allow method execution in Console Pad, Conditional Breakpoints, Watch Pad and sub-tree nodes

src/AddIns/Debugger/Debugger.AddIn/NRefactory/ExpressionEvaluationVisitor.cs

@@ -326,6 +326,8 @@ namespace Debugger.AddIn
 		
 		Value Visit(ConversionResolveResult result)
 		{
+			if (result.IsError)
+				throw new GetValueException("Cannot convert from '{0}' to '{1}'.", new CSharpAmbience().ConvertType(result.Input.Type), new CSharpAmbience().ConvertType(result.Type));
 			var val = Convert(result.Input);
 			if (result.Conversion.IsBoxingConversion)
 				return val;

src/AddIns/Debugger/Debugger.AddIn/Service/WindowsDebugger.cs

@@ -584,7 +584,7 @@ namespace ICSharpCode.SharpDevelop.Services
 			var location = CurrentStackFrame.NextStatement;
 			var fileName = new FileName(location.Filename);
 			var rr = SD.ParserService.ResolveSnippet(fileName, new TextLocation(location.StartLine, location.StartColumn), new ParseableFileContentFinder().Create(fileName), code, null, System.Threading.CancellationToken.None);
-			return new ExpressionEvaluationVisitor(CurrentStackFrame, EvalThread, CurrentStackFrame.AppDomain.Compilation).Convert(rr);
+			return new ExpressionEvaluationVisitor(CurrentStackFrame, EvalThread, CurrentStackFrame.AppDomain.Compilation, true).Convert(rr);
 		}
 
 		public void JumpToCurrentLine()

src/AddIns/Debugger/Debugger.Core/Value.cs

@@ -61,7 +61,8 @@ namespace Debugger
 		[Debugger.Tests.Ignore]
 		public ICorDebugReferenceValue CorReferenceValue {
 			get {
-				if (IsNull) throw new GetValueException("Value is null");
+				if (IsNull)
+					throw new GetValueException("Value is null");
 				
 				if (!(this.CorValue is ICorDebugReferenceValue))
 					throw new DebuggerException("Reference value expected");
@@ -73,7 +74,8 @@ namespace Debugger
 		[Debugger.Tests.Ignore]
 		public ICorDebugGenericValue CorGenericValue {
 			get {
-				if (IsNull) throw new GetValueException("Value is null");
+				if (IsNull)
+					throw new GetValueException("Value is null");
 				
 				ICorDebugValue corValue = this.CorValue;
 				// Dereference and unbox if necessary
@@ -90,7 +92,8 @@ namespace Debugger
 		[Debugger.Tests.Ignore]
 		public ICorDebugArrayValue CorArrayValue {
 			get {
-				if (IsNull) throw new GetValueException("Value is null");
+				if (IsNull)
+					throw new GetValueException("Value is null");
 				
 				if (this.Type.Kind != TypeKind.Array) throw new DebuggerException("Value is not an array");
 				
@@ -101,7 +104,8 @@ namespace Debugger
 		[Debugger.Tests.Ignore]
 		public ICorDebugObjectValue CorObjectValue {
 			get {
-				if (IsNull) throw new GetValueException("Value is null");
+				if (IsNull)
+					throw new GetValueException("Value is null");
 				
 				ICorDebugValue corValue = this.CorValue;
 				// Dereference and unbox if necessary