C#インタフェースイベントテスト

  
    

   
     using
   
      System;

   
     using
   
      System.Collections.Generic;

   
     using
   
      System.Text;


   
     namespace
   
      ImplementInterfaceEvents
{
 
   
     interface
   
      IDrawingObject
 {
 
   
     event
   
      EventHandler ShapeChanged;
 }

 
   
     public
   
      
   
     class
   
      MyEventArgs : EventArgs
 {
 
   
     private
   
      
   
     string
   
      dispalyMsg;

 
   
     public
   
      
   
     string
   
      DispalyMsg
 {
 
   
     get
   
      { 
   
     return
   
      dispalyMsg; }
 }

 
   
     public
   
      MyEventArgs()
 : 
   
     this
   
     (
   
     string
   
     .Empty)
 {
 }

 
   
     public
   
      MyEventArgs(
   
     string
   
      msg)
 {
 
   
     this
   
     .dispalyMsg 
   
     =
   
      msg;
 }
 }

 
   
     public
   
      
   
     class
   
      Shape : IDrawingObject
 {
 
   
     public
   
      
   
     event
   
      EventHandler ShapeChanged;

 
   
     public
   
      
   
     void
   
      ChangeShape()
 {
 Console.WriteLine(
   
     "
   
     Do something here before the event…
   
     "
   
     );
 OnShapeChanged(
   
     new
   
      MyEventArgs(
   
     "
   
     hello
   
     "
   
     ));
 Console.WriteLine(
   
     "
   
     or do something here after the event .
   
     "
   
     );
 }

 
   
     protected
   
      
   
     virtual
   
      
   
     void
   
      OnShapeChanged(MyEventArgs e)
 {
 
   
     if
   
      (ShapeChanged 
   
     !=
   
      
   
     null
   
     )
 {
 ShapeChanged(
   
     this
   
     , e);
 }
 }

 }

 
   
     public
   
      
   
     class
   
      TestDemo
 {
 
   
     static
   
      
   
     void
   
      Main(
   
     string
   
     [] args)
 {

 Shape s 
   
     =
   
      
   
     new
   
      Shape();
 s.ShapeChanged 
   
     +=
   
      
   
     new
   
      EventHandler(s_ShapeChanged);
 s.ChangeShape();
 Console.ReadLine();
 }

 
   
     static
   
      
   
     void
   
      s_ShapeChanged(
   
     object
   
      sender, EventArgs e)
 {
 Console.WriteLine(((MyEventArgs)e).DispalyMsg);
 Console.WriteLine(
   
     "
   
     s_ShapeChanged
   
     "
   
     );
 }

 }
}