[C#] Access is denied - 除錯心得

NET stack trace:

System.ComponentModel.Win32Exception: Access is denied
   at System.Diagnostics.NtProcessManager.GetModuleInfos(
      Int32 processId, Boolean firstModuleOnly)
   at System.Diagnostics.NtProcessManager.GetFirstModuleInfo(
      Int32 processId)
   at System.Diagnostics.Process.get_MainModule()

My code snippet:

  process.Kill();
  process.WaitForExit();
  logger.Info(process.MainModule.FileName + " is killed.");

發現問題了嗎？The Kill() method executes asynchronously. After calling the Kill() method, call the WaitForExit() method to wait for the process to exit. 所以問題出在第三行: process.MainModule.FileName. 當 process 死掉之後，.NET 的 Process object 也會一起死掉。

因此正確的 code snippet 是:

  String process_filename = process.MainModule.FileName;
  process.Kill();
  process.WaitForExit();
  logger.Info(process_filename + " is killed.");

這樣就能解決 Access is denied 的問題。