解决窗体假死的几个方案

C#中 使用 Backgroundworker控制UI线程 防止界面假死情况

在C#.net窗体编程中，非主线程调用该UI界面的时候往往会出现一些界面无响应或者假死的情况，我们可以用Backgroundworker很好的解决这一个问题。

第一步，我们先建立一个Windows应用程序，取名XXX

第二步，我们在左侧工具箱中找到组件下面的BackgroundWorker组件，拖至Form中，为了让大家很好的体验到Background的作用，我们拖放两个Backgroundworker组件到Form中，分别为backgroudworker1和backgroundworker2

第三步，分别选择这两个组件的属性WorkReportsProgress和WorkerSupportsCancellation属性设置为true,先做个小小的解释，WorkReportsProgress：backgroundworker组件的DoWork事件触发的时候，会想backgroundworker组件报告DoWork事件中的执行情况，这样，我们就可以对UI进行相应的抄作，如果暂时看不懂，没关系，可能是我解释得太差了，看了下面的代码大家一定会明白...

第四步，确认第三不工作已经完成的情况下，我们在界面上拖放两个Button，分别为btn1,btn2,以及两个processbar，分别为processbar1,processbar2

第四步，backgroundworker1 组件有三个事件，分别为

{

}

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{

}

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{

}

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { } private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e) { } private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { }

 

 

 

现在我们来让这两个进度条走起来

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;

namespace BackGroundWork
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 1; i <= 65; i++)
            {
                this.backgroundWorker1.ReportProgress(i);
                System.Threading.Thread.Sleep(200);
            }
        }

        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            int m=e.ProgressPercentage*100/65;
            this.progressBar1.Value = m;
            this.label1.Text = m + "%";
        }

        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            this.button1.Enabled = true;
            this.progressBar1.Value = 0;
            MessageBox.Show("BackgroundWorker1 任务完成");
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.button1.Enabled = false;
            this.backgroundWorker1.RunWorkerAsync();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.button2.Enabled = false;
            this.backgroundWorker2.RunWorkerAsync();
        }

        private void backgroundWorker2_DoWork(object sender, DoWorkEventArgs e)
        {
            for (int i = 1; i <= 30; i++)
            {
                this.backgroundWorker2.ReportProgress(i);
                System.Threading.Thread.Sleep(500);
            }
        }

        private void backgroundWorker2_ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            int m = e.ProgressPercentage * 100 / 65;
            this.progressBar2.Value = m;
            this.label2.Text = m + "%";
        }

        private void backgroundWorker2_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            this.button2.Enabled = true;
            this.progressBar2.Value = 0;
            MessageBox.Show("BackgroundWorker2 任务完成");
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.backgroundWorker1.Dispose();
            this.progressBar1.Value = 0;
            this.label1.Hide();
        }
    }
}