GenerateClassFields is now always called even when the current class has no fields because fields of a value type base class must generated.

src/Generator/Generators/CLI/CLIHeadersTemplate.cs

@@ -269,16 +269,15 @@ namespace CppSharp.Generators.CLI
 
             GenerateClassVariables(@class);
 
-            if (@class.Fields.Any())
-            {
             PushBlock(CLIBlockKind.AccessSpecifier);
             WriteLine("private:");
-                PopBlock(NewLineKind.IfNotEmpty);
+            var accBlock = PopBlock(NewLineKind.IfNotEmpty);
 
             PushBlock(CLIBlockKind.Fields);
             GenerateClassFields(@class);   
-                PopBlock();
-            }
+            var fieldsBlock = PopBlock();
+
+            accBlock.CheckGenerate = () => !fieldsBlock.IsEmpty;
 
             WriteLine("};");
         }