要求：如下图，使用线程操作

1、实时显示当前时间

2、输入加数和被加数，自动出现结果

分析：两个问题解决的方式一致，使用子线程进行时间操作和加法操作，然后刷新主线程的控件显示结果

1 using System;  2 using System.Threading;  3 using System.Windows.Forms;  4   5 namespace WinThread  6 {  7     public partial class frmMain : Form  8     {  9         public frmMain() 10         { 11             InitializeComponent(); 12         } 13  14         /// 
 15         /// 初始化 16         /// 
 17         ///  18         ///  19         private void frmMain_Load(object sender, EventArgs e) 20         { 21             // 控件初始化 22             this.txtOne.Text = "0"; 23             this.txtSecond.Text = "0"; 24  25             // 显示时间操作 26             Thread showTimeThread = new Thread(new ThreadStart(GetTime)); 27             showTimeThread.IsBackground = true; 28             showTimeThread.Start(); 29  30             //　加法操作 31             Thread addThread = new Thread(new ThreadStart(Add)); 32             addThread.IsBackground = true; 33             addThread.Start(); 34         } 35  36         #region 显示时间操作 37  38         /// 
 39         /// 取得实时时间 40         /// 
 41         private void GetTime() 42         { 43             try 44             { 45                 while (true) 46                 { 47                     string currentTime = string.Format("{0}.{1}", DateTime.Now.ToLongTimeString(), DateTime.Now.Millisecond); 48  49                     ShowTime(currentTime); 50  51                     Application.DoEvents(); 52                 } 53             } 54             catch (Exception ex) 55             { 56                 Console.WriteLine(ex.Message); 57             } 58         } 59  60         // 定义显示时间操作委托，用于回调显示时间方法 61         delegate void ShowTimeCallBack(string str); 62  63         /// 
 64         /// 实时显示时间 65         /// 
 66         ///  67         private void ShowTime(string str) 68         { 69             if (this.txtCurrentTime.InvokeRequired) 70             { 71                 ShowTimeCallBack showTimeCallBack = new ShowTimeCallBack(ShowTime); 72                 this.Invoke(showTimeCallBack, new object[] { str }); 73             } 74             else 75             { 76                 this.txtCurrentTime.Text = str; 77             } 78         } 79  80         #endregion 81  82         #region 加法操作 83  84         /// 
 85         /// 加法操作 86         /// 
 87         private void Add() 88         { 89             try 90             { 91                 while (true) 92                 { 93                     int i = Convert.ToInt32(this.txtOne.Text.Trim()); 94                     int j = Convert.ToInt32(this.txtSecond.Text.Trim()); 95  96                     ShowResult((i + j).ToString()); 97  98                     Application.DoEvents(); 99                 }100             }101             catch (Exception ex)102             {103                 Console.WriteLine(ex.Message);104             }105         }106 107         // 定义加法操作委托，用于回调加法操作方法108         delegate void ShowResultCallBack(string result);109 110         /// 
111         /// 显示结果112         /// 
113         /// 114         private void ShowResult(string result)115         {116             if (this.txtResult.InvokeRequired)117             {118                 // 写法1119                 //ShowResultCallBack showResultCallBack = new ShowResultCallBack(ShowResult);120                 //this.Invoke(showResultCallBack, new object[] { result });121                 122                 // 写法2123                 //使用委托来赋值124                 this.txtResult.Invoke(125                     //委托方法126                     new ShowResultCallBack(ShowResult),127                     new object[] { result });128             }129             else130             {131                 this.txtResult.Text = result;132             }133         }134 135         #endregion136     }137 }

是不是很简单呢？