Question

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.ContextMenuClickHandler += 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?

Answer 1

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?