Remove the useless GeneratePInvokeMethod method.

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -306,9 +306,7 @@ namespace CppSharp.Generators.CSharp
                     continue;
 
                 NewLineIfNeeded();
-
-                GeneratePInvokeMethod(ctor, @class);
-                NeedNewLine();
+                GenerateFunction(ctor, @class);
             }
 
             foreach (var method in @class.Methods)
@@ -323,9 +321,7 @@ namespace CppSharp.Generators.CSharp
                     continue;
 
                 NewLineIfNeeded();
-
-                GeneratePInvokeMethod(method, @class);
-                NeedNewLine();
+                GenerateFunction(method, @class);
             }
 
             WriteCloseBraceIndent();
@@ -334,11 +330,6 @@ namespace CppSharp.Generators.CSharp
             typePrinter.PopContext();
         }
 
-        private void GeneratePInvokeMethod(Method method, Class @class)
-        {
-            GenerateFunction(method, @class);
-        }
-
         private void GenerateStructMarshaling(Class @class)
         {
             GenerateStructMarshalingFields(@class);