IOException
   在 System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   在 System.Threading.EventWaitHandle.Set()
   在 System.IO.Pipes.PipeStream.AsyncPSCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOverlapped)
   在 System.Threading._IOCompletionCallback.PerformIOCompletionCallback(UInt32 errorCode, UInt32 numBytes, NativeOverlapped* pOVERLAP)

IOException: 句柄无效。

StackTrace:
   在 System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   在 System.Threading.EventWaitHandle.Set()
   在 System.Windows.Threading.DispatcherOperation.DispatcherOperationEvent.OnCompletedOrAborted(Object sender, EventArgs e)
   在 System.Windows.Threading.DispatcherOperation.Invoke()
   在 System.Windows.Threading.Dispatcher.ProcessQueue()
   在 System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   在 MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   在 MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   在 System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   在 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)