C# 采用系统委托的方式处理线程内操作窗体控件

一、System.Windows.Forms.MethodInvoker 类型是一个系统定义的委托，用于调用不带参数的方法。
        private Thread myThread;

        private void Form1_Load(object sender, EventArgs e)

        {

            myThread = new Thread(new ThreadStart(RunsOnWorkerThread));

            myThread.Start();

        }

        private void RunsOnWorkerThread()

        {

            MethodInvoker mi = new MethodInvoker(SetControlsProp);

            BeginInvoke(mi);

        }

        private void SetControlsProp()

        {

            label1.Text = "myThread线程调用UI控件";

        }

 

二、直接用System.EventHandle（可带参数）

        private Thread myThread;

        private void Form1_Load(object sender, EventArgs e)

        {

            myThread = new Thread(new ThreadStart(RunsOnWorkerThread));

            myThread.Start();

        }

        private void RunsOnWorkerThread()

        {

            //DoSomethingSlow();

            string pList = "myThread线程调用UI控件";

            label1.BeginInvoke(new System.EventHandler(UpdateUI), pList);

        }

        //直接用System.EventHandler,没有必要自定义委托

        private void UpdateUI(object o, System.EventArgs e)

        {

           //UI线程设置label1属性

            label1.Text = o.ToString() + "成功!";

        }
三、演示程序

        /// <summary>
        /// 提供给系统委托事件调用，解决线程内操作界面控件的目的
        /// </summary>
        /// <param name="obj"></param>
        /// <param name="e"></param>
        private void UpdateListBox(object obj,System.EventArgs e)
        {
            //强制类型转换
            List<String> paramList = (List<string>)obj;
            if (paramList[0] == "0")
            {
                this.lstBoxCatchData.Items.Clear();
            }
            else if (paramList[0] == "1")
            {
                this.lstBoxCatchData.Items.Add(paramList[1].ToString());
            }
        }

        线程中调用部分：

            //初始化参数列表
            List<String> paramList = new List<string>();
            paramList.Add("0");
            paramList.Add("");

                //这里采用系统委托的方式，实现线程内操作系统界面控件。
                paramList[0] = "0"; paramList[1] = "清除屏幕信息";
                lstBoxCatchData.BeginInvoke(new System.EventHandler(UpdateListBox), paramList);

结束。