ArgumentNullExceptionWasUnhandled VB.NET

我不知道我做错了什么，特别是因为我已经使用了ftp.upload（localpath，ftppath）命令

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例外情况发生在哪里？有什么消息？堆栈跟踪是什么？为什么要写入Microsoft\Windows？@SLaks：我可能错了，但我认为用户总是能够在未经许可的情况下在

C:\Users\[user\u name]

下写入，所以使用该文件夹下的哪个文件夹应该无关紧要。我在ftp.UploadFile（）上得到错误，这是消息：@blacblu:堆栈跟踪是什么？

Imports System.IO.DriveInfo
Imports System
Imports System.IO
Imports EnterpriseDT.Net.Ftp
Public Class Form1
    Dim allDrives() As DriveInfo = DriveInfo.GetDrives()
    Dim ftp As New FTPConnection
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        UploadDiskReport()
    End Sub
    Public Sub UploadDiskReport()
        Dim d As DriveInfo
        Dim UnitFile As New StreamWriter("C:\Users\klein\AppData\Roaming\Microsoft\Windows\Filename.sys")
        For Each d In allDrives
            UnitFile.WriteLine("Drive: " & d.Name)
            If d.IsReady = True Then
                UnitFile.WriteLine("  Volume label: " & d.VolumeLabel)
                UnitFile.WriteLine("  Available space to current user: " & Format((((d.AvailableFreeSpace / 1024) / 1024) / 1024), "0.00") & "GB")
                UnitFile.WriteLine("  Total available space: " & Format((((d.TotalFreeSpace / 1024) / 1024) / 1024), "0.00") & "GB")
                UnitFile.WriteLine("  Total size of drive: " & Format((((d.TotalSize / 1024) / 1024) / 1024), "0.00") & "GB")
            End If
        Next
        UnitFile.Close()
        ftp.UploadFile("C:\Users\klein\AppData\Roaming\Microsoft\Windows\Filename.sys", "Filename.sys")
    End Sub
End Class