Question

I wrote some class:

public class A 
{
    public A()
    {
        serviceAdapter.CompletedCallBackEvent += new EventHandler( foo );
        .
        .
        .
    }

    void foo(object sender, EventArgs e)
    {
        serviceAdapter.CompletedCallBackEvent -= new EventHandler( foo );
    }
}

Now, i want to change this callback listener with some anonymous – but i don’t know how to remove the callback listener in the anonymous method .

class A
{
    public A()
    {
            serviceAdapter.CompletedCallBackEvent += delegate( object sender, EventArgs ee )
            {
                  ... need to remove the listener to the event. 
            }
    }
}

Answer 1

You could simply assign your delegate/handler to a private variable.

private EventHander _handler = null;

public A()
{        
    _handler = delegate( object sender, EventArgs ee)
        {          
            ServiceAdapter.CompletedCallBackEvent -= _handler;
        };
    ServiceAdapter.CompletedCallBackEvent += _handler;
}