C#BackgroundWorker组件

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

private void button1_Click(object sender, EventArgs e)
{
this.btn_Calculate.Enabled = false;//设置计算按键不可用
this.tb_result.Text = string.Empty;//清空文本框内容
this.btn_cancel.Enabled = true; //设置取消按键可用
this.progressBar1.Value = 0;

//启动后台线程，实例化一个CalcInput对象传给新线程
backgroundWorker1.RunWorkerAsync(
new CalcInput(
int.Parse(this.tb_x.Text),
int.Parse(this.tb_y.Text)
)
);
}

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
//从DoWorkEventArgs类型参数e的Argument属性得到传入的对象实例
CalcInput input = (CalcInput)e.Argument;
//模拟执行时间
for (int i = 0; i < 10; i++)
{
input.x += input.y;
Thread.Sleep(300);
if(backgroundWorker1.CancellationPending)
{
e.Cancel = true;
return;
}
}

//将计算结果交给参数e的Result属性
e.Result = input.x;
}

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
this.btn_Calculate.Enabled = true;//设置计算按键不可用

if (e.Cancelled)
{
this.tb_result.Text = "计算中断";
}
else
{
this.tb_result.Text = e.Result.ToString();
}

this.btn_cancel.Enabled = false;
this.progressBar1.Value = 100;

}

private void btn_cancel_Click(object sender, EventArgs e)
{
backgroundWorker1.CancelAsync();
}

}
}