How to remove the event from the event delegate list of events

     The other day a colleague asked me how to remove all delegate from the Click event of a Button, I thought for a moment you can do it this way:

public   void  RemoveEvent(Control c)
{
    PropertyInfo propertyInfo  =  ( typeof (System.Windows.Forms.Button)).GetProperty( " Events " , BindingFlags.Instance  |  BindingFlags.NonPublic);
    EventHandlerList eventHandlerList  =  (EventHandlerList)propertyInfo.GetValue(c,  null );
    FieldInfo fieldInfo  =  ( typeof (Control)).GetField( " EventClick " , BindingFlags.Static  |  BindingFlags.NonPublic);
    Delegate d  =  eventHandlerList[fieldInfo.GetValue( null )];
     if  (d  !=   null )
    {
         foreach  (Delegate temp  in  d.GetInvocationList())
        {

            c.Click  -=  (EventHandler)temp;
        }
     } 
}

 

 

      The basic principle is done by reflection, processed to obtain a list of fields and then commissioned ( (EventHandlerList) propertyInfo.GetValue (c, null) can get the delegate list ), the following information can be seen by Reflector: 

 

     

Reproduced in: https: //www.cnblogs.com/vivounicorn/archive/2009/06/24/1510328.html