C#:实现接口中定义的事件

public delegate void TestDelegate();   // delegate declaration

 public interface ITestInterface
 {
     event TestDelegate TestEvent;
     void FireAway();
 }

 public class TestClass : ITestInterface
 {
     public event TestDelegate TestEvent;

     public void FireAway()
     {
         if (TestEvent != null)
         {
             TestEvent();
         }
     }
 }

 public class MainClass
 {
     static private void F()
     {
         System.Console.WriteLine("This is called when the event fires.");
     }

     static void Main()
     {
         ITestInterface i = new TestClass();

         i.TestEvent += new TestDelegate(F);
         i.FireAway();
     }
 }