CheckIgnoreField now properly handles internal fields.

src/Generator/AST/Utils.cs

@@ -60,15 +60,15 @@ namespace CppSharp.AST
             return false;
         }
 
-        public static bool CheckIgnoreField(Field field)
+        public static bool CheckIgnoreField(Field field, bool useInternals = false)
         {
             if (field.Access == AccessSpecifier.Private) 
                 return true;
 
             if (field.Class.IsValueType && field.IsDeclared)
-                return false;
-
-            return !field.IsGenerated;
+                return false;
+
+            return !field.IsGenerated && (!useInternals || !field.IsInternal);
         }
 
         public static bool CheckIgnoreProperty(Property prop)

src/Generator/Generators/CSharp/CSharpTextTemplate.cs

@@ -222,7 +222,7 @@ namespace CppSharp.Generators.CSharp
 
                 // Generate all the internal function declarations.
                 foreach (var function in context.Functions)
-                {
+                {
                     if (!function.IsInternal) continue;
 
                     GenerateInternalFunction(function);
@@ -760,8 +760,8 @@ namespace CppSharp.Generators.CSharp
             }
 
             foreach (var field in @class.Fields)
-            {
-                if (!nativeFields && ASTUtils.CheckIgnoreField(field)) continue;
+            {
+                if (ASTUtils.CheckIgnoreField(field, nativeFields)) continue;
                 action(field);
             }
         }