Applied some of the optimizations suggested by Kris Vandermotten. #150

ICSharpCode.NRefactory/CSharp/Ast/ComposedType.cs

@@ -52,7 +52,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		
 		public int PointerRank {
 			get {
-				return GetChildrenByRole(PointerRole).Count();
+				return GetChildrenByRole(PointerRole).Count;
 			}
 			set {
 				if (value < 0)
@@ -141,7 +141,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		}
 		
 		public int Dimensions {
-			get { return 1 + GetChildrenByRole(Roles.Comma).Count(); }
+			get { return 1 + GetChildrenByRole(Roles.Comma).Count; }
 			set {
 				int d = this.Dimensions;
 				while (d > value) {

ICSharpCode.NRefactory/CSharp/Ast/Identifier.cs

@@ -96,7 +96,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		{
 			if (name == null)
 				throw new ArgumentNullException("name");
-			IsVerbatim = name.StartsWith ("@");
+			IsVerbatim = name.Length > 0 && name[0] == '@';
 			this.Name = IsVerbatim ? name.Substring (1) : name;
 			this.startLocation = location;
 		}

ICSharpCode.NRefactory/CSharp/Parser/TypeSystemConvertVisitor.cs

@@ -263,7 +263,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		#region Fields
 		public override IEntity VisitFieldDeclaration(FieldDeclaration fieldDeclaration, object data)
 		{
-			bool isSingleField = fieldDeclaration.Variables.Count() == 1;
+			bool isSingleField = fieldDeclaration.Variables.Count == 1;
 			Modifiers modifiers = fieldDeclaration.Modifiers;
 			DefaultField field = null;
 			foreach (VariableInitializer vi in fieldDeclaration.Variables) {
@@ -476,7 +476,7 @@ namespace ICSharpCode.NRefactory.CSharp
 		#region Events
 		public override IEntity VisitEventDeclaration(EventDeclaration eventDeclaration, object data)
 		{
-			bool isSingleEvent = eventDeclaration.Variables.Count() == 1;
+			bool isSingleEvent = eventDeclaration.Variables.Count == 1;
 			Modifiers modifiers = eventDeclaration.Modifiers;
 			DefaultEvent ev = null;
 			foreach (VariableInitializer vi in eventDeclaration.Variables) {

ICSharpCode.NRefactory/CSharp/Resolver/ResolveVisitor.cs

@@ -241,7 +241,7 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 		
 		ResolveResult VisitFieldOrEventDeclaration(AttributedNode fieldOrEventDeclaration)
 		{
-			int initializerCount = fieldOrEventDeclaration.GetChildrenByRole(FieldDeclaration.Roles.Variable).Count();
+			int initializerCount = fieldOrEventDeclaration.GetChildrenByRole(FieldDeclaration.Roles.Variable).Count;
 			ResolveResult result = null;
 			for (AstNode node = fieldOrEventDeclaration.FirstChild; node != null; node = node.NextSibling) {
 				if (node.Role == FieldDeclaration.Roles.Variable) {
@@ -939,7 +939,7 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 			                                        firstInitializer != null ? firstInitializer.Initializer : null,
 			                                        false);
 			
-			int initializerCount = variableDeclarationStatement.Variables.Count();
+			int initializerCount = variableDeclarationStatement.Variables.Count;
 			ResolveResult result = null;
 			for (AstNode node = variableDeclarationStatement.FirstChild; node != null; node = node.NextSibling) {
 				if (node.Role == FieldDeclaration.Roles.Variable) {