Question

我对c＃中的线程控制没有全面的了解。我想在运行方法时创建进度条。

我有两种形式：

Form1是运行应用时显示的表单。它有一个名为btnScrape的按钮。单击该方法时，应调用该方法，并显示带有进度条的表单。在进度条完成之前，应对用户禁用Form1。
ProgressBarForm - 这里面有进度条和标签。

代码如下。

   //In Form1.cs I have a button.
      private void btnScrape_Click(object sender, EventArgs e)
    {
            //gather data for folloeing parameters from the form.
             Controller cntrlr = new Controller(urlFilePath, destinationPath, destinationfilename,cmbDepth.SelectedIndex);

            cntrlr.Vmain(); // this is the method in controller class. while this is running i want show the progress bar.
    }

   // in Contrller class     
    class Controller{
          List<string> urlList = null; 
          URLFileReader urlFileReader = null;
          HTTPWorker httpWorker = null;
          SourceReader srcreader = null;
          ReportWriter reportWriter = null;

           string urlFilePath, destinationPath, destinationFileName;
           int depth;

    public Controller(string urlFilePath,string destinationPath,string destinationFileName,int depth)
    {
        this.urlFilePath = urlFilePath;
        this.destinationPath = destinationPath;
        this.destinationFileName = destinationFileName;
        this.urlList = new List<string>();
        this.urlFileReader = new URLFileReader();
        this.httpWorker = new HTTPWorker(this.destinationPath);
        this.reportWriter = new ReportWriter(this.destinationPath,this.destinationFileName);
        this.srcreader = new SourceReader(this.reportWriter);
        this.depth = depth;

    }

       //this is the method
         public void Vmain(){

              this.urlFileReader.ReadURL(urlFilePath);
              this.urlList = urlFileReader.geturlList();           

              string pageSrc;

                foreach (string requestUrl in urlList)
                {
                   //do sruff for requestUrl
                   //the progressbar should move as the urlList iterate.
                   //additionally i want the label on the top of progress bar to     display the current "requestUrl"
                   //as the urlList is over i want quit from the progressbar window and come back to Form1. Till the progrss bar is completed Form1 should be disabled for the user.

                }

         }



    }

请解释那里发生的事情并尽可能提供有效的代码。先感谢您。没有任何完美的答案对我有用，即使我花了两天时间。我尝试使用BackgroundWorker和线程。但没有找到解决方案。：（

Answer 1

在主窗体中，您可以使用以下代码：

    private Progressfrm _loadForm;
    private void ShowProgress()
    {
        ToggleForm();
        _loadForm = new Progressfrm();
        _loadForm.ShowDialog();
        var tcheck = new Thread(CheckLoadedProgress);
        tcheck.Start();
        //do stuff here
    }
    private void CheckLoadedProgress()
    {
        while (_loadForm.IsAccessible) { }
        ToggleForm();
    }
    private void ToggleForm()
    {
        Invoke(new Action(() => Enabled = !Enabled));
    }
    private void btnScrape_Click(object sender, EventArgs e)
    {
        var tform = new Thread(ShowProgress);
        tform.Start();
    }

然后进度 - Form将一直显示，直到它被填充：

    private ProgressBar _progressBar;
    private void Progressfrm_Shown(object sender, EventArgs e)
    {
        _progressBar = new ProgressBar { Size = new Size(100, 20), Location = new Point(10, 10) };
        Controls.Add(_progressBar);
        _progressBar.Show();
        Refresh();
        LoadProgress();
    }
    private void LoadProgress()
    {
        while (_progressBar.Value < 100)
        {
            _progressBar.Value++;
            Thread.Sleep(100);
        }
        Close();
    }

在此表单上，您必须添加事件Shown并添加代码，如我的示例中所示。希望这会有所帮助。

Answer 2

使用BackgroundWorker类输出progressBar和statusLabel更改：

BackgroundWorker bgw;
private void btnScrape_Click(object sender, EventArgs e)
{
  bgw = new BackgroundWorker();
  bgw.WorkerReportsProgress = true;
  bgw.DoWork += new DoWorkEventHandler(bgw_DoWork);
  bgw.ProgressChanged += new ProgressChangedEventHandler(bgw_ProgressChanged);
  bgw.RunWorkerAsync();
}

void bgw_DoWork(object sender, DoWorkEventArgs e)
{
  for (int i = 1; i <= 100; i++)
  {
    Thread.Sleep(100);
    bgw.ReportProgress(i);
  }
}

private void bgw_ProgressChanged(object sender, ProgressChangedEventArgs e)
{
  progressBar1.Value = e.ProgressPercentage;
}

这只是一个如何以异步方式更新控件的示例。

在c＃中使用Background Controller运行进度条

2 个答案: