求问C#大神

[lc1992345]

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

namespace WindowsFormsApplication5
{
public delegate void progressbarDelegate();



public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();


}

private void Form1_Load(object sender, EventArgs e)
{

}



private void button1_Click(object sender, EventArgs e)
{
//Thread thread_bar1 = new Thread(new ThreadStart(ttread));
//thread_bar1.Start();
//delprogress(progress);
Thread demoThread =new Thread(new ThreadStart(this.ThreadProcSafe));
demoThread.Start();
}

private void ThreadProcSafe()
{
this.progress();
}




private void progress()
{




if (this.progressBar1.InvokeRequired || this.label5.InvokeRequired)
{

progressbarDelegate d = new progressbarDelegate(progress);

if(this.IsHandleCreated)
{
this.Invoke(d, new object[] { });
}
}
else
{

progressBar1.Maximum = 100;
for (int rownum = 1; rownum <= 100; rownum++)
{
//你所要执行的业务。
rownum++;//循环次数
//把当前循环次数赋值给进度条的value。
progressBar1.Value = rownum;
// 这个很关键，让程序去执行进度条的前进动作
label5.Text = progressBar1.Value + "%";

Application.DoEvents();
Thread.Sleep(100);
if (rownum == 100)
{
rownum = 0;
}
}
}
}



}
}

程序执行无误，但是点击关闭按钮之后，红色部分会报错：在创建窗口句柄之前，不能在控件上调用 Invoke 或 BeginInvoke。折腾了一天了！

[lc1992345]

自己顶一下

[XBodhi.]

 void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            timer.Enabled = false;
            Set();  
          
        }

        delegate void SetValueHandler(string key,string value);
        SetValueHandler svh;
        private void Set()
        {
            svh = new SetValueHandler(SetControlValue);
            svh.Invoke("label1", "test1");
            svh.Invoke("label2", "test2");
        }

        private void SetControlValue(string key, string value)
        {
            
            Control control = this.Controls.Find(key, true)[0];
            if (control.InvokeRequired)
            {
                control.Invoke(svh, new object[] { key, value });
            }
            else
            {
                control.Text = value; 
            }  
        }

自己改去， 举一反三，可以改成通用的方法。

[sosoben]

你Thread.Sleep(100); 是线程在sleep 了 所以窗体关闭，线程还没运行完吧，关闭窗体的时候加上关闭线程吧

[wuyq11]

Windows控件，只能在创建它的线程里访问它，
在不同的线程访问，要通过当前线程的Invoke方法来调用

[maomixi]

 BeginInvoke((EventHandler)delegate
            {
                label2.Text = "kao";
            });

这么写试试

[超级大咸鱼]

将线程定义在外面.

Thread demoThread =null;
private void button1_Click(object sender, EventArgs e)
  {
  //Thread thread_bar1 = new Thread(new ThreadStart(ttread));
  //thread_bar1.Start();
  //delprogress(progress);
  demoThread =new Thread(new ThreadStart(this.ThreadProcSafe));
  demoThread.Start();
  }

在窗体关闭的事件中添加以下代码

try
            {
                if (demoThread .IsAlive)
                {
                    demoThread .Abort();
                }
            }
            catch { }