エラーが発生した場合にbackgroundworkerで関数を再度呼び出す方法

Question

backgroundworkerで非常に長いコードを実行していますが、ネットワーク上の問題が発生し、webexceptionが表示されることがあります。例外ブロック、私はそれをキャンセルした後、同じbackgroundworker上で再び関数を呼び出そうとしましたが、私はそれを正しくやっていないようです

私のコードを確認してください、それは本当に長いので、それは 十分でない場合には、事前

public static DataSet ds_input; 
    private void btn_process_Click(object sender, EventArgs e) 
    { 
     //some code here to fetch data and call backgroundworker 
     backgroundWorker1.RunWorkerAsync(ds); 
    } 

    private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e) 
    {    
     //ds_input is a dataset with data in it 
       e.Result = check_number(ds_input); 
    } 

    private void backgroundWorker1_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e) 
    { 
      int i = e.ProgressPercentage; 
      int j = showProgress(i, Total_Record); 
      lbl_counter.Text = "Processing " + Convert.ToString(i + 1) + "/" + Convert.ToString(Total_Record) + " "; 
    } 

    private void backgroundWorker1_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e) 
    { 

      DataTable dt = e.Result as DataTable; 
      Grid_records.DataSource = e.Result; 
    } 

    public void check_number(DataSet ds) 
    { 
     try 
     { 
      // logic here to perform execution 
      //sometime it break due to internet connectivity 
      // i want to resume it in catch block 
     } 
     catch (System.Net.WebException ex) 
     { 

      //how to run backgroundWorker1 here again 
      // i did this 
      backgroundWorker1.CancelAsync(); 
      backgroundWorker1.Dispose(); 
      backgroundWorker1.RunWorkerAsync(ds_input); 
      // but it says -This BackgroundWorker is currently busy and cannot run multiple tasks concurrently. 
      //how to resume the function on same backgroundWorker1 
     } 
     finally 
     { 
     } 
    } 
} 

Answer 1

私が調整します（私はそのような場合には知らせて）バックグラウンドワーカーを再実行する必要がないような方法で実行ロジックを実行しますが、その結果が期待どおりでない場合は操作を再実行します。おそらくこのようなもの：

public static DataSet ds_input; 
    private void btn_process_Click(object sender, EventArgs e) 
    { 
     //some code here to fetch data and call backgroundworker 
     backgroundWorker1.RunWorkerAsync(ds); 
    } 

    private void backgroundWorker1_DoWork(object sender, System.ComponentModel.DoWorkEventArgs e) 
    {    
     bool success = false; 

     do 
     { 
      try 
      { 
       e.Result = check_number(ds_input); 
       success = true; 
      } 
      catch (System.Net.WebException ex) 
      { 
       success = false; 
      } 

     }while(!success); 
    } 

    private void backgroundWorker1_ProgressChanged(object sender, System.ComponentModel.ProgressChangedEventArgs e) 
    { 
      int i = e.ProgressPercentage; 
      int j = showProgress(i, Total_Record); 
      lbl_counter.Text = "Processing " + Convert.ToString(i + 1) + "/" + Convert.ToString(Total_Record) + " "; 
    } 

    private void backgroundWorker1_RunWorkerCompleted(object sender, System.ComponentModel.RunWorkerCompletedEventArgs e) 
    { 

      DataTable dt = e.Result as DataTable; 
      Grid_records.DataSource = e.Result; 
    } 

    public DataTable check_number(DataSet ds) 
    { 
     // Do whatever is needed 
    } 
}