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

Wrap it with a protected virtual On... method:

public class BaseClass
{
    public event EventHandler SomeEvent;

    protected virtual void OnSomeEvent()
    {
        if(SomeEvent!= null)
            SomeEvent(this, new MyArgs(...) );
    }
}

Then override this in a derived class

public class DerivedClass : BaseClass
{
    protected override void OnSomeEvent()
    {
        //do something

        base.OnSomeEvent();
    }
}

You'll set this pattern all over .Net - all form and web controls follow it.

Do not use the prefix Raise... - this is not consistent with MS's standards and can cause confusion elsewhere.