Compiler Error CS0071

An explicit interface implementation of an event must use event accessor syntax

When explicitly implementing an event that was declared in an interface, you must use manually provide the add and remove event accessors that are typically provided by the compiler. The accessor code can connect the interface event to another event in your class (shown later in this topic), or to its own delegate type. For more information, see How to: Implement Interface Events (C# Programming Guide).

Example

The following sample generates CS0071.

// CS0071.cs
public delegate void MyEvent(object sender);

interface ITest
{
    event MyEvent Clicked;
}

class Test : Itest
{
    event MyEvent ITest.Clicked;  // CS0071

    // try the following code instead
/*
private MyEvent clicked;

    event MyEvent Itest.Clicked
    {
        add
        {
            clicked += value;
        }
        remove
        {
            clicked -= value;
        }
    }
*/
    public static void Main() { }
}