Invoke异步操作类

Invoke异步操作类
 1public    class BackgroundCommand 
 2    {
 3      private SynchronizationContext _synchronizationContext;
 4        /**//// <summary>
 5        /// BeginInvoke完成时回调
 6        /// </summary>
 7     public event AsyncCallback CompleteCallback;
 8     public event SendOrPostCallback CompleteExecute;
 9     public delegate object CommandExecuteHandler(object param);
10        /**//// <summary>
11        /// 异步机制执行的方法
12        /// </summary>
13     public event CommandExecuteHandler DoExecute;
14        /**//// <summary>
15        /// 开始异步
16        /// </summary>
17        /// <returns></returns>
18     public virtual  IAsyncResult BeginExecute(object param)
19        {
20            if (DoExecute != null)
21            {
22                CommandExecuteHandler handler = new CommandExecuteHandler(DoExecute);
23                return handler.BeginInvoke(param,new AsyncCallback(CompleteCallback), handler);
24            }
25            else
26            {
27                throw new Exception("DoExecute 方法还没有实现");
28            }
29        }
30        /**//// <summary>
31        /// 异步结束
32        /// </summary>
33        /// <param name="asyncResult"></param>
34        public virtual void EndExecute(IAsyncResult asyncResult)
35        {
36            CommandExecuteHandler commandHandler = asyncResult.AsyncState as CommandExecuteHandler;
37            object result = commandHandler.EndInvoke(asyncResult);
38
39            System.Threading.Thread.Sleep(1000);
40          
41                CompleteExecute(result);
42        }

调用方法

  private void button1_Click(object sender, EventArgs e)
        {
            ThreadPool.QueueUserWorkItem(new WaitCallback(work),"byf");
        }
        public void work(object param)
        {
             BackgroundCommand command = new BackgroundCommand();
             command.CompleteCallback += new AsyncCallback(command_CompleteCallback);
             command.DoExecute += new BackgroundCommand.CommandExecuteHandler(command_DoExecute);
             command.CompleteExecute += new SendOrPostCallback(command_CompleteExecute);

             IAsyncResult aresult = command.BeginExecute(param);
        
            command.EndExecute(aresult);
        }