Fixed NullReferenceException when converting C# statements like "if (a != null) b.c();"

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@991 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/Libraries/NRefactory/Project/Src/Parser/Visitors/CSharpConstructsVisitor.cs

@@ -101,7 +101,10 @@ namespace ICSharpCode.NRefactory.Parser
 				}
 				if (ident != null && se != null) {
 					InvocationExpression ie = se.Expression as InvocationExpression;
-					if (ie != null && (ie.TargetObject as IdentifierExpression).Identifier == ident.Identifier) {
+					if (ie != null &&
+					    ie.TargetObject is IdentifierExpression &&
+					    (ie.TargetObject as IdentifierExpression).Identifier == ident.Identifier)
+					{
 						ReplaceCurrentNode(new RaiseEventStatement(ident.Identifier, ie.Arguments));
 					}
 				}

src/Libraries/NRefactory/Test/Output/VBNet/CSharpToVBConverterTest.cs

@@ -124,6 +124,29 @@ namespace ICSharpCode.NRefactory.Tests.PrettyPrinter
 			              "RaiseEvent MyEvent(Me, EventArgs.Empty)");
 		}
 		
+		[Test]
+		public void IfStatementSimilarToRaiseEvent()
+		{
+			TestStatement("if (FullImage != null) DrawImage();",
+			              "If FullImage IsNot Nothing Then\n" +
+			              "\tDrawImage()\n" +
+			              "End If");
+			// regression test:
+			TestStatement("if (FullImage != null) e.DrawImage();",
+			              "If FullImage IsNot Nothing Then\n" +
+			              "\te.DrawImage()\n" +
+			              "End If");
+			// with braces:
+			TestStatement("if (FullImage != null) { DrawImage(); }",
+			              "If FullImage IsNot Nothing Then\n" +
+			              "\tDrawImage()\n" +
+			              "End If");
+			TestStatement("if (FullImage != null) { e.DrawImage(); }",
+			              "If FullImage IsNot Nothing Then\n" +
+			              "\te.DrawImage()\n" +
+			              "End If");
+		}
+		
 		[Test]
 		public void AnonymousMethod()
 		{