求问C#大神

Question

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！

Answer 1

 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。

Answer 2

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

Answer 3

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

Answer 4

 BeginInvoke((EventHandler)delegate
            {
                label2.Text = "kao";
            });
这么写试试

Answer 5

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 { }