fix #220: Cannot rename an identifier starting with an @

src/AddIns/BackendBindings/CSharpBinding/Project/Src/Refactoring/CSharpCodeGenerator.cs

@@ -211,5 +211,10 @@ namespace CSharpBinding.Refactoring
 				script.ChangeModifier(entityDeclaration, entityDeclaration.Modifiers | Modifiers.Virtual);
 			}
 		}
+		
+		public override string EscapeIdentifier(string identifier)
+		{
+			return "@" + identifier;
+		}
 	}
 }

src/Main/Base/Project/Refactoring/CodeGenerator.cs

@@ -83,6 +83,11 @@ namespace ICSharpCode.SharpDevelop.Refactoring
 				return newName;
 		}
 		
+		public virtual string EscapeIdentifier(string identifier)
+		{
+			throw new NotSupportedException("Feature not supported!");
+		}
+		
 		public virtual void AddField(ITypeDefinition declaringType, Accessibility accessibility, IType fieldType, string name)
 		{
 			throw new NotSupportedException("Feature not supported!");

src/Main/Base/Project/Src/Editor/Commands/FindReferencesCommand.cs

@@ -126,7 +126,8 @@ namespace ICSharpCode.SharpDevelop.Editor.Commands
 			if (string.IsNullOrEmpty(name))
 				return false;
 
-			if ((language.CodeDomProvider == null) || !language.CodeDomProvider.IsValidIdentifier(name))
+			if ((language.CodeDomProvider == null) || (!language.CodeDomProvider.IsValidIdentifier(name) &&
+			                                           !language.CodeDomProvider.IsValidIdentifier(language.CodeGenerator.EscapeIdentifier(name))))
 				return false;
 			
 			return true;