如何调试“安全句柄已关闭”错误

我继承的代码不断崩溃,并出现以下错误(根本没有更改):

System.ObjectDisposedException: Safe handle has been closed
   at Microsoft.Win32.UnsafeNativeMethods.GetOverlappedResult(
          SafeFileHandle hFile, NativeOverlapped* lpOverlapped, 
          Int32& lpNumberOfBytesTransferred, Boolean bWait)
   at System.IO.Ports.SerialStream.EventLoopRunner.WaitForCommEvent()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.runTryCode(Object userData)
   at System.Runtime.CompilerServices.RuntimeHelpers.
          ExecuteCodeWithGuaranteedCleanup(
          TryCode code, CleanupCode backoutCode, Object userData)
   at System.Threading.ExecutionContext.RunInternal(
          ExecutionContext executionContext, ContextCallback callback, 
          Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, 
          ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

这只会在以前的开发人员添加 AppDomain.UnhandledException Event .

如果我删除它,应用程序就会崩溃,显示一条Dr Watson消息(发送反馈等),而不是通常的.NET对话框(带有Continue选项和堆栈跟踪)。

我查过了,它与 Thread.Abort

我该如何从堆栈跟踪中寻找这个问题的原因,而不是在应用程序的代码中?