我也来玩玩WinForm~BeginInvoke让用户体验更好！_.NET_编程开发_程序员俱乐部

前言

先说明一下，本人不太做winform的项目，工作10年以来，一直奋斗在webform的舞台上，今天有机会也接触了一下winform，下面对工作中用到的BeginInvoke方法作一下说明，和大家也一起学习一下，呵呵。

BeginInvoke产生的原因

首先一个winform程序运行后，会有一个主线程（UI），我们看到的页面上的元素，表单，列表框等等都运行在主线程上的，主线程一阻塞，这些东西就都点不了了，呵呵，所以，在我们运行一些耗时的功能时，通常会开启一个新的线程去干这事，这是和乎情理的，想像一下，当我们在新线程里工作时，主线程不被阻塞（不假死），用户体验是多么好呀，当在新线程里干完事后，把消息返回给主线程，就OK了！

美中不足

想的挺好，可惜在新线程里，干完事后，运行程序，在为主窗体元素赋值时，出错了，说是不能访问主线程的元素，这到是正常的，线程与线程本来就是独立的，所以只能找其它方法了（可以使用这个方法解决上面的问题，但不推荐：  Control.CheckForIllegalCrossThreadCalls = false;）

BeginInvoke出来了

微软为了解决上面的线程之间信息相互访问的问题，封装了BeginInvoke方法，它允许我们传入一个委托，在委托方法中干这件时，这时你的主线程元素是可以被访问的，当处理完成后，可以操纵主线程的元素，即主线程元素重新赋值。

下面是一个简单的例子：

        /// <summary>
        /// 批量添加
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            message.Text = "程序正在处理...";

            var beginInvokeThread = new Thread(new ThreadStart(() =>
            {

                #region BeginInvoke
                Func<DateTime, ReturnMsg> funDelegate = new Func<DateTime, ReturnMsg>(InvodeGeneratorUserData);
                IAsyncResult aResult = this.BeginInvoke(funDelegate, dateTimePicker1.Value);
                aResult.AsyncWaitHandle.WaitOne(-1);
                if (aResult.IsCompleted)//这里不可以访问主线程的信息
                    MessageBox.Show(((ReturnMsg)this.EndInvoke(aResult)).GetDescription());
                #endregion
            }));
            beginInvokeThread.Start();
        }

委托方法如下：

        /// <summary>
        /// 一个委托，去干用户填充这件事，完了事，把消息返回并填充到主窗体（主线程）的页面元素上
        /// </summary>
        /// <param name="month"></param>
        /// <returns></returns>
        private ReturnMsg InvodeGeneratorUserData(DateTime month)
        {
            var aResult = userBll.GeneratorUserData(month);
            this.message.Text = aResult.GetDescription();//这里可以访问主线程的信息
            return aResult;
        }

下面是运行的效果图：

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