Added support for IsOverride in the generators.

src/Generator/Generators/CLI/CLIHeadersTemplate.cs

@@ -522,6 +522,9 @@ namespace CppSharp.Generators.CLI
 
             GenerateDeclarationCommon(method);
 
+            if (method.IsOverride)
+                Write("virtual ");
+
             if (method.IsStatic)
                 Write("static ");
 
@@ -532,7 +535,12 @@ namespace CppSharp.Generators.CLI
 
             GenerateMethodParameters(method);
 
-            WriteLine(");");
+            Write(")");
+
+            if (method.IsOverride)
+                Write(" override");
+
+            WriteLine(";");
 
             PopBlock();
         }

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -1145,6 +1145,9 @@ namespace CppSharp.Generators.CSharp
             if (method.IsStatic || (method.IsOperator && isBuiltinOperator))
                 Write("static ");
 
+            if (method.IsOverride)
+                Write("override ");
+
             var functionName = GetFunctionIdentifier(method);
 
             if (method.IsConstructor || method.IsDestructor)