C# Error
CS0730 – Cannot forward type ‘{0}’ because it is a nested type of ‘{1}’
Reason for the Error & Solution
Cannot forward type ‘type’ because it is a nested type of ‘type’
This error is generated when you try to forward a nested class.
Example
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
