FileStream 要求開啟的裝置並不是一個檔案。為了支援類似 'com1:' 或 'lpt1:' 的裝置，請呼叫 CreateFile，然後使用 FileStream 建構函式將 OS 控制代碼當做 IntPtr 使用。

FileStream was asked to open a device that was not a file. For support for devices like 'com1:' or 'lpt1:', call CreateFile, then use the FileStream constructors that take an OS handle as an IntPtr.