© { JSL }
105
Text Box: event Delegates
event Delegates
Folded Corner:
·a delegate field can be marked as an event
wonly += and -= can be performed on the field
wused widely in GUI classes
namespace System.Windows.Forms
{
    public class Button : ...
    { 
        ...
        public event EventHandler Click;
        ...
        ...
        protected void OnClick(EventArgs e)
        {
            if (Click != null)
            {
                Click(this, e);
            }
        }
        ...
    }
}