c# BackgroundWorker组件的作用

当构建一个图形化的Windows Form桌面应用程序并且需要执行在应用程序主UI线程之外的线程中长时间的任务时，BackgroundWorker类就很有用了。

要使用BackgroundWorker，我们只需要告诉它希望在后台执行那个方法并且调用RunWorkerAsync（）即可

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

private void button1_Click(object sender, EventArgs e)
   {
     int a = int.Parse(textBox1.Text.Trim());
     int b = int.Parse(textBox2.Text.Trim());
     Add ad = new Add(a,b);
     backgroundWorker1.RunWorkerAsync(ad);
   }

private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e)
   {
      Add args=(Add)e.Argument;
      for (int i = 0; i < 11; i++)
      {
        Thread.Sleep(200);
        backgroundWorker1.ReportProgress(i*10);
      }

e.Result = args.a + args.b;
   }

private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
   {
     label1.Text = e.Result.ToString();
   }

private void backgroundWorker1_ProgressChanged(object sender, ProgressChangedEventArgs e)
   {
     progressBar1.Value = e.ProgressPercentage;
   }
 }
 public class Add
 {
   public int a;
   public int b;
   public Add(int a, int b)
   {
     this.a = a;
     this.b = b;
   }

}

来源：https://www.cnblogs.com/wangzhenghua/p/4448752.html