Is it possible to create an event in an abstract class?

I have abstract class

public abstract class BaseClass
{
    public delegate void ContextMenuClickHandler(object sender, Point point);
    public event ContextMenuClickHandler OnContextMenuClick;

    public void OnMouseClick(MouseEventArgs e)
    {
        OnContextMenuClick(this, new Point((int) x, (int) y));
    }
}

and I plug event:

Base.ContextMenuClickHa开发者_开发百科ndler += ShowContextMenu;//error

void ShowContextMenu(object sender, Point point)
{

}

error:

'Base.ContextMenuClickHandler' is a 'type', which is not valid in the given context

How to fix it?

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The problem here is you are using the event type, ContextMenuClickHandler, instead of the event name, OnContextMenuClick. Try the following

base.OnContextMenuClick += ShowContextMenu

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OnContextMenuClick += ShowContextMenu;//fix

you used the wrong variable. OnContextMenuClick is your event that you subscribe to.

but in your case, why do not use a virtual method?

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There is an example here, have a look: http://msdn.microsoft.com/en-us/library/hy3sefw3.aspx