C# 注销掉事件，解决多播委托链表的问题

c#的事件是多播委托。当绑定多个事件时，事件会依次触发,清除掉注册的委托链表：方法1

 C# Code 

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private void ClearAllEvents (object objectHasEvents, string eventName) {     if (objectHasEvents == null)     {         return;     }     try     {         EventInfo[] events = objectHasEvents.GetType().GetEvents (BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);         if (events == null || events.Length < 1)         {             return;         }         for (int i = 0; i < events.Length; i++)         {             EventInfo ei = events[i];             if (ei.Name == eventName)             {                 FieldInfo fi = ei.DeclaringType.GetField ("printPageHandler", BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);                 if (fi != null)                 {                     fi.SetValue (objectHasEvents, null);                 }                 break;             }         }     }     catch     {     } }

 

 

 C# Code 

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//事件           #region 开始查询用户业务编码事件  /// <summary>         /// 开始查询用户业务编码事件         /// </summary>         public static event EventHandler _BeginSearchUserCodeEvent;         public static event EventHandler BeginSearchUserCodeEvent         {             add             {                 ClearBeginSearchUserCodeEvent();                 _BeginSearchUserCodeEvent += value;                 last_BeginSearchUserCodeEvent.Add(value);             }             remove             {                 _BeginSearchUserCodeEvent -= value;             }           }         //上一次的BeginSearchUserCodeEvent委托         private static List<EventHandler> last_BeginSearchUserCodeEvent = new List<EventHandler>();         private static void ClearBeginSearchUserCodeEvent()         {             if (last_BeginSearchUserCodeEvent.Count <= 0)             {                 return;             }             //注销掉  事件             for (int i = 0; i < last_BeginSearchUserCodeEvent.Count; i++)             {                 _BeginSearchUserCodeEvent -= last_BeginSearchUserCodeEvent[i];             }         }         #endregion               #region  结束查询用户业务编码事件                /// <summary>         /// 结束查询用户业务编码事件         /// </summary>         public static event EventHandler _EndSearchUserCodeEvent;         public static event EventHandler EndSearchUserCodeEvent         {               add             {                 ClearEndSearchUserCodeEvent();                 _EndSearchUserCodeEvent += value;                 last_EndSearchUserCodeEvent.Add(value);             }             remove             {                 _EndSearchUserCodeEvent -= value;             }           }         //上一次的EndSearchUserCodeEvent委托         private static List<EventHandler> last_EndSearchUserCodeEvent = new List<EventHandler>();         private static void ClearEndSearchUserCodeEvent()         {             if (last_EndSearchUserCodeEvent.Count <= 0)             {                 return;             }             //注销掉  事件             for (int i = 0; i < last_EndSearchUserCodeEvent.Count; i++)             {                 _EndSearchUserCodeEvent -= last_EndSearchUserCodeEvent[i];             }         }           #endregion