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;
    }

  }

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