C#事件

using System;

namespace SampleApp {
   public delegate string MyDel(string str);

   class EventProgram {
      event MyDel MyEvent;

      public EventProgram() {
         this.MyEvent += new MyDel(this.WelcomeUser);
      }

      public string WelcomeUser(string username) {
         return "Welcome " + username;
      }

      static void Main(string[] args) {
         EventProgram obj1 = new EventProgram();
         string result = obj1.MyEvent("Tutorials Point");
         Console.WriteLine(result);
      }

   }
}