C#委托实现系统回调

在C#中，系统回调感觉都是用委托实现的（实际委托就应该称为OO化的函数回调）

 

比较典型的是三个

1.cache

 

CacheItemRemovedCallback callBack = new CacheItemRemovedCallback(onRemove);

                HttpContext.Current.Cache.Insert(CacheKey, CacheInfo, null,
                    System.DateTime.Now.AddSeconds(300),
                    System.Web.Caching.Cache.NoSlidingExpiration,
                    System.Web.Caching.CacheItemPriority.Default,
                    callBack);

 

 

        /// <summary>
        /// cache失效时触发
        /// </summary>
        /// <param name="IdentifyCode"></param>
        /// <param name="Info"></param>
        /// <param name="reason"></param>
        private static void onRemove(string IdentifyCode, object CacheInfo, CacheItemRemovedReason reason)
        {

        }

2.Timer

        System.Timers.Timer SSOTimer = new System.Timers.Timer(10000);
        SSOTimer.Elapsed += new System.Timers.ElapsedEventHandler(SSOTimer_Elapsed);
        SSOTimer.AutoReset = true;
        SSOTimer.Enabled = true;

 

    /// <summary>
    /// 达到间隔时发生
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    private void SSOTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
    {

    }

3.异步传输

AsyncCallback acb = new AsyncCallback(WebCallback);
IAsyncResult IAR = BeginByte(WholeParameters, acb, null);
Byte[] ReturnValue = EndByte(IAR);

        /// <summary>
        /// 数据传输完成调用此方法
        /// </summary>
        /// <param name="IAR"></param>

        protected void WebCallback(IAsyncResult IAR)
        {
            //Byte[] ReturnValue = EndPublicObjectHashtableByte(IAR);
        }