异步调用方法

        //声明委托
        public delegate string Deleg(string str);
        private void btnSync_Click(object sender, RoutedEventArgs e)
        {
            //实例化委托并赋值
            Deleg deleg = new Deleg(ShowMsg);
            //实例化回调方法
            AsyncCallback callback = Call;
            //开始异步
            deleg.BeginInvoke("King1", callback, deleg);
        }
        /// <summary>
        /// 委托调用的方法，执行方法体，生成返回值
        /// </summary>
        /// <param name="msg"></param>
        /// <returns></returns>
        public string ShowMsg(string msg)
        {
            return msg + ";返回";
        }
        /// <summary>
        /// 回调方法体，ShowMsg执行完成会调用此方法。处理返回值
        /// </summary>
        /// <param name="result"></param>
        public void Call(IAsyncResult result)
        {
            Deleg deleg = (Deleg)result.AsyncState;
            //取到返回值
            string res = deleg.EndInvoke(result);
            MessageBox.Show(res);
        }

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