-//     <version>$Revision$</version>
-// </file>
-
-using System;
-
-namespace ICSharpCode.SharpDevelop.Dom
-{
-	public interface IRegion: IComparable
-	{
-		int BeginLine {
-			get;
-		}
-
-		int BeginColumn {
-			get;
-		}
-
-		int EndColumn {
-			get;
-			set;
-		}
-
-		int EndLine {
-			get;
-			set;
-		}
-
-		bool IsInside(int row, int column);
-	}
-}

src/Main/Base/Project/Src/Dom/IUsing.cs

@@ -12,18 +12,25 @@ namespace ICSharpCode.SharpDevelop.Dom
 {
 	public interface IUsing
 	{
-		IRegion Region {
+		DomRegion Region {
 			get;
 		}
-
+		
 		List<string> Usings {
 			get;
 		}
-
+		
+		bool HasAliases { get; }
+		
+		void AddAlias(string alias, IReturnType type);
+		
+		/// <summary>
+		/// Gets the list of aliases. Can be null when there are no aliases!
+		/// </summary>
 		SortedList<string, IReturnType> Aliases {
 			get;
 		}
-
+		
 		IReturnType SearchType(string partitialTypeName);
 		string SearchNamespace(string partitialNamespaceName);
 	}

src/Main/Base/Project/Src/Dom/Implementations/AbstractMember.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
@@ -13,9 +13,9 @@ namespace ICSharpCode.SharpDevelop.Dom
 	public abstract class AbstractMember : AbstractNamedEntity, IMember
 	{
 		IReturnType returnType;
-		IRegion     region;
+		DomRegion     region;
 		
-		public virtual IRegion Region {
+		public virtual DomRegion Region {
 			get {
 				return region;
 			}

src/Main/Base/Project/Src/Dom/Implementations/ArrayReturnType.cs

@@ -69,7 +69,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		public class ArrayIndexer : DefaultProperty
 		{
 			public ArrayIndexer(IReturnType elementType)
-				: base("Indexer", elementType, ModifierEnum.Public, null, null, ReflectionReturnType.Array.GetUnderlyingClass())
+				: base("Indexer", elementType, ModifierEnum.Public, DomRegion.Empty, DomRegion.Empty, ReflectionReturnType.Array.GetUnderlyingClass())
 			{
 				IsIndexer = true;
 			}
@@ -80,7 +80,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			List<IProperty> l = base.GetProperties();
 			ArrayIndexer property = new ArrayIndexer(elementType);
 			for (int i = 0; i < dimensions; ++i) {
-				property.Parameters.Add(new DefaultParameter("index", ReflectionReturnType.Int, null));
+				property.Parameters.Add(new DefaultParameter("index", ReflectionReturnType.Int, DomRegion.Empty));
 			}
 			l.Add(property);
 			return l;

src/Main/Base/Project/Src/Dom/Implementations/DefaultClass.cs

@@ -19,7 +19,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 	public class DefaultClass : AbstractNamedEntity, IClass, IComparable
 	{
 		ClassType classType;
-		IRegion region;
+		DomRegion region;
 		
 		ICompilationUnit compilationUnit;
 		
@@ -43,7 +43,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			this.compilationUnit = compilationUnit;
 		}
 		
-		public DefaultClass(ICompilationUnit compilationUnit, ClassType classType, ModifierEnum modifiers, IRegion region, IClass declaringType) : base(declaringType)
+		public DefaultClass(ICompilationUnit compilationUnit, ClassType classType, ModifierEnum modifiers, DomRegion region, IClass declaringType) : base(declaringType)
 		{
 			this.compilationUnit = compilationUnit;
 			this.region = region;
@@ -102,7 +102,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
-		public IRegion Region {
+		public DomRegion Region {
 			get {
 				return region;
 			}
@@ -362,7 +362,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		public IClass GetInnermostClass(int caretLine, int caretColumn)
 		{
 			foreach (IClass c in InnerClasses) {
-				if (c != null && c.Region != null && c.Region.IsInside(caretLine, caretColumn)) {
+				if (c != null && c.Region.IsInside(caretLine, caretColumn)) {
 					return c.GetInnermostClass(caretLine, caretColumn);
 				}
 			}

src/Main/Base/Project/Src/Dom/Implementations/DefaultComment.cs

@@ -16,9 +16,9 @@ namespace ICSharpCode.SharpDevelop.Dom {
 		bool    isBlockComment;
 		string  commentTag;
 		string  commentText;
-		IRegion region;
+		DomRegion region;
 		
-		public DefaultComment(bool isBlockComment, string commentTag, string commentText, IRegion region)
+		public DefaultComment(bool isBlockComment, string commentTag, string commentText, DomRegion region)
 		{
 			this.isBlockComment = isBlockComment;
 			this.commentTag = commentTag;
@@ -44,7 +44,7 @@ namespace ICSharpCode.SharpDevelop.Dom {
 			}
 		}
 		
-		public IRegion Region {
+		public DomRegion Region {
 			get {
 				return region;
 			}

src/Main/Base/Project/Src/Dom/Implementations/DefaultCompilationUnit.cs

@@ -113,7 +113,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		public IClass GetInnermostClass(int caretLine, int caretColumn)
 		{
 			foreach (IClass c in Classes) {
-				if (c != null && c.Region != null && c.Region.IsInside(caretLine, caretColumn)) {
+				if (c != null && c.Region.IsInside(caretLine, caretColumn)) {
 					return c.GetInnermostClass(caretLine, caretColumn);
 				}
 			}
@@ -133,7 +133,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			List<IClass> classes = new List<IClass>();
 			IClass innerMostClass = GetInnermostClass(caretLine, caretColumn);
 			foreach (IClass c in Classes) {
-				if (c != null && c.Region != null && c.Region.IsInside(caretLine, caretColumn)) {
+				if (c != null && c.Region.IsInside(caretLine, caretColumn)) {
 					if (c != innerMostClass) {
 						GetOuterClasses(classes, c, caretLine, caretColumn);
 						if (!classes.Contains(c)) {
@@ -151,7 +151,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			if (curClass != null && curClass.InnerClasses.Count > 0) {
 				IClass innerMostClass = GetInnermostClass(caretLine, caretColumn);
 				foreach (IClass c in curClass.InnerClasses) {
-					if (c != null && c.Region != null && c.Region.IsInside(caretLine, caretColumn)) {
+					if (c != null && c.Region.IsInside(caretLine, caretColumn)) {
 						if (c != innerMostClass) {
 							GetOuterClasses(classes, c, caretLine, caretColumn);
 							if (!classes.Contains(c)) {

src/Main/Base/Project/Src/Dom/Implementations/DefaultEvent.cs

@@ -13,7 +13,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 	[Serializable]
 	public class DefaultEvent : AbstractMember, IEvent
 	{
-		protected IRegion          bodyRegion;
+		protected DomRegion          bodyRegion;
 		protected EventAttributes  eventAttributes;
 		protected IMethod          addMethod;
 		protected IMethod          removeMethod;
@@ -25,7 +25,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
-		public virtual IRegion BodyRegion {
+		public virtual DomRegion BodyRegion {
 			get {
 				return bodyRegion;
 			}
@@ -46,7 +46,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		{
 		}
 		
-		public DefaultEvent(string name, IReturnType type, ModifierEnum m, IRegion region, IRegion bodyRegion, IClass declaringType) : base(declaringType, name)
+		public DefaultEvent(string name, IReturnType type, ModifierEnum m, DomRegion region, DomRegion bodyRegion, IClass declaringType) : base(declaringType, name)
 		{
 			this.ReturnType = type;
 			this.Region     = region;

src/Main/Base/Project/Src/Dom/Implementations/DefaultField.cs

@@ -23,7 +23,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		{
 		}
 		
-		public DefaultField(IReturnType type, string name, ModifierEnum m, IRegion region, IClass declaringType) : base(declaringType, name)
+		public DefaultField(IReturnType type, string name, ModifierEnum m, DomRegion region, IClass declaringType) : base(declaringType, name)
 		{
 			this.ReturnType = type;
 			this.Region = region;

src/Main/Base/Project/Src/Dom/Implementations/DefaultMethod.cs

@@ -15,14 +15,14 @@ namespace ICSharpCode.SharpDevelop.Dom
 	[Serializable]
 	public class Constructor : DefaultMethod
 	{
-		public Constructor(ModifierEnum m, IRegion region, IRegion bodyRegion, IClass declaringType)
+		public Constructor(ModifierEnum m, DomRegion region, DomRegion bodyRegion, IClass declaringType)
 			: base("#ctor", declaringType.DefaultReturnType,
 			       m, region, bodyRegion, declaringType)
 		{
 		}
 		
 		public Constructor(ModifierEnum m, IReturnType returnType)
-			: base("#ctor", returnType, m, null, null, null)
+			: base("#ctor", returnType, m, DomRegion.Empty, DomRegion.Empty, null)
 		{
 		}
 		
@@ -42,7 +42,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 	[Serializable]
 	public class Destructor : DefaultMethod
 	{
-		public Destructor(IRegion region, IRegion bodyRegion, IClass declaringType)
+		public Destructor(DomRegion region, DomRegion bodyRegion, IClass declaringType)
 			: base("#dtor", null, ModifierEnum.None, region, bodyRegion, declaringType)
 		{
 		}
@@ -51,7 +51,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 	[Serializable]
 	public class DefaultMethod : AbstractMember, IMethod
 	{
-		protected IRegion bodyRegion;
+		protected DomRegion bodyRegion;
 		
 		List<IParameter> parameters = null;
 		List<ITypeParameter> typeParameters = null;
@@ -100,7 +100,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
-		public virtual IRegion BodyRegion {
+		public virtual DomRegion BodyRegion {
 			get {
 				return bodyRegion;
 			}
@@ -137,7 +137,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		{
 		}
 		
-		public DefaultMethod(string name, IReturnType type, ModifierEnum m, IRegion region, IRegion bodyRegion, IClass declaringType) : base(declaringType, name)
+		public DefaultMethod(string name, IReturnType type, ModifierEnum m, DomRegion region, DomRegion bodyRegion, IClass declaringType) : base(declaringType, name)
 		{
 			this.ReturnType = type;
 			this.Region     = region;

src/Main/Base/Project/Src/Dom/Implementations/DefaultParameter.cs

@@ -22,7 +22,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		
 		protected IReturnType         returnType;
 		protected ParameterModifiers  modifier;
-		protected IRegion region;
+		protected DomRegion region;
 		List<IAttribute> attributes;
 		
 		protected DefaultParameter(string name)
@@ -38,13 +38,13 @@ namespace ICSharpCode.SharpDevelop.Dom
 			this.returnType = p.ReturnType;
 		}
 		
-		public DefaultParameter(string name, IReturnType type, IRegion region) : this(name)
+		public DefaultParameter(string name, IReturnType type, DomRegion region) : this(name)
 		{
 			returnType = type;
 			this.region = region;
 		}
 		
-		public IRegion Region {
+		public DomRegion Region {
 			get {
 				return region;
 			}

src/Main/Base/Project/Src/Dom/Implementations/DefaultProperty.cs

@@ -14,10 +14,10 @@ namespace ICSharpCode.SharpDevelop.Dom {
 	[Serializable]
 	public class DefaultProperty : AbstractMember, IProperty
 	{
-		protected IRegion bodyRegion;
+		protected DomRegion bodyRegion = DomRegion.Empty;
 		
-		IRegion getterRegion;
-		IRegion setterRegion;
+		DomRegion getterRegion = DomRegion.Empty;
+		DomRegion setterRegion = DomRegion.Empty;
 
 		protected IMethod     getterMethod;
 		protected IMethod     setterMethod;
@@ -39,7 +39,7 @@ namespace ICSharpCode.SharpDevelop.Dom {
 			}
 		}
 		
-		public virtual IRegion BodyRegion {
+		public virtual DomRegion BodyRegion {
 			get {
 				return bodyRegion;
 			}
@@ -65,7 +65,7 @@ namespace ICSharpCode.SharpDevelop.Dom {
 			}
 		}
 
-		public IRegion GetterRegion {
+		public DomRegion GetterRegion {
 			get {
 				return getterRegion;
 			}
@@ -74,7 +74,7 @@ namespace ICSharpCode.SharpDevelop.Dom {
 			}
 		}
 
-		public IRegion SetterRegion {
+		public DomRegion SetterRegion {
 			get {
 				return setterRegion;
 			}
@@ -97,13 +97,13 @@ namespace ICSharpCode.SharpDevelop.Dom {
 
 		public virtual bool CanGet {
 			get {
-				return getterRegion != null;
+				return !getterRegion.IsEmpty;
 			}
 		}
 
 		public virtual bool CanSet {
 			get {
-				return setterRegion != null;
+				return !setterRegion.IsEmpty;
 			}
 		}
 		
@@ -111,7 +111,7 @@ namespace ICSharpCode.SharpDevelop.Dom {
 		{
 		}
 		
-		public DefaultProperty(string name, IReturnType type, ModifierEnum m, IRegion region, IRegion bodyRegion, IClass declaringType) : base(declaringType, name)
+		public DefaultProperty(string name, IReturnType type, ModifierEnum m, DomRegion region, DomRegion bodyRegion, IClass declaringType) : base(declaringType, name)
 		{
 			this.ReturnType = type;
 			this.Region = region;

src/Main/Base/Project/Src/Dom/Implementations/DefaultUsing.cs

@@ -15,7 +15,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 	[Serializable]
 	public class DefaultUsing : MarshalByRefObject, IUsing
 	{
-		IRegion region;
+		DomRegion region;
 		IProjectContent projectContent;
 		
 		public DefaultUsing(IProjectContent projectContent)
@@ -23,15 +23,15 @@ namespace ICSharpCode.SharpDevelop.Dom
 			this.projectContent = projectContent;
 		}
 		
-		public DefaultUsing(IProjectContent projectContent, IRegion region) : this(projectContent)
+		public DefaultUsing(IProjectContent projectContent, DomRegion region) : this(projectContent)
 		{
 			this.region = region;
 		}
 		
 		List<string> usings  = new List<string>();
-		SortedList<string, IReturnType> aliases = new SortedList<string, IReturnType>();
+		SortedList<string, IReturnType> aliases = null;
 		
-		public IRegion Region {
+		public DomRegion Region {
 			get {
 				return region;
 			}
@@ -49,23 +49,37 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
+		public bool HasAliases {
+			get {
+				return aliases != null && aliases.Count > 0;
+			}
+		}
+		
+		public void AddAlias(string alias, IReturnType type)
+		{
+			if (aliases == null) aliases = new SortedList<string, IReturnType>();
+			aliases.Add(alias, type);
+		}
+		
 		public string SearchNamespace(string partitialNamespaceName)
 		{
-			foreach (KeyValuePair<string, IReturnType> entry in aliases) {
-				if (!entry.Value.IsDefaultReturnType)
-					continue;
-				string aliasString = entry.Key;
-				string nsName;
-				if (projectContent.Language.NameComparer.Equals(partitialNamespaceName, aliasString)) {
-					nsName = entry.Value.FullyQualifiedName;
-					if (projectContent.NamespaceExists(nsName))
-						return nsName;
-				}
-				if (partitialNamespaceName.Length > aliasString.Length) {
-					if (projectContent.Language.NameComparer.Equals(partitialNamespaceName.Substring(0, aliasString.Length + 1), aliasString + ".")) {
-						nsName = String.Concat(entry.Value.FullyQualifiedName, partitialNamespaceName.Remove(0, aliasString.Length));
-						if (projectContent.NamespaceExists(nsName)) {
+			if (HasAliases) {
+				foreach (KeyValuePair<string, IReturnType> entry in aliases) {
+					if (!entry.Value.IsDefaultReturnType)
+						continue;
+					string aliasString = entry.Key;
+					string nsName;
+					if (projectContent.Language.NameComparer.Equals(partitialNamespaceName, aliasString)) {
+						nsName = entry.Value.FullyQualifiedName;
+						if (projectContent.NamespaceExists(nsName))
 							return nsName;
+					}
+					if (partitialNamespaceName.Length > aliasString.Length) {
+						if (projectContent.Language.NameComparer.Equals(partitialNamespaceName.Substring(0, aliasString.Length + 1), aliasString + ".")) {
+							nsName = String.Concat(entry.Value.FullyQualifiedName, partitialNamespaceName.Remove(0, aliasString.Length));
+							if (projectContent.NamespaceExists(nsName)) {
+								return nsName;
+							}
 						}
 					}
 				}
@@ -82,19 +96,21 @@ namespace ICSharpCode.SharpDevelop.Dom
 		
 		public IReturnType SearchType(string partitialTypeName)
 		{
-			foreach (KeyValuePair<string, IReturnType> entry in aliases) {
-				string aliasString = entry.Key;
-				if (projectContent.Language.NameComparer.Equals(partitialTypeName, aliasString)) {
-					if (entry.Value.IsDefaultReturnType && entry.Value.GetUnderlyingClass() == null)
-						continue; // type not found, maybe entry was a namespace
-					return entry.Value;
-				}
-				if (partitialTypeName.Length > aliasString.Length) {
-					if (projectContent.Language.NameComparer.Equals(partitialTypeName.Substring(0, aliasString.Length + 1), aliasString + ".")) {
-						string className = entry.Value.FullyQualifiedName + partitialTypeName.Remove(0, aliasString.Length);
-						IClass c = projectContent.GetClass(className);
-						if (c != null) {
-							return c.DefaultReturnType;
+			if (HasAliases) {
+				foreach (KeyValuePair<string, IReturnType> entry in aliases) {
+					string aliasString = entry.Key;
+					if (projectContent.Language.NameComparer.Equals(partitialTypeName, aliasString)) {
+						if (entry.Value.IsDefaultReturnType && entry.Value.GetUnderlyingClass() == null)
+							continue; // type not found, maybe entry was a namespace
+						return entry.Value;
+					}
+					if (partitialTypeName.Length > aliasString.Length) {
+						if (projectContent.Language.NameComparer.Equals(partitialTypeName.Substring(0, aliasString.Length + 1), aliasString + ".")) {
+							string className = entry.Value.FullyQualifiedName + partitialTypeName.Remove(0, aliasString.Length);
+							IClass c = projectContent.GetClass(className);
+							if (c != null) {
+								return c.DefaultReturnType;
+							}
 						}
 					}
 				}
@@ -136,11 +152,13 @@ namespace ICSharpCode.SharpDevelop.Dom
 				builder.Append(str);
 				builder.Append(", ");
 			}
-			foreach (KeyValuePair<string, IReturnType> p in aliases) {
-				builder.Append(p.Key);
-				builder.Append("=");
-				builder.Append(p.Value.ToString());
-				builder.Append(", ");
+			if (HasAliases) {
+				foreach (KeyValuePair<string, IReturnType> p in aliases) {
+					builder.Append(p.Key);
+					builder.Append("=");
+					builder.Append(p.Value.ToString());
+					builder.Append(", ");
+				}
 			}
 			builder.Length -= 2; // remove last ", "
 			builder.Append("]");

src/Main/Base/Project/Src/Dom/NRefactoryResolver/NRefactoryASTConvertVisitor.cs

@@ -166,7 +166,7 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 			if (u.IsAlias) {
 				IReturnType rt = CreateReturnType(u.Alias);
 				if (rt != null) {
-					us.Aliases[u.Name] = rt;
+					us.AddAlias(u.Name, rt);
 				}
 			} else {
 				us.Usings.Add(u.Name);
@@ -259,14 +259,14 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 			}
 		}
 		
-		DefaultRegion GetRegion(Point start, Point end)
+		DomRegion GetRegion(Point start, Point end)
 		{
-			return new DefaultRegion(start.Y, start.X, end.Y, end.X);
+			return new DomRegion(start, end);
 		}
 		
 		public override object Visit(AST.TypeDeclaration typeDeclaration, object data)
 		{
-			DefaultRegion region = GetRegion(typeDeclaration.StartLocation, typeDeclaration.EndLocation);
+			DomRegion region = GetRegion(typeDeclaration.StartLocation, typeDeclaration.EndLocation);
 			DefaultClass c = new DefaultClass(cu, TranslateClassType(typeDeclaration.Type), ConvertModifier(typeDeclaration.Modifier, ModifierEnum.Internal), region, GetCurrentClass());
 			c.Attributes.AddRange(VisitAttributes(typeDeclaration.Attributes));
 			c.Documentation = GetDocumentation(region.BeginLine);
@@ -340,7 +340,7 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		
 		public override object Visit(AST.DelegateDeclaration delegateDeclaration, object data)
 		{
-			DefaultRegion region = GetRegion(delegateDeclaration.StartLocation, delegateDeclaration.EndLocation);
+			DomRegion region = GetRegion(delegateDeclaration.StartLocation, delegateDeclaration.EndLocation);
 			DefaultClass c = new DefaultClass(cu, ClassType.Delegate, ConvertModifier(delegateDeclaration.Modifier, ModifierEnum.Internal), region, GetCurrentClass());
 			c.Documentation = GetDocumentation(region.BeginLine);
 			c.Attributes.AddRange(VisitAttributes(delegateDeclaration.Attributes));
@@ -359,24 +359,24 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 			}
 			currentClass.Push(c); // necessary for CreateReturnType
 			ConvertTemplates(delegateDeclaration.Templates, c);
-			DefaultMethod invokeMethod = new DefaultMethod("Invoke", CreateReturnType(delegateDeclaration.ReturnType), ModifierEnum.Public, null, null, c);
+			DefaultMethod invokeMethod = new DefaultMethod("Invoke", CreateReturnType(delegateDeclaration.ReturnType), ModifierEnum.Public, DomRegion.Empty, DomRegion.Empty, c);
 			if (delegateDeclaration.Parameters != null) {
 				foreach (AST.ParameterDeclarationExpression par in delegateDeclaration.Parameters) {
 					invokeMethod.Parameters.Add(CreateParameter(par));
 				}
 			}
 			c.Methods.Add(invokeMethod);
-			invokeMethod = new DefaultMethod("BeginInvoke", CreateReturnType(typeof(IAsyncResult)), ModifierEnum.Public, null, null, c);
+			invokeMethod = new DefaultMethod("BeginInvoke", CreateReturnType(typeof(IAsyncResult)), ModifierEnum.Public, DomRegion.Empty, DomRegion.Empty, c);
 			if (delegateDeclaration.Parameters != null) {
 				foreach (AST.ParameterDeclarationExpression par in delegateDeclaration.Parameters) {
 					invokeMethod.Parameters.Add(CreateParameter(par));
 				}
 			}
-			invokeMethod.Parameters.Add(new DefaultParameter("callback", CreateReturnType(typeof(AsyncCallback)), null));
-			invokeMethod.Parameters.Add(new DefaultParameter("object", ReflectionReturnType.Object, null));
+			invokeMethod.Parameters.Add(new DefaultParameter("callback", CreateReturnType(typeof(AsyncCallback)), DomRegion.Empty));
+			invokeMethod.Parameters.Add(new DefaultParameter("object", ReflectionReturnType.Object, DomRegion.Empty));
 			c.Methods.Add(invokeMethod);
-			invokeMethod = new DefaultMethod("EndInvoke", CreateReturnType(delegateDeclaration.ReturnType), ModifierEnum.Public, null, null, c);
-			invokeMethod.Parameters.Add(new DefaultParameter("result", CreateReturnType(typeof(IAsyncResult)), null));
+			invokeMethod = new DefaultMethod("EndInvoke", CreateReturnType(delegateDeclaration.ReturnType), ModifierEnum.Public, DomRegion.Empty, DomRegion.Empty, c);
+			invokeMethod.Parameters.Add(new DefaultParameter("result", CreateReturnType(typeof(IAsyncResult)), DomRegion.Empty));
 			c.Methods.Add(invokeMethod);
 			currentClass.Pop();
 			return c;
@@ -390,15 +390,15 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		IParameter CreateParameter(AST.ParameterDeclarationExpression par, IMethod method)
 		{
 			IReturnType parType = CreateReturnType(par.TypeReference, method);
-			DefaultParameter p = new DefaultParameter(par.ParameterName, parType, new DefaultRegion(par.StartLocation, par.EndLocation));
+			DefaultParameter p = new DefaultParameter(par.ParameterName, parType, new DomRegion(par.StartLocation, par.EndLocation));
 			p.Modifiers = (ParameterModifiers)par.ParamModifier;
 			return p;
 		}
 		
 		public override object Visit(AST.MethodDeclaration methodDeclaration, object data)
 		{
-			DefaultRegion region     = GetRegion(methodDeclaration.StartLocation, methodDeclaration.EndLocation);
-			DefaultRegion bodyRegion = GetRegion(methodDeclaration.EndLocation, methodDeclaration.Body != null ? methodDeclaration.Body.EndLocation : new Point(-1, -1));
+			DomRegion region     = GetRegion(methodDeclaration.StartLocation, methodDeclaration.EndLocation);
+			DomRegion bodyRegion = GetRegion(methodDeclaration.EndLocation, methodDeclaration.Body != null ? methodDeclaration.Body.EndLocation : new Point(-1, -1));
 			DefaultClass c  = GetCurrentClass();
 			
 			DefaultMethod method = new DefaultMethod(methodDeclaration.Name, null, ConvertModifier(methodDeclaration.Modifier), region, bodyRegion, GetCurrentClass());
@@ -418,8 +418,8 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		public override object Visit(AST.OperatorDeclaration operatorDeclaration, object data)
 		{
 			DefaultClass c  = GetCurrentClass();
-			DefaultRegion region     = GetRegion(operatorDeclaration.StartLocation, operatorDeclaration.EndLocation);
-			DefaultRegion bodyRegion = GetRegion(operatorDeclaration.EndLocation, operatorDeclaration.Body != null ? operatorDeclaration.Body.EndLocation : new Point(-1, -1));
+			DomRegion region     = GetRegion(operatorDeclaration.StartLocation, operatorDeclaration.EndLocation);
+			DomRegion bodyRegion = GetRegion(operatorDeclaration.EndLocation, operatorDeclaration.Body != null ? operatorDeclaration.Body.EndLocation : new Point(-1, -1));
 			
 			DefaultMethod method = new DefaultMethod(operatorDeclaration.Name, CreateReturnType(operatorDeclaration.ConvertToType), ConvertModifier(operatorDeclaration.Modifier), region, bodyRegion, c);
 			if(operatorDeclaration.Parameters != null)
@@ -434,8 +434,8 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		
 		public override object Visit(AST.ConstructorDeclaration constructorDeclaration, object data)
 		{
-			DefaultRegion region     = GetRegion(constructorDeclaration.StartLocation, constructorDeclaration.EndLocation);
-			DefaultRegion bodyRegion = GetRegion(constructorDeclaration.EndLocation, constructorDeclaration.Body != null ? constructorDeclaration.Body.EndLocation : new Point(-1, -1));
+			DomRegion region     = GetRegion(constructorDeclaration.StartLocation, constructorDeclaration.EndLocation);
+			DomRegion bodyRegion = GetRegion(constructorDeclaration.EndLocation, constructorDeclaration.Body != null ? constructorDeclaration.Body.EndLocation : new Point(-1, -1));
 			DefaultClass c = GetCurrentClass();
 			
 			Constructor constructor = new Constructor(ConvertModifier(constructorDeclaration.Modifier), region, bodyRegion, GetCurrentClass());
@@ -452,8 +452,8 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		
 		public override object Visit(AST.DestructorDeclaration destructorDeclaration, object data)
 		{
-			DefaultRegion region     = GetRegion(destructorDeclaration.StartLocation, destructorDeclaration.EndLocation);
-			DefaultRegion bodyRegion = GetRegion(destructorDeclaration.EndLocation, destructorDeclaration.Body != null ? destructorDeclaration.Body.EndLocation : new Point(-1, -1));
+			DomRegion region     = GetRegion(destructorDeclaration.StartLocation, destructorDeclaration.EndLocation);
+			DomRegion bodyRegion = GetRegion(destructorDeclaration.EndLocation, destructorDeclaration.Body != null ? destructorDeclaration.Body.EndLocation : new Point(-1, -1));
 			
 			DefaultClass c = GetCurrentClass();
 			
@@ -466,7 +466,7 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		
 		public override object Visit(AST.FieldDeclaration fieldDeclaration, object data)
 		{
-			DefaultRegion region = GetRegion(fieldDeclaration.StartLocation, fieldDeclaration.EndLocation);
+			DomRegion region = GetRegion(fieldDeclaration.StartLocation, fieldDeclaration.EndLocation);
 			DefaultClass c = GetCurrentClass();
 			string doku = GetDocumentation(region.BeginLine);
 			if (currentClass.Count > 0) {
@@ -493,8 +493,8 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		
 		public override object Visit(AST.PropertyDeclaration propertyDeclaration, object data)
 		{
-			DefaultRegion region     = GetRegion(propertyDeclaration.StartLocation, propertyDeclaration.EndLocation);
-			DefaultRegion bodyRegion = GetRegion(propertyDeclaration.BodyStart,     propertyDeclaration.BodyEnd);
+			DomRegion region     = GetRegion(propertyDeclaration.StartLocation, propertyDeclaration.EndLocation);
+			DomRegion bodyRegion = GetRegion(propertyDeclaration.BodyStart,     propertyDeclaration.BodyEnd);
 			
 			IReturnType type = CreateReturnType(propertyDeclaration.TypeReference);
 			DefaultClass c = GetCurrentClass();
@@ -514,8 +514,8 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		
 		public override object Visit(AST.EventDeclaration eventDeclaration, object data)
 		{
-			DefaultRegion region     = GetRegion(eventDeclaration.StartLocation, eventDeclaration.EndLocation);
-			DefaultRegion bodyRegion = GetRegion(eventDeclaration.BodyStart,     eventDeclaration.BodyEnd);
+			DomRegion region     = GetRegion(eventDeclaration.StartLocation, eventDeclaration.EndLocation);
+			DomRegion bodyRegion = GetRegion(eventDeclaration.BodyStart,     eventDeclaration.BodyEnd);
 			IReturnType type = CreateReturnType(eventDeclaration.TypeReference);
 			DefaultClass c = GetCurrentClass();
 			DefaultEvent e = null;
@@ -541,8 +541,8 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		
 		public override object Visit(AST.IndexerDeclaration indexerDeclaration, object data)
 		{
-			DefaultRegion region     = GetRegion(indexerDeclaration.StartLocation, indexerDeclaration.EndLocation);
-			DefaultRegion bodyRegion = GetRegion(indexerDeclaration.BodyStart,     indexerDeclaration.BodyEnd);
+			DomRegion region     = GetRegion(indexerDeclaration.StartLocation, indexerDeclaration.EndLocation);
+			DomRegion bodyRegion = GetRegion(indexerDeclaration.BodyStart,     indexerDeclaration.BodyEnd);
 			DefaultProperty i = new DefaultProperty("Indexer", CreateReturnType(indexerDeclaration.TypeReference), ConvertModifier(indexerDeclaration.Modifier), region, bodyRegion, GetCurrentClass());
 			i.IsIndexer = true;
 			i.Documentation = GetDocumentation(region.BeginLine);

src/Main/Base/Project/Src/Dom/NRefactoryResolver/NRefactoryResolver.cs

@@ -400,10 +400,10 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 			// mode that does not parse the method bodies for the normal run (in the ParserUpdateThread or
 			// SolutionLoadThread). That could improve the parser's speed dramatically.
 			
-			if (member.Region == null) return null;
+			if (member.Region.IsEmpty) return null;
 			int startLine = member.Region.BeginLine;
 			if (startLine < 1) return null;
-			IRegion bodyRegion;
+			DomRegion bodyRegion;
 			if (member is IMethodOrProperty) {
 				bodyRegion = ((IMethodOrProperty)member).BodyRegion;
 			} else if (member is IEvent) {
@@ -411,7 +411,7 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 			} else {
 				return null;
 			}
-			if (bodyRegion == null) return null;
+			if (bodyRegion.IsEmpty) return null;
 			int endLine = bodyRegion.EndLine;
 			int offset = 0;
 			for (int i = 0; i < startLine - 1; ++i) { // -1 because the startLine must be included
@@ -482,7 +482,7 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 				LocalLookupVariable var = SearchVariable(identifier);
 				if (var != null) {
 					IReturnType type = GetVariableType(var);
-					IField field = new DefaultField(type, identifier, ModifierEnum.None, new DefaultRegion(var.StartPos, var.EndPos), callingClass);
+					IField field = new DefaultField(type, identifier, ModifierEnum.None, new DomRegion(var.StartPos, var.EndPos), callingClass);
 					return new LocalResolveResult(callingMember, field, false);
 				}
 				IParameter para = SearchMethodParameter(identifier);
@@ -492,7 +492,7 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 				}
 				if (IsSameName(identifier, "value")) {
 					IProperty property = callingMember as IProperty;
-					if (property != null && property.SetterRegion != null && property.SetterRegion.IsInside(caretLine, caretColumn)) {
+					if (property != null && property.SetterRegion.IsInside(caretLine, caretColumn)) {
 						IField field = new DefaultField(property.ReturnType, "value", ModifierEnum.None, property.Region, callingClass);
 						return new LocalResolveResult(callingMember, field, true);
 					}
@@ -650,12 +650,12 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 			if (callingClass == null)
 				return null;
 			foreach (IMethod method in callingClass.Methods) {
-				if (method.BodyRegion != null && method.BodyRegion.IsInside(caretLine, caretColumn)) {
+				if (method.BodyRegion.IsInside(caretLine, caretColumn)) {
 					return method;
 				}
 			}
 			foreach (IProperty property in callingClass.Properties) {
-				if (property.BodyRegion != null && property.BodyRegion.IsInside(caretLine, caretColumn)) {
+				if (property.BodyRegion.IsInside(caretLine, caretColumn)) {
 					return property;
 				}
 			}
@@ -939,7 +939,7 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 					foreach (LocalLookupVariable v in pair.Value) {
 						if (IsInside(new Point(caretColumn, caretLine), v.StartPos, v.EndPos)) {
 							// convert to a field for display
-							result.Add(new DefaultField(TypeVisitor.CreateReturnType(v.TypeRef, this), pair.Key, ModifierEnum.None, new DefaultRegion(v.StartPos, v.EndPos), callingClass));
+							result.Add(new DefaultField(TypeVisitor.CreateReturnType(v.TypeRef, this), pair.Key, ModifierEnum.None, new DomRegion(v.StartPos, v.EndPos), callingClass));
 							break;
 						}
 					}
@@ -978,8 +978,10 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 					}
 				}
 			}
-			foreach (string alias in u.Aliases.Keys) {
-				result.Add(alias);
+			if (u.HasAliases) {
+				foreach (string alias in u.Aliases.Keys) {
+					result.Add(alias);
+				}
 			}
 		}
 	}

src/Main/Base/Project/Src/Dom/ReflectionLayer/ReflectionClass.cs

@@ -7,7 +7,6 @@
 
 using System;
 using System.Collections;
-//using System.Xml;
 using System.Reflection;
 using System.Collections.Generic;
 using ICSharpCode.Core;
@@ -24,29 +23,47 @@ namespace ICSharpCode.SharpDevelop.Dom
 			BindingFlags.NonPublic |
 			BindingFlags.DeclaredOnly |
 			BindingFlags.Public;
-
+		
 		List<IClass> innerClasses;
-
+		
 		public override List<IClass> InnerClasses {
 			get {
 				if (innerClasses == null) {
 					innerClasses = new List<IClass>();
 					foreach (Type nestedType in type.GetNestedTypes(flags)) {
-						innerClasses.Add(new ReflectionClass(CompilationUnit, nestedType, this));
+						string name = nestedType.FullName.Replace('+', '.');
+						innerClasses.Add(new ReflectionClass(CompilationUnit, nestedType, name, this));
 					}
 				}
 				return innerClasses;
 			}
 		}
 		
+		static Dictionary<ReflectionClass, List<IField>>    fieldCache    = new Dictionary<ReflectionClass, List<IField>>();
+		static Dictionary<ReflectionClass, List<IProperty>> propertyCache = new Dictionary<ReflectionClass, List<IProperty>>();
+		static Dictionary<ReflectionClass, List<IMethod>>   methodCache   = new Dictionary<ReflectionClass, List<IMethod>>();
+		static Dictionary<ReflectionClass, List<IEvent>>    eventCache    = new Dictionary<ReflectionClass, List<IEvent>>();
+		
+		public static void ClearMemberCache()
+		{
+			fieldCache.Clear();
+			propertyCache.Clear();
+			methodCache.Clear();
+			eventCache.Clear();
+		}
+		
 		public override List<IField> Fields {
 			get {
-				List<IField> fields = new List<IField>();
-				foreach (FieldInfo field in type.GetFields(flags)) {
-					if (!field.IsPublic && !field.IsFamily) continue;
-					if (!field.IsSpecialName) {
-						fields.Add(new ReflectionField(field, this));
+				List<IField> fields;
+				if (!fieldCache.TryGetValue(this, out fields)) {
+					fields = new List<IField>();
+					foreach (FieldInfo field in type.GetFields(flags)) {
+						if (!field.IsPublic && !field.IsFamily) continue;
+						if (!field.IsSpecialName) {
+							fields.Add(new ReflectionField(field, this));
+						}
 					}
+					fieldCache.Add(this, fields);
 				}
 				return fields;
 			}
@@ -54,33 +71,40 @@ namespace ICSharpCode.SharpDevelop.Dom
 		
 		public override List<IProperty> Properties {
 			get {
-				List<IProperty> properties = new List<IProperty>();
-				foreach (PropertyInfo propertyInfo in type.GetProperties(flags)) {
-					ReflectionProperty prop = new ReflectionProperty(propertyInfo, this);
-					if (prop.IsPublic || prop.IsProtected)
-						properties.Add(prop);
+				List<IProperty> properties;
+				if (!propertyCache.TryGetValue(this, out properties)) {
+					properties = new List<IProperty>();
+					foreach (PropertyInfo propertyInfo in type.GetProperties(flags)) {
+						ReflectionProperty prop = new ReflectionProperty(propertyInfo, this);
+						if (prop.IsPublic || prop.IsProtected)
+							properties.Add(prop);
+					}
+					propertyCache.Add(this, properties);
 				}
-				
 				return properties;
 			}
 		}
 		
 		public override List<IMethod> Methods {
 			get {
-				List<IMethod> methods = new List<IMethod>();
-				
-				foreach (ConstructorInfo constructorInfo in type.GetConstructors(flags)) {
-					if (!constructorInfo.IsPublic && !constructorInfo.IsFamily) continue;
-					IMethod newMethod = new ReflectionMethod(constructorInfo, this);
-					methods.Add(newMethod);
-				}
-				
-				foreach (MethodInfo methodInfo in type.GetMethods(flags)) {
-					if (!methodInfo.IsPublic && !methodInfo.IsFamily) continue;
-					if (!methodInfo.IsSpecialName) {
-						IMethod newMethod = new ReflectionMethod(methodInfo, this);
+				List<IMethod> methods;
+				if (!methodCache.TryGetValue(this, out methods)) {
+					methods = new List<IMethod>();
+					
+					foreach (ConstructorInfo constructorInfo in type.GetConstructors(flags)) {
+						if (!constructorInfo.IsPublic && !constructorInfo.IsFamily) continue;
+						IMethod newMethod = new ReflectionMethod(constructorInfo, this);
 						methods.Add(newMethod);
 					}
+					
+					foreach (MethodInfo methodInfo in type.GetMethods(flags)) {
+						if (!methodInfo.IsPublic && !methodInfo.IsFamily) continue;
+						if (!methodInfo.IsSpecialName) {
+							IMethod newMethod = new ReflectionMethod(methodInfo, this);
+							methods.Add(newMethod);
+						}
+					}
+					methodCache.Add(this, methods);
 				}
 				return methods;
 			}
@@ -88,10 +112,13 @@ namespace ICSharpCode.SharpDevelop.Dom
 		
 		public override List<IEvent> Events {
 			get {
-				List<IEvent> events = new List<IEvent>();
-				
-				foreach (EventInfo eventInfo in type.GetEvents(flags)) {
-					events.Add(new ReflectionEvent(eventInfo, this));
+				List<IEvent> events;
+				if (!eventCache.TryGetValue(this, out events)) {
+					events = new List<IEvent>();
+					foreach (EventInfo eventInfo in type.GetEvents(flags)) {
+						events.Add(new ReflectionEvent(eventInfo, this));
+					}
+					eventCache.Add(this, events);
 				}
 				return events;
 			}
@@ -105,7 +132,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		#region VoidClass / VoidReturnType
 		public class VoidClass : ReflectionClass
 		{
-			public VoidClass(ICompilationUnit compilationUnit) : base(compilationUnit, typeof(void), null) {}
+			public VoidClass(ICompilationUnit compilationUnit) : base(compilationUnit, typeof(void), typeof(void).FullName, null) {}
 			
 			protected override IReturnType CreateDefaultReturnType() {
 				return new VoidReturnType(this);
@@ -146,14 +173,13 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
-		public ReflectionClass(ICompilationUnit compilationUnit, Type type, IClass declaringType) : base(compilationUnit, declaringType)
+		public ReflectionClass(ICompilationUnit compilationUnit, Type type, string fullName, IClass declaringType) : base(compilationUnit, declaringType)
 		{
 			this.type = type;
-			string name = type.FullName.Replace('+', '.');
-			if (name.Length > 2 && name[name.Length - 2] == '`') {
-				FullyQualifiedName = name.Substring(0, name.Length - 2);
+			if (fullName.Length > 2 && fullName[fullName.Length - 2] == '`') {
+				FullyQualifiedName = fullName.Substring(0, fullName.Length - 2);
 			} else {
-				FullyQualifiedName = name;
+				FullyQualifiedName = fullName;
 			}
 			
 			this.UseInheritanceCache = true;

src/Main/Base/Project/Src/Dom/ReflectionLayer/ReflectionProperty.cs

@@ -30,15 +30,11 @@ namespace ICSharpCode.SharpDevelop.Dom
 			
 			// show the abstract layer that we have getter & setters
 			if (propertyInfo.CanRead) {
-				GetterRegion = new DefaultRegion(0, 0, 0, 0);
-			} else {
-				GetterRegion = null;
+				GetterRegion = new DomRegion(0, 0, 0, 0);
 			}
 			
 			if (propertyInfo.CanWrite) {
-				SetterRegion = new DefaultRegion(0, 0, 0, 0);
-			} else {
-				SetterRegion = null;
+				SetterRegion = new DomRegion(0, 0, 0, 0);
 			}
 			
 			ParameterInfo[] parameterInfo = propertyInfo.GetIndexParameters();

src/Main/Base/Project/Src/Dom/Region.cs

@@ -7,67 +7,68 @@
 
 using System;
 using System.Drawing;
-using System.Diagnostics;
 
-namespace ICSharpCode.SharpDevelop.Dom {
-	
+namespace ICSharpCode.SharpDevelop.Dom
+{
 	[Serializable]
-	public class DefaultRegion : System.MarshalByRefObject, IRegion
+	public struct DomRegion : IComparable, IComparable<DomRegion>
 	{
-		protected int beginLine = -1;
-		protected int endLine = -1;
-		protected int beginColumn = -1;
-		protected int endColumn = -1;
-
-		public virtual int BeginLine {
+		readonly int beginLine;
+		readonly int endLine;
+		readonly int beginColumn;
+		readonly int endColumn;
+		
+		public readonly static DomRegion Empty = new DomRegion(-1, -1);
+		
+		public bool IsEmpty {
 			get {
-				return beginLine;
+				return BeginLine <= 0;
 			}
 		}
-
-		public virtual int BeginColumn {
+		
+		public int BeginLine {
 			get {
-				return beginColumn;
+				return beginLine;
 			}
 		}
-
+		
 		/// <value>
-		/// if the end column is == -1 the end line is -1 too
+		/// if the end line is == -1 the end column is -1 too
 		/// this stands for an unknwon end
 		/// </value>
-		public virtual int EndColumn {
+		public int EndLine {
 			get {
-				return endColumn;
+				return endLine;
 			}
-			set {
-				endColumn = value;
+		}
+		
+		public int BeginColumn {
+			get {
+				return beginColumn;
 			}
 		}
-
+		
 		/// <value>
-		/// if the end line is == -1 the end column is -1 too
+		/// if the end column is == -1 the end line is -1 too
 		/// this stands for an unknwon end
 		/// </value>
-		public virtual int EndLine {
+		public int EndColumn {
 			get {
-				return endLine;
-			}
-			set {
-				endLine = value;
+				return endColumn;
 			}
 		}
-
-		public DefaultRegion(Point start, Point end)
+		
+		public DomRegion(Point start, Point end)
 			: this(start.Y, start.X, end.Y, end.X)
 		{
 		}
 		
-		public DefaultRegion(Point start)
+		public DomRegion(Point start)
 			: this(start.Y, start.X)
 		{
 		}
 		
-		public DefaultRegion(int beginLine, int beginColumn, int endLine, int endColumn)
+		public DomRegion(int beginLine, int beginColumn, int endLine, int endColumn)
 		{
 			this.beginLine   = beginLine;
 			this.beginColumn = beginColumn;
@@ -75,10 +76,12 @@ namespace ICSharpCode.SharpDevelop.Dom {
 			this.endColumn   = endColumn;
 		}
 		
-		public DefaultRegion(int beginLine, int beginColumn)
+		public DomRegion(int beginLine, int beginColumn)
 		{
 			this.beginLine   = beginLine;
 			this.beginColumn = beginColumn;
+			this.endLine = -1;
+			this.endColumn = -1;
 		}
 		
 		/// <remarks>
@@ -88,9 +91,9 @@ namespace ICSharpCode.SharpDevelop.Dom {
 		public bool IsInside(int row, int column)
 		{
 			return row >= BeginLine &&
-			      (row <= EndLine   || EndLine == -1) &&
-			      (row != BeginLine || column >= BeginColumn) &&
-			      (row != EndLine   || column <= EndColumn);
+				(row <= EndLine   || EndLine == -1) &&
+				(row != BeginLine || column >= BeginColumn) &&
+				(row != EndLine   || column <= EndColumn);
 		}
 
 		public override string ToString()
@@ -102,7 +105,7 @@ namespace ICSharpCode.SharpDevelop.Dom {
 			                     endColumn);
 		}
 		
-		public virtual int CompareTo(IRegion value)
+		public int CompareTo(DomRegion value)
 		{
 			int cmp;
 			if (0 != (cmp = (BeginLine - value.BeginLine))) {
@@ -121,7 +124,7 @@ namespace ICSharpCode.SharpDevelop.Dom {
 		}
 		
 		int IComparable.CompareTo(object value) {
-			return CompareTo((IRegion)value);
+			return CompareTo((DomRegion)value);
 		}
 	}
 }

src/Main/Base/Project/Src/Dom/ResolveResult.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
@@ -207,11 +207,11 @@ namespace ICSharpCode.SharpDevelop.Dom
 			if (cu.FileName == null || cu.FileName.Length == 0) {
 				return null;
 			}
-			IRegion reg = field.Region;
-			if (reg != null) {
+			DomRegion reg = field.Region;
+			if (!reg.IsEmpty) {
 				return new FilePosition(cu.FileName, new Point(reg.BeginLine, reg.BeginColumn));
 			} else {
-				LoggingService.Warn("GetDefinitionPosition: field.Region is null");
+				LoggingService.Warn("GetDefinitionPosition: field.Region is empty");
 				return new FilePosition(cu.FileName, Point.Empty);
 			}
 		}
@@ -318,8 +318,8 @@ namespace ICSharpCode.SharpDevelop.Dom
 			if (cu == null || cu.FileName == null || cu.FileName.Length == 0) {
 				return null;
 			}
-			IRegion reg = resolvedClass.Region;
-			if (reg != null)
+			DomRegion reg = resolvedClass.Region;
+			if (!reg.IsEmpty)
 				return new FilePosition(cu.FileName, new Point(reg.BeginLine, reg.BeginColumn));
 			else
 				return new FilePosition(cu.FileName, Point.Empty);
@@ -383,8 +383,8 @@ namespace ICSharpCode.SharpDevelop.Dom
 			if (cu.FileName == null || cu.FileName.Length == 0) {
 				return null;
 			}
-			IRegion reg = resolvedMember.Region;
-			if (reg != null)
+			DomRegion reg = resolvedMember.Region;
+			if (!reg.IsEmpty)
 				return new FilePosition(cu.FileName, new Point(reg.BeginLine, reg.BeginColumn));
 			else
 				return new FilePosition(cu.FileName, Point.Empty);

src/Main/Base/Project/Src/Dom/Tag.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Andrea Paatz" email="andrea@icsharpcode.net"/>
@@ -21,7 +21,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		}
 		
 		string commentString;
-		IRegion region;
+		DomRegion region;
 		
 		public string CommentString {
 			get {
@@ -32,7 +32,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
-		public IRegion Region {
+		public DomRegion Region {
 			get {
 				return region;
 			}
@@ -41,7 +41,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 			}
 		}
 		
-		public Tag(string key, IRegion region)
+		public Tag(string key, DomRegion region)
 		{
 			this.key = key;
 			this.region = region;

src/Main/Base/Project/Src/Dom/XmlDoc.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
@@ -19,8 +19,32 @@ namespace ICSharpCode.SharpDevelop.Dom
 	/// </summary>
 	public class XmlDoc : IDisposable
 	{
+		struct IndexEntry : IComparable<IndexEntry> {
+			public int HashCode;
+			public int FileLocation;
+			
+			public int CompareTo(IndexEntry other)
+			{
+				return HashCode.CompareTo(other.HashCode);
+			}
+			
+			public IndexEntry(int HashCode, int FileLocation)
+			{
+				this.HashCode = HashCode;
+				this.FileLocation = FileLocation;
+			}
+		}
+		
 		Dictionary<string, string> xmlDescription = new Dictionary<string, string>();
-		Dictionary<string, int>    indexDictionary;
+		IndexEntry[] index; // SORTED array of index entries
+		Queue<string> keyCacheQueue;
+		
+		const int cacheLength = 150; // number of strings to cache when working in file-mode
+		#if DEBUG
+		const string tempPathName = "SharpDevelop/DocumentationCacheDebug";
+		#else
+		const string tempPathName = "SharpDevelop/DocumentationCache";
+		#endif
 		
 		void ReadMembersSection(XmlTextReader reader)
 		{
@@ -45,13 +69,10 @@ namespace ICSharpCode.SharpDevelop.Dom
 		public string GetDocumentation(string key)
 		{
 			lock (xmlDescription) {
-				if (indexDictionary != null) {
-					if (!indexDictionary.ContainsKey(key))
-						return null;
-				}
-				if (xmlDescription.ContainsKey(key))
-					return xmlDescription[key];
-				if (indexDictionary == null)
+				string result;
+				if (xmlDescription.TryGetValue(key, out result))
+					return result;
+				if (index == null)
 					return null;
 				return LoadDocumentation(key);
 			}
@@ -60,19 +81,23 @@ namespace ICSharpCode.SharpDevelop.Dom
 		#region Save binary files
 		// FILE FORMAT FOR BINARY DOCUMENTATION
 		// long  magic = 0x4244636f446c6d58 (identifies file type = 'XmlDocDB')
-		// short version = 1              (file version)
+		const long magic = 0x4244636f446c6d58;
+		// short version = 2              (file version)
+		const short version = 2;
 		// long  fileDate                 (last change date of xml file in DateTime ticks)
+		// int   testHashCode = magicTestString.GetHashCode() // (check if hash-code implementation is compatible)
+		// int   entryCount               (count of entries)
 		// int   indexPointer             (points to location where index starts in the file)
-		// { string docu }                (all documentation strings as length-prefixed strings)
+		// {
+		//   string key                   (documentation key as length-prefixed string)
+		//   string docu                  (xml documentation as length-prefixed string)
+		// }
 		// indexPointer points to the start of the following section:
 		// {
-		//   string key             (documentation key as length-prefixed string)
+		//   int hashcode
 		//   int    index           (index where the docu string starts in the file)
 		// }
 		
-		const long magic = 0x4244636f446c6d58;
-		const short version = 1;
-		
 		void Save(string fileName, DateTime fileDate)
 		{
 			using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.None)) {
@@ -81,21 +106,26 @@ namespace ICSharpCode.SharpDevelop.Dom
 					w.Write(version);
 					w.Write(fileDate.Ticks);
 					
+					IndexEntry[] index = new IndexEntry[xmlDescription.Count];
+					w.Write(index.Length);
+					
 					int indexPointerPos = (int)fs.Position;
 					w.Write(0); // skip 4 bytes
-					int[] indices = new int[xmlDescription.Count];
 					
 					int i = 0;
 					foreach (KeyValuePair<string, string> p in xmlDescription) {
-						indices[i++] = (int)fs.Position;
+						index[i] = new IndexEntry(p.Key.GetHashCode(), (int)fs.Position);
+						w.Write(p.Key);
 						w.Write(p.Value.Trim());
+						i += 1;
 					}
 					
+					Array.Sort(index);
+					
 					int indexStart = (int)fs.Position;
-					i = 0;
-					foreach (KeyValuePair<string, string> p in xmlDescription) {
-						w.Write(p.Key);
-						w.Write(indices[i++]);
+					foreach (IndexEntry entry in index) {
+						w.Write(entry.HashCode);
+						w.Write(entry.FileLocation);
 					}
 					w.Seek(indexPointerPos, SeekOrigin.Begin);
 					w.Write(indexStart);
@@ -107,12 +137,9 @@ namespace ICSharpCode.SharpDevelop.Dom
 		#region Load binary files
 		BinaryReader loader;
 		FileStream fs;
-		Queue<string> keyCacheQueue;
-		const int cacheLength = 150; // number of strings to cache when working in file-mode
 		
 		bool LoadFromBinary(string fileName, DateTime fileDate)
 		{
-			indexDictionary = new Dictionary<string, int>();
 			keyCacheQueue   = new Queue<string>(cacheLength);
 			fs = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
 			int len = (int)fs.Length;
@@ -130,21 +157,18 @@ namespace ICSharpCode.SharpDevelop.Dom
 					LoggingService.Info("Not loading XmlDoc: file changed since cache was created");
 					return false;
 				}
+				int count = loader.ReadInt32();
 				int indexStartPosition = loader.ReadInt32(); // go to start of index
 				if (indexStartPosition >= len) {
 					LoggingService.Error("XmlDoc: Cannot find index, cache invalid!");
 					return false;
 				}
 				fs.Position = indexStartPosition;
-				while (fs.Position < len) {
-					string key = loader.ReadString();
-					int pos = loader.ReadInt32();
-					indexDictionary.Add(key, pos);
-				}
-				if (fs.Position > len) {
-					LoggingService.Error("XmlDoc: Jumped over end of file, cache invalid!");
-					return false;
+				IndexEntry[] index = new IndexEntry[count];
+				for (int i = 0; i < index.Length; i++) {
+					index[i] = new IndexEntry(loader.ReadInt32(), loader.ReadInt32());
 				}
+				this.index = index;
 				return true;
 			} catch (Exception ex) {
 				LoggingService.Error("Cannot load from cache", ex);
@@ -157,12 +181,34 @@ namespace ICSharpCode.SharpDevelop.Dom
 			if (keyCacheQueue.Count > cacheLength - 1) {
 				xmlDescription.Remove(keyCacheQueue.Dequeue());
 			}
-			int pos = indexDictionary[key];
-			fs.Position = pos;
-			string docu = loader.ReadString();
-			xmlDescription.Add(key, docu);
-			keyCacheQueue.Enqueue(docu);
-			return docu;
+			
+			int hashcode = key.GetHashCode();
+			
+			// use interpolation search to find the item
+			string resultDocu = null;
+			
+			int m = Array.BinarySearch(index, new IndexEntry(hashcode, 0));
+			if (m >= 0) {
+				// correct hash code found.
+				// possibly there are multiple items with the same hash, so go to the first.
+				while (--m >= 0 && index[m].HashCode == hashcode);
+				// go through all items that have the correct hash
+				while (++m < index.Length && index[m].HashCode == hashcode) {
+					fs.Position = index[m].FileLocation;
+					string keyInFile = loader.ReadString();
+					if (keyInFile == key) {
+						resultDocu = loader.ReadString();
+						break;
+					} else {
+						LoggingService.Warn("Found " + keyInFile + " instead of " + key);
+					}
+				}
+			}
+			
+			keyCacheQueue.Enqueue(key);
+			xmlDescription.Add(key, resultDocu);
+			
+			return resultDocu;
 		}
 		
 		public void Dispose()
@@ -172,7 +218,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 				fs.Close();
 			}
 			xmlDescription = null;
-			indexDictionary = null;
+			index = null;
 			keyCacheQueue = null;
 			loader = null;
 			fs = null;
@@ -198,7 +244,7 @@ namespace ICSharpCode.SharpDevelop.Dom
 		
 		static string MakeTempPath()
 		{
-			string tempPath = Path.Combine(Path.GetTempPath(), "SharpDevelop/DocumentationCache");
+			string tempPath = Path.Combine(Path.GetTempPath(), tempPathName);
 			if (!Directory.Exists(tempPath))
 				Directory.CreateDirectory(tempPath);
 			return tempPath;

src/Main/Base/Project/Src/Gui/Pads/ClassBrowser/Nodes/ClassNode.cs

@@ -54,9 +54,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 		public override void ActivateItem()
 		{
 			if (c.CompilationUnit != null) {
-				FileService.JumpToFilePosition(c.CompilationUnit.FileName,
-				                               c.Region != null ? c.Region.BeginLine - 1 : 0,
-				                               c.Region != null ? c.Region.BeginColumn - 1 : 0);
+				FileService.JumpToFilePosition(c.CompilationUnit.FileName, c.Region.BeginLine - 1, c.Region.BeginColumn - 1);
 			}
 		}
 		

src/Main/Base/Project/Src/Gui/Pads/ClassBrowser/Nodes/MemberNode.cs

@@ -63,10 +63,8 @@ namespace ICSharpCode.SharpDevelop.Gui
 			this.ContextmenuAddinTreePath = "/SharpDevelop/Pads/ClassBrowser/MemberContextMenu";
 			declaringType = member.DeclaringType;
 			modifiers = member.Modifiers;
-			if (member.Region != null) {
-				line   = member.Region.BeginLine;
-				column = member.Region.BeginColumn;
-			}
+			line   = member.Region.BeginLine;
+			column = member.Region.BeginColumn;
 		}
 		
 		public static string GetText(IMember member)

src/Main/Base/Project/Src/Gui/Pads/PropertyPad/PropertyPad.cs

@@ -75,7 +75,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 		
 		static Panel         panel   = null;
 		static ComboBox      comboBox = null;
-		static PropertyGrid  grid = null;
+		static PropertyGrid  grid = new PropertyGrid();
 		static IDesignerHost host = null;
 		
 		public static PropertyGrid Grid {
@@ -85,7 +85,11 @@ namespace ICSharpCode.SharpDevelop.Gui
 		}
 		
 		public static event PropertyValueChangedEventHandler PropertyValueChanged;
-		public static event EventHandler                     SelectedObjectChanged;
+		
+		public static event EventHandler SelectedObjectChanged {
+			add    { grid.SelectedObjectsChanged += value; }
+			remove { grid.SelectedObjectsChanged -= value; }
+		}
 		
 		public override Control Control {
 			get {
@@ -95,7 +99,6 @@ namespace ICSharpCode.SharpDevelop.Gui
 		
 		static PropertyPad()
 		{
-			grid = new PropertyGrid();
 			grid.PropertySort = PropertyService.Get("FormsDesigner.DesignerOptions.PropertyGridSortAlphabetical", false) ? PropertySort.Alphabetical : PropertySort.CategorizedAlphabetical;
 			grid.Dock = DockStyle.Fill;
 
@@ -119,11 +122,11 @@ namespace ICSharpCode.SharpDevelop.Gui
 		{
 			instance = this;
 			panel = new Panel();
-						
+			
 			comboBox.DrawItem += new DrawItemEventHandler(ComboBoxDrawItem);
 			comboBox.MeasureItem += new MeasureItemEventHandler(ComboBoxMeasureItem);
 			comboBox.SelectedIndexChanged += new EventHandler(ComboBoxSelectedIndexChanged);
-		
+			
 			
 			panel.Controls.Add(grid);
 			panel.Controls.Add(comboBox);
@@ -153,7 +156,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 			
 			if (item is IComponent) {
 				ISite site = ((IComponent)item).Site;
-				if (site != null) {	
+				if (site != null) {
 					string name = site.Name;
 					Font f = new Font(comboBox.Font, FontStyle.Bold);
 					mea.ItemWidth += (int)mea.Graphics.MeasureString(name + "-", f).Width;
@@ -185,7 +188,7 @@ namespace ICSharpCode.SharpDevelop.Gui
 			
 			if (item is IComponent) {
 				ISite site = ((IComponent)item).Site;
-				if (site != null) {	
+				if (site != null) {
 					string name = site.Name;
 					Font f = new Font(comboBox.Font, FontStyle.Bold);
 					g.DrawString(name, f, stringColor, xPos, dea.Bounds.Y);
@@ -205,14 +208,11 @@ namespace ICSharpCode.SharpDevelop.Gui
 					ISelectionService selectionService = (ISelectionService)host.GetService(typeof(ISelectionService));
 					if (comboBox.SelectedIndex >= 0) {
 						selectionService.SetSelectedComponents(new object[] {comboBox.Items[comboBox.SelectedIndex] });
-          				} else {
+					} else {
 						SetDesignableObject(null);
 						selectionService.SetSelectedComponents(new object[] { });
 					}
 				}
-				if (SelectedObjectChanged != null) {
-					SelectedObjectChanged(this, EventArgs.Empty);
-				}
 			}
 		}
 		
@@ -289,15 +289,15 @@ namespace ICSharpCode.SharpDevelop.Gui
 			if (host != null) {
 				grid.Site = (new IDEContainer(host)).CreateSite(grid);
 				grid.PropertyTabs.AddTabType(typeof(System.Windows.Forms.Design.EventsTab), PropertyTabScope.Document);
-			
+				
 				ISelectionService selectionService = (ISelectionService)host.GetService(typeof(ISelectionService));
 				if (selectionService != null) {
 					selectionService.SelectionChanging += new EventHandler(SelectionChangingHandler);
 					selectionService.SelectionChanged  += new EventHandler(SelectionChangedHandler);
 				}
-			
+				
 				host.TransactionClosed += new DesignerTransactionCloseEventHandler(TransactionClose);
-			
+				
 				IComponentChangeService componentChangeService = (IComponentChangeService)host.GetService(typeof(IComponentChangeService));
 				if (componentChangeService != null) {
 					componentChangeService.ComponentAdded   += new ComponentEventHandler(UpdateSelectedObjects);
@@ -338,8 +338,12 @@ namespace ICSharpCode.SharpDevelop.Gui
 					ICSharpCode.SharpDevelop.Dom.IClass c = ProjectContentRegistry.WinForms.GetClass(component.FullName);
 					if (c != null) {
 						foreach (ICSharpCode.SharpDevelop.Dom.IProperty p in c.DefaultReturnType.GetProperties()) {
-							ICSharpCode.SharpDevelop.Dom.HelpProvider.ShowHelp(p);
+							if (gridItem.PropertyDescriptor.Name == p.Name) {
+								ICSharpCode.SharpDevelop.Dom.HelpProvider.ShowHelp(p);
+								return;
+							}
 						}
+						ICSharpCode.SharpDevelop.Dom.HelpProvider.ShowHelp(c);
 					}
 				}
 			}

src/Main/Base/Project/Src/Services/AmbienceService/AmbienceReflectionDecorator.cs

@@ -89,7 +89,7 @@ namespace ICSharpCode.Core
 		
 		public string Convert(Type type)
 		{
-			return conv.Convert(new ReflectionClass(null, type, null));
+			return conv.Convert(new ReflectionClass(null, type, type.FullName.Replace('+', '.'), null));
 		}
 		
 		public string Convert(FieldInfo field)

src/Main/Base/Project/Src/Services/ParserService/DefaultProjectContent.cs

@@ -634,7 +634,7 @@ namespace ICSharpCode.Core
 		{
 			IClass curClass = GetClass(fullMemberName, LanguageProperties.CSharp, false);
 			if (curClass != null) {
-				return new Position(curClass.CompilationUnit, curClass.Region != null ? curClass.Region.BeginLine : -1, curClass.Region != null ? curClass.Region.BeginColumn : -1);
+				return new Position(curClass.CompilationUnit, curClass.Region.BeginLine, curClass.Region.BeginColumn);
 			}
 			int pos = fullMemberName.LastIndexOf('.');
 			if (pos > 0) {
@@ -644,7 +644,7 @@ namespace ICSharpCode.Core
 				if (curClass != null) {
 					IMember member = curClass.SearchMember(memberName, LanguageProperties.CSharp);
 					if (member != null) {
-						return new Position(curClass.CompilationUnit, member.Region != null ? member.Region.BeginLine : -1, member.Region != null ? member.Region.BeginColumn : -1);
+						return new Position(curClass.CompilationUnit, member.Region.BeginLine, member.Region.BeginColumn);
 					}
 				}
 			}

src/Main/Base/Project/Src/Services/ParserService/ParserService.cs

@@ -185,9 +185,15 @@ namespace ICSharpCode.Core
 			LoggingService.Info("ParserUpdateThread started");
 			// preload mscorlib, we're going to need it anyway
 			IProjectContent dummyVar = ProjectContentRegistry.Mscorlib;
+			int counter = 0;
 			
 			while (!abortParserUpdateThread) {
 				try {
+					if (++counter == 10) {
+						ReflectionClass.ClearMemberCache();
+						counter = 0;
+					}
+					
 					ParserUpdateStep();
 				} catch (Exception e) {
 					ICSharpCode.Core.MessageService.ShowError(e);

src/Main/Base/Project/Src/Services/ParserService/ReflectionProjectContent.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
@@ -35,8 +35,9 @@ namespace ICSharpCode.Core
 			
 			try {
 				foreach (Type type in assembly.GetExportedTypes()) {
-					if (!type.IsNested) {
-						AddClassToNamespaceListInternal(new ReflectionClass(assemblyCompilationUnit, type, null));
+					string name = type.FullName;
+					if (name.IndexOf('+') < 0) { // type.IsNested 
+						AddClassToNamespaceListInternal(new ReflectionClass(assemblyCompilationUnit, type, name, null));
 					}
 				}
 			} catch (Exception ex) {

src/Main/Base/Project/Src/Services/RefactoringService/RefactoringMenuBuilder.cs

@@ -116,12 +116,12 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 				return null;
 			}
 			foreach (IMethod method in callingClass.Methods) {
-				if (method.BodyRegion != null && method.BodyRegion.IsInside(caretLine, caretColumn)) {
+				if (method.BodyRegion.IsInside(caretLine, caretColumn)) {
 					return method;
 				}
 			}
 			foreach (IProperty property in callingClass.Properties) {
-				if (property.BodyRegion != null && property.BodyRegion.IsInside(caretLine, caretColumn)) {
+				if (property.BodyRegion.IsInside(caretLine, caretColumn)) {
 					return property;
 				}
 			}
@@ -154,7 +154,7 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 			return MakeItem(c.FullyQualifiedName, new ClassNode(c.ProjectContent.Project, c), c.CompilationUnit, c.Region);
 		}
 		
-		ToolStripMenuItem MakeItem(string title, ExtTreeNode classBrowserTreeNode, ICompilationUnit cu, IRegion region)
+		ToolStripMenuItem MakeItem(string title, ExtTreeNode classBrowserTreeNode, ICompilationUnit cu, DomRegion region)
 		{
 			ToolStripMenuItem item = new ToolStripMenuItem(classBrowserTreeNode.Text, ClassBrowserIconService.ImageList.Images[classBrowserTreeNode.ImageIndex]);
 			
@@ -163,7 +163,7 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 			//item.DropDown.Items.Add(titleItem);
 			//item.DropDown.Items.Add(new ToolStripSeparator());
 			
-			if (cu.FileName != null && region != null) {
+			if (cu.FileName != null && !region.IsEmpty) {
 				ToolStripMenuItem gotoDefinitionItem = new ToolStripMenuItem(StringParser.Parse("${res:ICSharpCode.NAntAddIn.GotoDefinitionMenuLabel}"),
 				                                                             ClassBrowserIconService.ImageList.Images[ClassBrowserIconService.GotoArrowIndex]);
 				gotoDefinitionItem.ShortcutKeys = Keys.Control | Keys.Enter;

src/Main/Base/Project/Src/TextEditor/Commands/ClassBookmarkMenuBuilder.cs

@@ -105,7 +105,7 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Commands
 			RenameReferences(list, newName);
 		}
 		
-		void AddDeclarationAsReference(List<Reference> list, string fileName, IRegion region, string name)
+		void AddDeclarationAsReference(List<Reference> list, string fileName, DomRegion region, string name)
 		{
 			if (fileName == null)
 				return;

src/Main/Base/Project/Src/TextEditor/Commands/ClassMemberMenuBuilder.cs

@@ -161,7 +161,7 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Commands
 				if (derivedClass.CompilationUnit == null) continue;
 				if (derivedClass.CompilationUnit.FileName == null) continue;
 				IMember m = RefactoringService.FindSimilarMember(derivedClass, member);
-				if (m != null && m.Region != null) {
+				if (!m.Region.IsEmpty) {
 					SearchResult res = new SimpleSearchResult(m.FullyQualifiedName, new Point(m.Region.BeginColumn - 1, m.Region.BeginLine - 1));
 					res.ProvidedDocumentInformation = GetDocumentInformation(derivedClass.CompilationUnit.FileName);
 					results.Add(res);

src/Main/Base/Project/Src/TextEditor/Commands/ParserBookmarkMenuBuilderBase.cs

@@ -51,7 +51,7 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Commands
 			if (cu != null) {
 				string fileName = cu.FileName;
 				if (fileName != null) {
-					if (member.Region != null && member.Region.BeginLine > 0) {
+					if (!member.Region.IsEmpty) {
 						viewContent = FileService.JumpToFilePosition(fileName, member.Region.BeginLine - 1, member.Region.BeginColumn - 1);
 					} else {
 						FileService.OpenFile(fileName);
@@ -69,7 +69,7 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Commands
 			if (cu != null) {
 				string fileName = cu.FileName;
 				if (fileName != null) {
-					if (member.Region != null && member.Region.EndLine > 0) {
+					if (!member.Region.IsEmpty) {
 						viewContent = FileService.JumpToFilePosition(fileName, member.Region.EndLine, 0);
 					} else {
 						FileService.OpenFile(fileName);

src/Main/Base/Project/Src/TextEditor/Gui/Dialogs/GotoDialog.cs

@@ -341,9 +341,9 @@ namespace ICSharpCode.SharpDevelop.Gui
 			Close();
 		}
 		
-		void GotoRegion(IRegion region, string fileName)
+		void GotoRegion(DomRegion region, string fileName)
 		{
-			if (fileName != null && region != null) {
+			if (fileName != null && !region.IsEmpty) {
 				FileService.JumpToFilePosition(fileName, region.BeginLine - 1, region.BeginColumn - 1);
 			}
 		}

src/Main/Base/Project/Src/TextEditor/Gui/Editor/CompletionWindow/CommentCompletionDataProvider.cs

@@ -55,7 +55,7 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 		/// <remarks>
 		/// Returns true, if the given coordinates (row, column) are in the region.
 		/// </remarks>
-		bool IsBetween(int row, int column, IRegion region)
+		bool IsBetween(int row, int column, DomRegion region)
 		{
 			return row >= region.BeginLine && (row <= region.EndLine || region.EndLine == -1);
 		}

src/Main/Base/Project/Src/TextEditor/Gui/Editor/ParserFoldingStrategy.cs

@@ -22,7 +22,7 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 			if (c.ClassType == ClassType.Delegate) {
 				return;
 			}
-			if (c.Region != null && c.Region.BeginLine < c.Region.EndLine) {
+			if (c.Region.BeginLine < c.Region.EndLine) {
 				FoldMarker newFoldMarker = new FoldMarker(document, c.Region.BeginLine - 1, c.Region.BeginColumn - 1,
 				                               c.Region.EndLine - 1, c.Region.EndColumn, FoldType.TypeBody);
 				if (newFoldMarker.Length > 0) {
@@ -34,22 +34,22 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 			}
 			
 			foreach (IMethod m in c.Methods) {
-				if (m.BodyRegion != null && m.Region.EndLine < m.BodyRegion.EndLine) {
+				if (m.Region.EndLine < m.BodyRegion.EndLine) {
 					foldMarkers.Add(new FoldMarker(document, m.Region.EndLine - 1, m.Region.EndColumn - 1,
 					                               m.BodyRegion.EndLine - 1, m.BodyRegion.EndColumn - 1, FoldType.MemberBody));
 				}
 			}
 			
 			foreach (IProperty p in c.Properties) {
-				if (p.BodyRegion != null && p.Region.EndLine < p.BodyRegion.EndLine) {
+				if (p.Region.EndLine < p.BodyRegion.EndLine) {
 					foldMarkers.Add(new FoldMarker(document, p.Region.EndLine - 1, p.Region.EndColumn - 1,
 					                               p.BodyRegion.EndLine- 1, p.BodyRegion.EndColumn - 1, FoldType.MemberBody));
 				}
 			}
 			
 			foreach (IEvent evt in c.Events) {
-				if (evt.BodyRegion != null && evt.Region.EndLine < evt.BodyRegion.EndLine) {
-					if (evt.BodyRegion != null) {
+				if (evt.Region.EndLine < evt.BodyRegion.EndLine) {
+					if (!evt.BodyRegion.IsEmpty) {
 						foldMarkers.Add(new FoldMarker(document, evt.Region.EndLine - 1, evt.Region.EndColumn - 1,
 						                               evt.BodyRegion.EndLine- 1, evt.BodyRegion.EndColumn - 1, FoldType.MemberBody));
 					}

src/Main/Base/Project/Src/TextEditor/Gui/Editor/QuickClassBrowserPanel.cs

@@ -51,7 +51,7 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 				}
 			}
 			
-			public IRegion ItemRegion {
+			public DomRegion ItemRegion {
 				get {
 					IClass classItem = item as IClass;
 					if (item is IClass)
@@ -59,14 +59,14 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 					else if (item is IMember)
 						return ((IMember)item).Region;
 					else
-						return null;
+						return DomRegion.Empty;
 				}
 			}
 			
 			public int Line {
 				get {
-					IRegion r = this.ItemRegion;
-					if (r == null)
+					DomRegion r = this.ItemRegion;
+					if (r.IsEmpty)
 						return 0;
 					else
 						return r.BeginLine - 1;
@@ -75,8 +75,8 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 			
 			public int Column {
 				get {
-					IRegion r = this.ItemRegion;
-					if (r == null)
+					DomRegion r = this.ItemRegion;
+					if (r.IsEmpty)
 						return 0;
 					else
 						return r.BeginColumn - 1;
@@ -85,8 +85,8 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 			
 			public int EndLine {
 				get {
-					IRegion r = this.ItemRegion;
-					if (r == null)
+					DomRegion r = this.ItemRegion;
+					if (r.IsEmpty)
 						return 0;
 					else
 						return r.EndLine - 1;
@@ -107,14 +107,14 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 					return false;
 				IClass classItem = item as IClass;
 				if (classItem != null) {
-					if (classItem.Region == null)
+					if (classItem.Region.IsEmpty)
 						return false;
 					return classItem.Region.BeginLine - 1 <= lineNumber &&
 						classItem.Region.EndLine - 1 >= lineNumber;
 				}
 				
 				IMember member = item as IMember;
-				if (member == null || member.Region == null) {
+				if (member == null || member.Region.IsEmpty) {
 					return false;
 				}
 				bool isInside = member.Region.BeginLine - 1 <= lineNumber;

src/Main/Base/Project/Src/TextEditor/Gui/Editor/TextEditorDisplayBinding.cs

@@ -465,26 +465,26 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 		
 		void AddClassMemberBookmarks(BookmarkManager bm, IClass c)
 		{
-			if (c.Region != null && c.Region.BeginLine > 0) {
+			if (!c.Region.IsEmpty) {
 				bm.AddMark(new Bookmarks.ClassBookmark(textAreaControl.Document, c));
 			}
 			foreach (IClass innerClass in c.InnerClasses) {
 				AddClassMemberBookmarks(bm, innerClass);
 			}
 			foreach (IMethod m in c.Methods) {
-				if (m.Region == null || m.Region.BeginLine <= 0) continue;
+				if (m.Region.IsEmpty) continue;
 				bm.AddMark(new Bookmarks.MethodBookmark(textAreaControl.Document, m));
 			}
 			foreach (IProperty m in c.Properties) {
-				if (m.Region == null || m.Region.BeginLine <= 0) continue;
+				if (m.Region.IsEmpty) continue;
 				bm.AddMark(new Bookmarks.PropertyBookmark(textAreaControl.Document, m));
 			}
 			foreach (IField f in c.Fields) {
-				if (f.Region == null || f.Region.BeginLine <= 0) continue;
+				if (f.Region.IsEmpty) continue;
 				bm.AddMark(new Bookmarks.FieldBookmark(textAreaControl.Document, f));
 			}
 			foreach (IEvent e in c.Events) {
-				if (e.Region == null || e.Region.BeginLine <= 0) continue;
+				if (e.Region.IsEmpty) continue;
 				bm.AddMark(new Bookmarks.EventBookmark(textAreaControl.Document, e));
 			}
 		}

src/Main/Base/Test/ReflectionLayerTests.cs

@@ -1,4 +1,4 @@
-// <file>
+// <file>
 //     <copyright see="prj:///doc/copyright.txt">2002-2005 AlphaSierraPapa</copyright>
 //     <license see="prj:///doc/license.txt">GNU General Public License</license>
 //     <owner name="Daniel Grunwald" email="daniel@danielgrunwald.de"/>
@@ -44,8 +44,8 @@ namespace ICSharpCode.SharpDevelop.Tests
 		[Test]
 		public void ParameterComparisonTest()
 		{
-			DefaultParameter p1 = new DefaultParameter("a", pc.GetClass("System.String").DefaultReturnType, null);
-			DefaultParameter p2 = new DefaultParameter("b", new GetClassReturnType(pc, "System.String"), null);
+			DefaultParameter p1 = new DefaultParameter("a", pc.GetClass("System.String").DefaultReturnType, DomRegion.Empty);
+			DefaultParameter p2 = new DefaultParameter("b", new GetClassReturnType(pc, "System.String"), DomRegion.Empty);
 			List<IParameter> a1 = new List<IParameter>();
 			List<IParameter> a2 = new List<IParameter>();
 			a1.Add(p1);