[请问][难度有关问题]按钮事件中有循环的有关问题，用另一个按钮控制停止，暂停，继续

[请教][难度问题]按钮事件中有循环的问题，用另一个按钮控制停止，暂停，继续
窗体上两按钮button1,button2和一个lable1;
按钮1的单击事件如下
private void button1_Click(object sender, EventArgs e)
  {
  label1.Refresh();
  label1.Text = "";
  for (int i = 0; i < 10000&&run==false; i++)
  {
  label1.Text = i.ToString();
  label1.Refresh();
  System.Threading.Thread.Sleep(100);
  }
  }
也就是按钮1不停循环改变lable1的文字；

问题：怎么实现用button2来控制button1事件的执行，如暂停，继续，停止等等！

[解决办法]
这个，说来也容易。原理就不废话了。

C# code

public enum RunState{     running,     pause,     suppend}RunState state = RunState.suppend;bool Restart = false;RunProc(...)//执行的部分{     while(state != RunState.suppend)     {          //执行操作           Application.DoEvents();          if(state == RunState.suppend) break;//保证可以正常退出          while(state == RunState.pause)//保证可以暂停，不过这样效率不高：）但实现这个功能也只能如此了。          {               Application.DoEvents();          }     }     if(Restart)     {          Restart = False;          Button2.PerformClick();     }}Button2_Clicked(...)//开始{     if(state != RunState.suppend)     {          state = RunState.suppend;          Restart = true;     }     state = RunState.running;     RunProc();}Button3_Clicked(...)//暂停{     state = RunState.pause;}Button4_Clicked(...)//停止{     state = RunState.suppend;}
[解决办法]
没有编译器调试，就随手写的，貌似上面写错了一点。用下面的
C# code
public enum RunState{     running,     pause,     suppend}RunState state = RunState.suppend;bool Restart = false;RunProc(...)//执行的部分{     while(state != RunState.suppend)     {          //....................//          //执行你的操作          Application.DoEvents();          if(state == RunState.suppend) break;//保证可以正常退出          while(state == RunState.pause)//保证可以暂停，不过这样效率不高：）但实现这个功能也只能如此了。          {               Application.DoEvents();          }     }     if(Restart)     {          Restart = False;          Button2.PerformClick();     }}Button2_Clicked(...)//开始{     if(state != RunState.suppend)     {          state = RunState.suppend;          Restart = true;          return;//修改了这里，要退出栈     }     state = RunState.running;     RunProc();}Button3_Clicked(...)//暂停{     state = RunState.pause;}Button4_Clicked(...)//停止{     state = RunState.suppend;}
[解决办法]
改了下，Restart没看出有什么实际的用处所以删掉了。
这个最好还是用线程或者BackgroundWorker，用法很简单，参考MSDN
       public enum RunState
       {
           running,
           pause,
           suppend
       }

       RunState state = RunState.suppend;
       int i = 0;

       private void RunProc()//执行的部分
       {
           while(i<10000)
           {
               label1.Text = i.ToString();
               label1.Refresh();
               System.Threading.Thread.Sleep(200);
               Application.DoEvents();
               if (state == RunState.suppend)
               {
                   i = 0;
                   label1.Text = i.ToString();
                   label1.Refresh();
                   break;//保证可以正常退出
               }
               while (state == RunState.pause)//保证可以暂停，不过这样效率不高：）但实现这个功能也只能如此了。
               {
                   Application.DoEvents();
               }

               i++;
           }
       }

       private void button1_Click(object sender, EventArgs e)
       {
           if (state != RunState.suppend) 
 
           {
               state = RunState.running;
               return;//修改了这里，要退出栈
           }
           state = RunState.running;
           label1.Refresh();
           label1.Text = "";
           RunProc();
       }

       private void button2_Click(object sender, EventArgs e)
       {
           state = RunState.pause;
       }

       private void button3_Click(object sender, EventArgs e)
       {
           state = RunState.suppend;
       }

[解决办法]
参考MSDN实例：下面的代码示例演示如何使用 BackgroundWorker 类异步执行耗时的操作。该操作计算选定的斐波纳契数，在计算过程中报告进度更新，并允许取消挂起的计算。
ms-help://MS.MSDNQTR.v80.chs/MS.MSDN.v80/MS.NETDEVFX.v20.chs/cpref3/html/T_System_ComponentModel_BackgroundWorker.htm