[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

[龙宜坡]

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！

[兔子-顾问]

这个，说来也容易。原理就不废话了。

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;
}

[兔子-顾问]

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

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;
}

[兔子-顾问]

如果想效率高。就单独启动一个线程来执行RunProc

[aamaomao]

用个线程来做不就行了，暂停、继续和停止直接操作这个线程

[龙宜坡]

为了使用户界面更友好点，我想加入进度条显示执行的百分比该如何？
知道ProgessBar和BackgroundWorker控件，不知道该如何加进去？
ProgessBar只能在代码中设置百分比么？
BackgroundWorker没有百分比的显示么？

[龙宜坡]

本人对多线程不是很熟悉！
请教是否把button1的事件放入一个线程Thread1中执行，用进度条显示执行状况，
而用button2或更多控件来控制Thread1的停止，继续，暂停，重启动呢？

[龙宜坡]

To:wuyazhe

Button2.PerformClick();
这个是什么方法？

[龙宜坡]

button2和Button2失误了，谢谢！

[龙宜坡]

依照“wuyazhe ”的方法实现了，不过有待改进！

public partial class Form1 : Form
{
public enum RunState
{
running,
pause,
suppend
}

RunState state = RunState.suppend;
bool Restart = false;

public Form1()
{
InitializeComponent();
}

private void RunProc()//执行的部分
{
label1.Refresh();
label1.Text = "";
for (int i = 0; i < 10000 && state != RunState.suppend;i++ )
{

label1.Text = i.ToString();
label1.Refresh();
DateTime time = DateTime.Now;
while ((DateTime.Now - time) < TimeSpan.FromMilliseconds(200))
{ }
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();
}
}

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

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

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

[龙宜坡]

第一次点button1和button2后，
第二次以后需要点两次才达到预期目的，不知道是怎么回事？

[SDFDSAC]

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;
}

[SDFDSAC]

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

[龙宜坡]

暂停，继续，停止得以实现，使用Timer控件！
首先在窗体上有
lable1,//运行显示
button1,//开始
button2,//暂停和继续
button3//停止
窗体上还放Timer控件timer1

代码实现如下，

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace testMain
{
public partial class Form1 : Form
{
public enum RunState
{
running,
pause,
stop
}

private int i = 0;

RunState state = RunState.stop;

public Form1()
{
InitializeComponent();
}

private void RunProc(object sender,EventArgs e)//执行的部分
{
timer1.Enabled = false;
if (state == RunState.running)
{
label1.Refresh();
label1.Text = "";
label1.Text = i.ToString();
label1.Refresh();
i++;
timer1.Enabled = true;
}
}

private void button1_Click(object sender, EventArgs e)
{
if (this.button1.Text == "开始")
{
this.button1.Enabled = false;
this.button2.Enabled = true;
this.button3.Enabled = true;

timer1.Tick += new EventHandler(RunProc);
timer1.Enabled = true;

this.state = RunState.running;
}
}

private void button2_Click(object sender, EventArgs e)
{
if (this.button2.Text == "暂停")
{
timer1.Enabled = false;
state = RunState.pause;

this.button2.Text = "继续";
}
else
{
timer1.Enabled = true;
this.state = RunState.running;
this.button2.Text = "暂停";
this.button2.Enabled = true;
//timer1.Start();
}
}

private void button3_Click(object sender, EventArgs e)
{
this.timer1.Enabled = false;
this.i = 0;
this.label1.Text = "0";
this.state = RunState.stop;

this.button1.Text = "开始";
this.button1.Enabled = true;
this.button2.Text = "暂停";
this.button2.Enabled = false;
this.button3.Enabled=false;
}

private void Form1_Load(object sender, EventArgs e)
{
this.label1.Text = "0";
this.button2.Enabled = false;
this.button3.Enabled = false;
}
}
}

[龙宜坡]

谢谢，我再想法加个进度条之类的东西！

[SDFDSAC]

加个flag，在button1里面判断，button2负责修改

[guyehanxinlei]

同意楼上