c#在扫描directores及其子文件夹时使用BackgroundWorker

我在c#中有一个简单的代码，它可以找到所有正在工作的目标目录及其子文件夹，但在处理过程中，我无法与GUI表单交互，我需要使用BackgroundWorker如何使用此代码实现：

  var dir = textBox1.Text = folderBrowserDialog1.SelectedPath; 
  textBox2.Text="";
  string[] extensions = { ".htm", ".html" };
  var files = Directory.EnumerateFiles(dir, "*.*",SearchOption.AllDirectories)
  .Where(s => s.EndsWith(".html") || s.EndsWith(".htm")).OrderBy(f => f);

                 foreach (string file in files)
                 { System.Diagnostics.Debug.WriteLine(file);
                   textBox2.AppendText(file+Environment.NewLine);
                 } 

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你读过这个链接吗？注意从其他线程更新gui（对于BackgroundWorker，这通常在ProgressChanged事件处理程序中完成：

更不用说我找到了解决方案：

    void BackgroundWorker1DoWork(object sender, DoWorkEventArgs e)
    {  
          string[] extensions = { ".htm", ".html" };
          var files = Directory.EnumerateFiles(folderBrowserDialog1.SelectedPath, "*.*", SearchOption.AllDirectories)
         .Where(s => s.EndsWith(".html") || s.EndsWith(".htm")).OrderBy(f => f);


          foreach (string file in files)
           {  
            Thread.Sleep(5);
            System.Diagnostics.Debug.WriteLine(file);
              backgroundWorker1.ReportProgress(0,file+Environment.NewLine);
           }


    }
    void BackgroundWorker1ProgressChanged(object sender, ProgressChangedEventArgs e)
    {

      textBox2.AppendText(e.UserState as string);

    }

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我试过了，没用，循环只会用一次，然后停止