Fixed NullReferenceException in MethodInsightDataProvider.

Code converter: when an identifier cannot be resolved, don't assume it's a method.

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/branches/3.0@3692 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Main/Base/Project/Src/TextEditor/Gui/Editor/InsightWindow/MethodInsightDataProvider.cs

@@ -8,6 +8,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Linq;
 
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Dom;
@@ -127,6 +128,8 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 			}
 			
 			ResolveResult results = ParserService.Resolve(expressionResult, caretLineNumber, caretColumn, fileName, document.TextContent);
+			if (results == null)
+				return;
 			LanguageProperties language = ParserService.CurrentProjectContent.Language;
 			TypeResolveResult trr = results as TypeResolveResult;
 			if (trr == null && language.AllowObjectConstructionOutsideContext) {
@@ -138,22 +141,14 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 					constructorInsight = true;
 			}
 			if (constructorInsight) {
-				if (trr == null) {
-					if ((expressionResult.Expression == "this") && (expressionResult.Context == ExpressionContext.BaseConstructorCall)) {
+				if (trr != null || expressionResult.Context == ExpressionContext.BaseConstructorCall) {
+					if (results.ResolvedType != null) {
 						methods.AddRange(GetConstructorMethods(results.ResolvedType.GetMethods()));
-					}
-					
-					if ((expressionResult.Expression == "base") && (expressionResult.Context == ExpressionContext.BaseConstructorCall)) {
-						if (results.CallingClass.BaseType.DotNetName == "System.Object")
-							return;
-						methods.AddRange(GetConstructorMethods(results.CallingClass.BaseType.GetMethods()));
-					}
-				} else {
-					methods.AddRange(GetConstructorMethods(trr.ResolvedType.GetMethods()));
-					
-					if (methods.Count == 0 && trr.ResolvedClass != null && !trr.ResolvedClass.IsAbstract && !trr.ResolvedClass.IsStatic) {
-						// add default constructor
-						methods.Add(Constructor.CreateDefault(trr.ResolvedClass));
+						IClass resolvedClass = (trr != null) ? trr.ResolvedClass : results.ResolvedType.GetUnderlyingClass();
+						if (methods.Count == 0 && resolvedClass != null && !resolvedClass.IsStatic) {
+							// add default constructor
+							methods.Add(Constructor.CreateDefault(resolvedClass));
+						}
 					}
 				}
 			} else {
@@ -189,15 +184,11 @@ namespace ICSharpCode.SharpDevelop.DefaultEditor.Gui.Editor
 			}
 		}
 		
-		List<IMethodOrProperty> GetConstructorMethods(List<IMethod> methods)
+		IEnumerable<IMethodOrProperty> GetConstructorMethods(List<IMethod> methods)
 		{
-			List<IMethodOrProperty> constructorMethods = new List<IMethodOrProperty>();
-			foreach (IMethod method in methods) {
-				if (method.IsConstructor && !method.IsStatic) {
-					constructorMethods.Add(method);
-				}
-			}
-			return constructorMethods;
+			return from method in methods
+				where method.IsConstructor && !method.IsStatic
+				select (IMethodOrProperty)method;
 		}
 		
 		public bool CaretOffsetChanged()

src/Main/ICSharpCode.SharpDevelop.Dom/Project/Src/NRefactoryResolver/VBNetToCSharpConvertVisitor.cs

@@ -7,6 +7,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using ICSharpCode.NRefactory;
 using ICSharpCode.NRefactory.Ast;
 using ICSharpCode.NRefactory.AstBuilder;
@@ -383,7 +384,11 @@ namespace ICSharpCode.SharpDevelop.Dom.NRefactoryResolver
 		
 		bool ReplaceWithInvocation(Expression expression, ResolveResult rr)
 		{
-			if (rr is MethodGroupResolveResult
+			// replace with invocation if rr is a method
+			// and were not taking the address and it's not already being invoked
+			MethodGroupResolveResult mgrr = rr as MethodGroupResolveResult;
+			if (mgrr != null
+			    && mgrr.Methods.Any(g=>g.Count>0)
 			    && !(expression.Parent is AddressOfExpression)
 			    && !(NRefactoryResolver.IsInvoked(expression)))
 			{