Compiler Error CS0730
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Compiler Error CS0730

Cannot forward type 'type' because it is a nested type of 'type'

This error is generated when you try to forward a nested class.

The following sample generates CS0730. It consists of two source files. First, compile the library file CS0730a.cs, and the compile the file CS0730.cs referencing the library file.

// CS0730a.cs
// compile with: /t:library
public class Outer
   public class Nested {}
// CS0730.cs
// compile with: /t:library /r:CS0730a.dll
using System.Runtime.CompilerServices;

[assembly:TypeForwardedToAttribute(typeof(Outer.Nested))]   // CS0730

[assembly:TypeForwardedToAttribute(typeof(Outer))]   // OK
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