C#利用子线程刷新主线程

使用线程操作

using System; using System.Threading; using System.Windows.Forms;  namespace WinThread {     public partial class frmMain : Form     {         public frmMain()         {             InitializeComponent();         }          /// <summary>         /// 初始化         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void frmMain_Load(object sender, EventArgs e)         {             // 控件初始化             this.txtOne.Text = "0";             this.txtSecond.Text = "0";              // 显示时间操作             Thread showTimeThread = new Thread(new ThreadStart(GetTime));             showTimeThread.IsBackground = true;             showTimeThread.Start();              //　加法操作             Thread addThread = new Thread(new ThreadStart(Add));             addThread.IsBackground = true;             addThread.Start();         }          #region 显示时间操作          /// <summary>         /// 取得实时时间         /// </summary>         private void GetTime()         {             try             {                 while (true)                 {  string currentTime = string.Format("{0}.{1}", DateTime.Now.ToLongTimeString(),            DateTime.Now.Millisecond);   ShowTime(currentTime);   Application.DoEvents();                 }             }             catch (Exception ex)             {                 Console.WriteLine(ex.Message);             }         }          // 定义显示时间操作委托，用于回调显示时间方法         delegate void ShowTimeCallBack(string str);          /// <summary>         /// 实时显示时间         /// </summary>         /// <param name="str"></param>         private void ShowTime(string str)         {             if (this.txtCurrentTime.InvokeRequired)             {                 ShowTimeCallBack showTimeCallBack = new ShowTimeCallBack(ShowTime);                 this.Invoke(showTimeCallBack, new object[] { str });             }             else             {                 this.txtCurrentTime.Text = str;             }         }          #endregion          #region 加法操作          /// <summary>         /// 加法操作         /// </summary>         private void Add()         {             try             {                 while (true)                 {  int i = Convert.ToInt32(this.txtOne.Text.Trim());  int j = Convert.ToInt32(this.txtSecond.Text.Trim());   ShowResult((i + j).ToString());   Application.DoEvents();                 }             }             catch (Exception ex)             {                 Console.WriteLine(ex.Message);             }         }          // 定义加法操作委托，用于回调加法操作方法         delegate void ShowResultCallBack(string result);          /// <summary>         /// 显示结果         /// </summary>         /// <param name="result"></param>         private void ShowResult(string result)         {             if (this.txtResult.InvokeRequired)             {                 // 写法1                 //ShowResultCallBack showResultCallBack = new ShowResultCallBack(ShowResult);                 //this.Invoke(showResultCallBack, new object[] { result });               // 写法2                 //使用委托来赋值                 this.txtResult.Invoke(  //委托方法  new ShowResultCallBack(ShowResult),  new object[] { result });             }             else             {                 this.txtResult.Text = result;             }         }          #endregion     } }