C#下Backgroundworker使用例子

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Threading;namespace Backgroundworker使用{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();            backgroundWorker1.WorkerReportsProgress = true;            backgroundWorker1.WorkerSupportsCancellation = true;            btn_Stop.Enabled = false;         }        private void btn_Start_Click(object sender, EventArgs e)        {            txt_Text.Text = "开始产生10000以内的随机数……\n\n";            btn_Start.Enabled = false;            btn_Stop.Enabled = true;            //在后台线程开始操作              backgroundWorker1.RunWorkerAsync();         }        private void btn_Stop_Click(object sender, EventArgs e)        {            backgroundWorker1.CancelAsync();            btn_Stop.Enabled = false;            btn_Start.Enabled = true;         }        private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)        {            //不要直接使用组件实例名称（backgroundWorker1),因为有多个BackgroundWorker时，              //直接使用会产生耦合问题，应该通过下面的转换使用它              BackgroundWorker worker = sender as BackgroundWorker;            //下面的内容相当于线程要处理的内容。//注意：不要在此事件中和界面控件打交道              Random r = new Random();            int numCount = 0;            while (worker.CancellationPending == false)            {                int num = r.Next(0, 10000);                if (num % 5 == 0)                {                    numCount++;                    worker.ReportProgress(0, num);                    Thread.Sleep(10);                }            }            e.Result = numCount;          }        private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)        {            int num = (int)e.UserState;            txt_Text.Text += num + " \r\n";          }        private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)        {            if (e.Error == null)                txt_Text.Text += "\n\n操作停止，共生产" + e.Result + "个能被5整除的随机数";            else                txt_Text.Text += "\n操作过程中产生错误：" + e.Error;          }                   }}