c#中关于backgroundWorker控件的用法

所需控件如下： 三个textbox，两个button，一个进度条，一个backgroundWorker控件

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

private void button1_Click(object sender, EventArgs e)
{
//设置计算按扭与取消按扭的使用属性以及进度条的进度值
this.button1.Enabled = false;
this.textBox3.Text = string.Empty;
this.button2.Enabled = true;
this.progressBar1.Value = 0;
backgroundWorker1.RunWorkerAsync(new CalcInput(int.Parse(this.textBox1.Text), int.Parse(this.textBox2.Text)));//开始执行后台操作
}

//当执行后台操作时，后台线程开始执行此操作
private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
{
CalcInput input = (CalcInput)e.Argument;
//System.Threading.Thread.Sleep(5000);
//e.Result = input.x + input.y;
for (int i = 0; i < 10; i++)
{
System.Threading.Thread.Sleep(500);
backgroundWorker1.ReportProgress(i * 10);
if (backgroundWorker1.CancellationPending)
{
e.Cancel = true;
return;
}
}
e.Result = input.x + input.y;
}

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
this.progressBar1.Value = e.ProgressPercentage; //设置进度条的value值
}

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
//this.textBox3.Text = e.Result.ToString();
//this.button2.Enabled = true;
//this.button1.Enabled = false;
//this.progressBar1.Value = 100;
if (e.Cancelled)
{
this.textBox3.Text = "cancelled";

}
else
{
this.textBox3.Text = e.Result.ToString();
}
this.button2.Enabled = true;
this.button1.Enabled = false;
this.progressBar1.Value = 100;
}

private void button2_Click(object sender, EventArgs e)
{
backgroundWorker1.CancelAsync();//执行此操作时，需将backgroundWorker1控件WorkerSupportCancellation属性设置为true
}
}

//记录两个文本框的值
public struct CalcInput
{
public CalcInput(int x, int Y)
{
this.x = x;
this.y = Y;
}
public int x;
public int y;
}