C#实现简单的委托异步调用

 delegate void textAsy();
        static void Main(string[] args)
        {
 
            textAsy t = texts;
            AsyncCallback callBack = new AsyncCallback(sendCallBack);
            t.BeginInvoke(callBack, new { timeNow= DateTime.Now.Ticks,timeStr=DateTime.Now.ToString() });
            Console.WriteLine(DateTime.Now);
            Console.Read();
        }
        public static void texts()
        {
            Thread.Sleep(1100);
            Console.WriteLine(DateTime.Now);
        }
 
        //3）在回调函数中使用StateObject
        private static void sendCallBack(IAsyncResult ar)
        {
 
            Console.WriteLine("异步状态" + ((dynamic)ar.AsyncState).timeNow + ((dynamic)ar.AsyncState).timeStr);
        }

　　

由于操作是异步的 我们不知道他什么时候完成 所以一般采用回调函数处理　　

 delegate void textAsy();
        static void Main(string[] args)
        {
 
            textAsy t = texts;
            AsyncCallback callBack = new AsyncCallback(sendCallBack);
            t.BeginInvoke(callBack,DateTime.Now.Ticks);
            Console.WriteLine(DateTime.Now);
            Console.Read();
        }
        public static void texts()
        {
            Thread.Sleep(1100);
            Console.WriteLine(DateTime.Now);
        }
 
        //3）在回调函数中使用StateObject
        private static void sendCallBack(IAsyncResult ar)
        {
 
            Console.WriteLine("异步状态"+(long)ar.AsyncState);
        }

　　

　　

ar.AsyncState 就是 t.BeginInvoke(callBack,DateTime.Now.Ticks);中的参数

 delegate void textAsy();
        static void Main(string[] args)
        {
 
            textAsy t = texts;
            AsyncCallback callBack = new AsyncCallback(sendCallBack);
            t.BeginInvoke(callBack, new { timeNow= DateTime.Now.Ticks,timeStr=DateTime.Now.ToString() });
            Console.WriteLine(DateTime.Now);
            Console.Read();
        }
        public static void texts()
        {
            Thread.Sleep(1100);
            Console.WriteLine(DateTime.Now);
        }
 
        //3）在回调函数中使用StateObject
        private static void sendCallBack(IAsyncResult ar)
        {
 
            Console.WriteLine("异步状态" + ((dynamic)ar.AsyncState).timeNow + ((dynamic)ar.AsyncState).timeStr);
        }