Why events can't be used in the same way in derived classes as in the base class in C#?

Question

In following code, I want to extend the behaviour of a class by deriving/subclassing it, and make use of an event of the base class:

public class A
{
    pub         


        

Answer 1

Todd's answer is correct. Often you will see this implemented throughout the .NET framework as OnXXX(EventArgs) methods:

public class Foo
{
    public event EventHandler Click;

    protected virtual void OnClick(EventArgs e)
    {
        var click = Click;
        if (click != null)
            click(this, e);
    }
}

I strongly encourage you to consider the EventArgs/EventHandler pattern before you find yourself making all manner of CustomEventArgs/CustomEventHandler for raising events.