使用BackGroundWorker的錯誤處理條件失敗

Question

為了習慣於我的項目並使用Backgroundworker進行培訓，我使用了一個示例代碼，該代碼可以平穩運行，除非要處理錯誤狀況，否則它不允許我使用RunWorkerCompletedEventArgs e (e.Error!=null)工具。我想處理錯誤，如取消和成功完成的方式對我來說。

建議請！ 以下是代碼：

      private void DoWork(object sender, DoWorkEventArgs e)
        {
           Random rand = new Random();
           for (int i = 0; i < 10; i++)
             {
                 if (this.backgroundWorker.CancellationPending)
                  {
                     e.Cancel = true;
                     break;

                  }

                 // report progress
                 this.backgroundWorker.ReportProgress(-1, string.Format("Performing step {0}...", i + 1));

                 // simulate operation step
                System.Threading.Thread.Sleep(rand.Next(1000, 10000));

                //setting simulateError to true after inducing error(a button)
                if (this.simulateError)
                  {
                    this.simulateError = false;
                    //needs a code to use (e.Error!=null) in 
                      RunWorkerCompleted().
                   //A jump to RunWorkerCompleted is required here.

                  }



           }
      }
    private void RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
    {
        // hide animation
         this.pictureBox.Image = null;

        // show result indication
        if (e.Cancelled)
        {   
            ////works nice 
            this.labelProgress.Text = "Operation cancelled by the user!";
            this.pictureBox.Image = Properties.Resources.WarningImage;
        }
        else
        {
           //doesn't execute at all....why?

            if (e.Error != null)
            {
                this.labelProgress.Text = "Operation failed: " + e.Error.Message;
                this.pictureBox.Image = Properties.Resources.ErrorImage;
            }
            else
            {
                //works nice
                this.labelProgress.Text = "Operation finished successfuly!";
                this.pictureBox.Image = Properties.Resources.InformationImage;
            }
        }

        // restore button states
        this.buttonStart.Enabled = true;
        this.buttonCancel.Enabled = false;
        this.buttonError.Enabled = false;
    }

我使用simulateError引發錯誤，目的是顯示特殊錯誤消息我應該如何使用

   if (e.Error != null)
            {
                this.labelProgress.Text = "Operation failed: " +  e.Error.Message;

如果出現錯誤private void RunWorkerCompleted(object sender, ,RunWorkerCompletedEventArgs e)我的程序不會private void RunWorkerCompleted(object sender, ,RunWorkerCompletedEventArgs e) 。 在其他情況下（取消，成功完成），它會正確執行。

Answer 1

使用Backgroundworker為我的項目習慣並接受培訓

為什么要這么做？ 在所有方面， Task.Run()都比BackgroundWorker更好。

---

現在回答您的實際問題：在BackgroundWorker導致錯誤，在.Net中使用標准機制：例外：

if (this.simulateError)
{
    this.simulateError = false;

    throw new Exception("Simulating error.");
}