Compiler Error CS0540

'interface member' : containing type does not implement interface 'interface'

You attempted to implement an interface member in a class that does not derive from the interface. You should either delete the implementation of the interface member or add the interface to the base-class list of the class.

Example 1

The following sample generates CS0540.

// CS0540.cs  
interface I  
{  
   void m();  
}  
  
public class Clx  
{  
   void I.m() {}   // CS0540  
}  
  
// OK  
public class Cly : I  
{  
   void I.m() {}  
   public static void Main() {}  
}  

Example 2

The following sample generates CS0540.

// CS0540_b.cs  
using System;  
class C {  
   void IDisposable.Dispose() {}   // CS0540  
}  
  
class D : IDisposable {  
   void IDisposable.Dispose() {}  
   public void Dispose() {}  
  
   static void Main() {  
      using (D d = new D()) {}  
   }  
}