Question

我无法理解此异常的原因：

private void bwWorker_DoWork(object sender, DoWorkEventArgs e)
{
   if (Main.bolDebugMode)
      MessageBox.Show("Function DoWork is called");
   if (Main.ftpsync(Main.strUsername407, Main.strPassword407, sender as BackgroundWorker) == 0)
      e.Result = e.Result + "No error in " + Main.strUsername407;
   else
   {
      if (Main.bolDebugMode)
         MessageBox.Show("Errors in " + Main.strUsername407);
      e.Cancel = true;
      e.Result = e.Result + "Errors in " + Main.strUsername407;
      if (Main.bolDebugMode)
         MessageBox.Show("Errors marked");
      try
      {
         MessageBox.Show("Next step throws exception");
         return;
      }
      catch (Exception error)
      {
          if (error.ToString() != null)
             MessageBox.Show(error.InnerException.Message);
      }
   }
}

抛出此异常：

类型为＆＃39; System.Reflection.TargetInvocationException＆＃39;的未处理异常。发生在mscorlib.dll

中
附加信息：调用目标引发了异常。

目标（据我有限的理解）是后台工作者的RunWorkerCompleted功能：

 private void bwWorker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
        {
            if (Main.bolDebugMode)
                MessageBox.Show("DoWork Completed. Break: " + e.Cancelled + " Error: " + e.Error + " Result: " + e.Result);

            // First, handle the case where an exception was thrown.
            if (e.Error != null)
            {
                lStatus.Text = e.Error.Message;
            }
            else if (e.Cancelled)
                lStatus.Text = "Cancelled: " + e.Result.ToString();
            }
            else
            {
                lStatus.Text = "Done! " + e.Result;
                Thread.Sleep(Convert.ToInt16(Main.strGlobalWaitTime));
                pbProgress.Value = 0;
                lStatus.Text = "";
            }

            if (Main.bolDebugMode)
                MessageBox.Show("Analysis completed");

            // Enable the Start button.
            btnStart.Enabled = true;

            // Disable the Cancel button.
            btnCancel.Enabled = false;
        }

public class Main
{
    #region Variables
    // Variables - FTP Settings
    // Reading tons of variables from a appconfig file like so:
    private static string StrGlobalWaitTime = ConfigurationManager.AppSettings["program_globalWaitTime"]; 
    private static bool BolDeleteRemoteFiles = Convert.ToBoolean(ConfigurationManager.AppSettings["program_deleteremotefiles"]);

    // Configuring the variables to receive and write
    public static string strGlobalWaitTime
    {
        get { return StrGlobalWaitTime; }
        set { StrGlobalWaitTime = value; }
    }
    #endregion

    #region Main function
    public static int ftpsync(string strUsername, string strPassword, BackgroundWorker bwWorker)
    {
        if (Directory.EnumerateFiles(strWorkDirectory, "*.pdf").Any())
        {
            bwWorker.ReportProgress(0, "Files left! Upload not complete");
            Thread.Sleep(Convert.ToInt16(Main.strGlobalWaitTime));
            return 1;
        }

但是，它甚至无法到达第一个调试消息框。因此，它必须在函数的返回和开始之间发生。他是后台工作者不直接移交给RunWorkerCompleted函数吗？谁能告诉我我错过了什么或做错了什么？

这是我的第一个问题。我会尽量提供尽可能多的信息。 Google会搜索最明显的查询。

Answer 1

遇到Razor时要查找的内容是TargetInvocationException属性，它将具有“真实”异常。

从它的外观来看，它很可能与尝试从工作者的线程内部访问GUI有关。请记住，在使用InnerException处理程序时，代码将在与主UI不同的线程中执行。因此，对GUI组件的调用必须通过DoWork调用完成，或者一起避免。

从BackgroundWorker.DoWork返回抛出TargetInvocationException

1 个答案: