Question

This is a contrived example:

public static class MyExtensions
{
  public static void MyMethod( this MyInterface obj, string txt )
  {
  }
}

interface MyInterface {}

public MyDerived : MyInterface
{
  void DoStuff()
  {
    MyMethod( "test" ); // fails; compiler can't find MyMethod?
  }
}

In my example above, I’m trying to call an extension method assigned to an interface from my derived class. The compiler fails here and says that MyMethod does not exist in the current context. I have all the appropriate using statements in my CS file, so I’m not sure what is going on.

Answer 1

Try invoking it like this:

this.MyMethod("test");