在C#使用字典存储事件示例及实现自定义事件访问器

public delegate void EventHandler1(int i);
public delegate void EventHandler2(string s);

public class PropertyEventsSample
{
  private System.Collections.Generic.Dictionary<string, System.Delegate> eventTable;

  public PropertyEventsSample()
  {
    eventTable = new System.Collections.Generic.Dictionary<string, System.Delegate>();
    eventTable.Add("Event1", null);
    eventTable.Add("Event2", null);
  }

  public event EventHandler1 Event1
  {
    add
    {
      lock (eventTable)
      {
        eventTable["Event1"] = (EventHandler1)eventTable["Event1"] + value;
      }
    }
    remove
    {
      lock (eventTable)
      {
        eventTable["Event1"] = (EventHandler1)eventTable["Event1"] - value;
      }
    }
  }

  public event EventHandler2 Event2
  {
    add
    {
      lock (eventTable)
      {
        eventTable["Event2"] = (EventHandler2)eventTable["Event2"] + value;
      }
    }
    remove
    {
      lock (eventTable)
      {
        eventTable["Event2"] = (EventHandler2)eventTable["Event2"] - value;
      }
    }
  }

  internal void RaiseEvent1(int i)
  {
    EventHandler1 handler1;
    if (null != (handler1 = (EventHandler1)eventTable["Event1"]))
    {
      handler1(i);
    }
  }

  internal void RaiseEvent2(string s)
  {
    EventHandler2 handler2;
    if (null != (handler2 = (EventHandler2)eventTable["Event2"]))
    {
      handler2(s);
    }
  }
}

public class TestClass
{
  public static void Delegate1Method(int i)
  {
    System.Console.WriteLine(i);
  }

  public static void Delegate2Method(string s)
  {
    System.Console.WriteLine(s);
  }

  static void Main()
  {
    PropertyEventsSample p = new PropertyEventsSample();

    p.Event1 += new EventHandler1(TestClass.Delegate1Method);
    p.Event1 += new EventHandler1(TestClass.Delegate1Method);
    p.Event1 -= new EventHandler1(TestClass.Delegate1Method);
    p.RaiseEvent1(2);

    p.Event2 += new EventHandler2(TestClass.Delegate2Method);
    p.Event2 += new EventHandler2(TestClass.Delegate2Method);
    p.Event2 -= new EventHandler2(TestClass.Delegate2Method);
    p.RaiseEvent2("TestString");

    // Keep the console window open in debug mode.
    System.Console.WriteLine("Press any key to exit.");
    System.Console.ReadKey();
  }
}

  2
  TestString

event EventHandler IDrawingObject.OnDraw
    {
      add
      {
        lock (PreDrawEvent)
        {
          PreDrawEvent += value;
        }
      }
      remove
      {
        lock (PreDrawEvent)
        {
          PreDrawEvent -= value;
        }
      }
    }