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Compiler Error CS0570 

Error Message

'class' is not supported by the language

This error occurs when using imported metadata that was generated by another compiler. Your code attempted to use a class member that the compiler cannot process.

Example

The following C++ program uses an attribute, RequiredAttributeAttribute, which may not be consumed by other languages.

// CPP0570.cpp
// compile with: /clr /LD

using namespace System;
using namespace System::Runtime::CompilerServices;

namespace CS0570_Server {
   [RequiredAttributeAttribute(Int32::typeid)]  
   public ref struct Scenario1 {
      int intVar;
   };

   public ref struct CS0570Class {
      Scenario1 ^ sc1_field;

      property virtual Scenario1 ^ sc1_prop {
         Scenario1 ^ get() { return sc1_field; }
      }

      Scenario1 ^ sc1_method() { return sc1_field; }
   };
};

The following sample generates CS0570.

// CS0570.cs
// compile with: /reference:CPP0570.dll
using System;
using CS0570_Server;

public class C {
   public static int Main() {
      CS0570Class r = new CS0570Class();
      r.sc1_field = null;   // CS0570
      object o = r.sc1_prop;   // CS0570
      r.sc1_method();   // CS0570
   }
}

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