Fixed thread-safety issue when accessing IProjectContent.ReferencedContents.

Fixes InvalidOperationException in XamlCompilationUnit.FindType (crash #240)

src/AddIns/BackendBindings/Python/PythonBinding/Project/Src/PythonResolverContext.cs

@@ -4,6 +4,8 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+
+using ICSharpCode.SharpDevelop;
 using ICSharpCode.SharpDevelop.Dom;
 
 namespace ICSharpCode.PythonBinding
@@ -118,7 +120,7 @@ namespace ICSharpCode.PythonBinding
 		
 		public bool PartialNamespaceExistsInProjectReferences(string name)
 		{
-			foreach (IProjectContent referencedContent in projectContent.ReferencedContents) {
+			foreach (IProjectContent referencedContent in projectContent.ThreadSafeGetReferencedContents()) {
 				if (PartialNamespaceExists(referencedContent, name)) {
 					return true;
 				}

src/AddIns/BackendBindings/VBNetBinding/Project/Src/OptionPanels/ProjectImports.cs

@@ -35,7 +35,7 @@ namespace ICSharpCode.VBNetBinding.OptionPanels
 			}
 			
 			IProjectContent projectContent = ParserService.GetProjectContent(project);
-			foreach(IProjectContent refProjectContent in projectContent.ReferencedContents) {
+			foreach(IProjectContent refProjectContent in projectContent.ThreadSafeGetReferencedContents()) {
 				AddNamespaces(refProjectContent);
 				
 			}

src/AddIns/BackendBindings/XamlBinding/XamlBinding/CompletionDataHelper.cs

@@ -311,7 +311,7 @@ namespace ICSharpCode.XamlBinding
 		{
 			List<XmlnsCompletionItem> list = new List<XmlnsCompletionItem>();
 			
-			foreach (IProjectContent content in projectContent.ReferencedContents) {
+			foreach (IProjectContent content in projectContent.ThreadSafeGetReferencedContents()) {
 				foreach (IAttribute att in content.GetAssemblyAttributes()) {
 					if (att.PositionalArguments.Count == 2
 					    && att.AttributeType.FullyQualifiedName == "System.Windows.Markup.XmlnsDefinitionAttribute") {

src/AddIns/BackendBindings/XamlBinding/XamlBinding/XamlCompilationUnit.cs

@@ -2,10 +2,12 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
-using System.Linq;
-using ICSharpCode.SharpDevelop.Dom;
 using System.Collections;
 using System.Collections.Generic;
+using System.Linq;
+
+using ICSharpCode.SharpDevelop;
+using ICSharpCode.SharpDevelop.Dom;
 
 namespace ICSharpCode.XamlBinding
 {
@@ -81,7 +83,7 @@ namespace ICSharpCode.XamlBinding
 				IReturnType type = FindTypeInAssembly(pc, xmlNamespace, className);
 				if (type != null)
 					return type;
-				foreach (IProjectContent p in pc.ReferencedContents) {
+				foreach (IProjectContent p in pc.ThreadSafeGetReferencedContents()) {
 					type = FindTypeInAssembly(p, xmlNamespace, className);
 					if (type != null)
 						return type;
@@ -117,7 +119,7 @@ namespace ICSharpCode.XamlBinding
 				else {
 					var list = new List<ICompletionEntry>();
 					AddNamespaceMembersInAssembly(pc, xmlNamespace, list);
-					foreach (IProjectContent p in pc.ReferencedContents) {
+					foreach (IProjectContent p in pc.ThreadSafeGetReferencedContents()) {
 						AddNamespaceMembersInAssembly(p, xmlNamespace, list);
 					}
 					return list.OfType<IClass>();

src/AddIns/DisplayBindings/FormsDesigner/Project/Src/Services/TypeResolutionService.cs

@@ -128,7 +128,7 @@ namespace ICSharpCode.FormsDesigner.Services
 			
 			try {
 				// load dependencies of current assembly
-				foreach (IProjectContent rpc in pc.ReferencedContents) {
+				foreach (IProjectContent rpc in pc.ThreadSafeGetReferencedContents()) {
 					if (rpc is ParseProjectContent) {
 						LoadAssembly(rpc);
 					} else if (rpc is ReflectionProjectContent) {

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.AddIn/Src/IdeChooseClassService.cs

@@ -43,7 +43,7 @@ namespace ICSharpCode.WpfDesign.AddIn
 			var pc = ParserService.CurrentProjectContent;
 			var a = GetAssembly(pc);
 			if (a != null) yield return a;
-			foreach (var r in pc.ReferencedContents) {
+			foreach (var r in pc.ThreadSafeGetReferencedContents()) {
 				a = GetAssembly(r);
 				if (a != null) yield return a;
 			}

src/AddIns/DisplayBindings/WpfDesign/WpfDesign.AddIn/Src/MyTypeFinder.cs

@@ -52,7 +52,7 @@ namespace ICSharpCode.WpfDesign.AddIn
 		
 		Assembly FindAssemblyInProjectReferences(IProjectContent pc, string name)
 		{
-			foreach (IProjectContent referencedProjectContent in pc.ReferencedContents) {
+			foreach (IProjectContent referencedProjectContent in pc.ThreadSafeGetReferencedContents()) {
 				if (name == referencedProjectContent.AssemblyName) {
 					return this.typeResolutionService.LoadAssembly(referencedProjectContent);
 				}

src/AddIns/Misc/SharpRefactoring/Project/Src/ContextActions/AddUsing.cs

@@ -48,7 +48,7 @@ namespace SharpRefactoring.ContextActions
 			IProjectContent pc = context.ProjectContent;
 			
 			SearchAllExtensionMethodsWithName(results, pc, rr.CallName);
-			foreach (IProjectContent content in pc.ReferencedContents)
+			foreach (IProjectContent content in pc.ThreadSafeGetReferencedContents())
 				SearchAllExtensionMethodsWithName(results, content, rr.CallName);
 			
 			foreach (IClass c in results) {
@@ -99,7 +99,7 @@ namespace SharpRefactoring.ContextActions
 		public string Search(UnknownMethodResolveResult rr, IProjectContent pc, List<IClass> results)
 		{
 			SearchAttributesWithName(results, pc, rr.CallName);
-			foreach (IProjectContent content in pc.ReferencedContents)
+			foreach (IProjectContent content in pc.ThreadSafeGetReferencedContents())
 				SearchAttributesWithName(results, content, rr.CallName);
 			return rr.CallName;
 		}
@@ -107,7 +107,7 @@ namespace SharpRefactoring.ContextActions
 		public string Search(UnknownIdentifierResolveResult rr, IProjectContent pc, List<IClass> results)
 		{
 			SearchAttributesWithName(results, pc, rr.Identifier);
-			foreach (IProjectContent content in pc.ReferencedContents)
+			foreach (IProjectContent content in pc.ThreadSafeGetReferencedContents())
 				SearchAttributesWithName(results, content, rr.Identifier);
 			return rr.Identifier;
 		}

src/AddIns/Misc/SharpRefactoring/Project/Src/MenuItemFactories/ResolveAttribute.cs

@@ -42,7 +42,7 @@ namespace SharpRefactoring
 				var rr = context.ResolveResult as UnknownMethodResolveResult;
 				SearchAttributesWithName(results, pc, rr.CallName);
 				
-				foreach (IProjectContent content in pc.ReferencedContents)
+				foreach (IProjectContent content in pc.ThreadSafeGetReferencedContents())
 					SearchAttributesWithName(results, content, rr.CallName);
 				
 				name = rr.CallName;
@@ -52,7 +52,7 @@ namespace SharpRefactoring
 				var rr = context.ResolveResult as UnknownIdentifierResolveResult;
 				SearchAttributesWithName(results, pc, rr.Identifier);
 				
-				foreach (IProjectContent content in pc.ReferencedContents)
+				foreach (IProjectContent content in pc.ThreadSafeGetReferencedContents())
 					SearchAttributesWithName(results, content, rr.Identifier);
 				
 				name = rr.Identifier;

src/AddIns/Misc/SharpRefactoring/Project/Src/MenuItemFactories/ResolveExtensionMethod.cs

@@ -38,7 +38,7 @@ namespace SharpRefactoring
 			
 			SearchAllExtensionMethodsWithName(results, context.ProjectContent, rr.CallName);
 			
-			foreach (IProjectContent content in context.ProjectContent.ReferencedContents)
+			foreach (IProjectContent content in context.ProjectContent.ThreadSafeGetReferencedContents())
 				SearchAllExtensionMethodsWithName(results, content, rr.CallName);
 			
 			if (!results.Any())

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

@@ -3,10 +3,12 @@
 
 using System;
 using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Dom;
 using ICSharpCode.SharpDevelop.Project;
-using System.IO;
 using RegistryContentPair = System.Collections.Generic.KeyValuePair<ICSharpCode.SharpDevelop.Dom.ProjectContentRegistry, ICSharpCode.SharpDevelop.Dom.IProjectContent>;
 
 namespace ICSharpCode.SharpDevelop
@@ -134,7 +136,7 @@ namespace ICSharpCode.SharpDevelop
 			foreach (ProjectContentRegistryDescriptor registry in registries) {
 				if (registry.IsRegistryLoaded) {
 					foreach (IProjectContent pc in registry.Registry.GetLoadedProjectContents()) {
-						if (pc.ReferencedContents.Contains(referencedContent)) {
+						if (pc.ThreadSafeGetReferencedContents().Contains(referencedContent)) {
 							if (unloadedReferenceContents.Add(pc)) {
 								LoggingService.Debug("Mark dependent content for unloading " + pc);
 								otherContentsToUnload.Add(new RegistryContentPair(registry.Registry, pc));
@@ -148,11 +150,13 @@ namespace ICSharpCode.SharpDevelop
 				IProject project = (IProject)pc.Project;
 				if (projectsToRefresh.Contains(project))
 					continue;
+				lock (pc.ReferencedContents) {
 					if (pc.ReferencedContents.Remove(referencedContent)) {
 						LoggingService.Debug("UnloadReferencedContent: Mark project for reparsing " + project.Name);
 						projectsToRefresh.Add(project);
 					}
 				}
+			}
 			
 			foreach (RegistryContentPair pair in otherContentsToUnload) {
 				UnloadReferencedContent(projectsToRefresh, unloadedReferenceContents, pair.Key, pair.Value);

src/Main/Base/Project/Src/Util/ExtensionMethods.cs

@@ -618,6 +618,13 @@ namespace ICSharpCode.SharpDevelop
 			return new Location(region.EndColumn, region.EndLine);
 		}
 		
+		public static IEnumerable<IProjectContent> ThreadSafeGetReferencedContents(this IProjectContent pc)
+		{
+			lock (pc.ReferencedContents) {
+				return pc.ReferencedContents.ToList();
+			}
+		}
+		
 		public static int PositionToOffset(this IDocument document, Location location)
 		{
 			return document.PositionToOffset(location.Line, location.Column);