vb.net如何将带空格的字符串传递给命令行

我正在尝试使用Process调用外部程序：

Dim strExe As String = "E:\Projects\Common Files\mktorrent.exe"
    Dim p As New Process
    Dim pinfo As New processstartinfo
    pinfo.UseShellExecute = False
    pinfo.RedirectStandardOutput = True
    pinfo.Arguments = " -a http://blah.com/announce.PHP -l " & FileSizeMarker & " " & fn
    pinfo.FileName = strExe
    pinfo.WorkingDirectory = fn.Substring(0,fn.LastIndexOf("\"))
    pinfo.WindowStyle = ProcessWindowStyle.normal
    pinfo.CreateNowindow = True
    p.StartInfo = pinfo
    p.Start()

问题在于文件名(上面的变量fn).如果它有空格,命令会阻塞 – 没有空格,它可以正常工作.我试过添加1,2或3个引号,如下所示：

fn = Chr(34) & Chr(34) & Chr(34) & fn & Chr(34) & Chr(34) & Chr(34)

并且

fn = "\") & Chr(34) & fn & "\"& Chr(34)

和许多其他组合,但它仍然给我一个错误.有关如何让它工作的任何想法？
TIA

请查看以下链接,它在C#中,可能对您有所帮助

Word command-line-arguments space issues