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Compiler Error CS0629

Conditional member 'member' cannot implement interface member 'base class member'

The Conditional attribute cannot be used on the implementation of an interface.

The following sample generates CS0629:

// CS0629.cs
interface MyInterface
{
   void MyMethod();
}

public class MyClass : MyInterface
{
   [System.Diagnostics.Conditional("debug")]
   public void MyMethod()    // CS0629, remove the Conditional attribute
   {
   }

   public static void Main()
   {
   }
}
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