ASP.NET/VB.NET 文件上传控件

Question

我的 FileUpload 有问题，当我从本地计算机选择文件时，它不会带来文件的真实路径，它会使用项目文件的路径并假设我选择的文件在那里，有什么想法吗？

例子： 文件名为“Q.JPG”，位于“C:\”中 当我浏览到“C:\”并选择“Q.JPG”并单击“打开”时，出现以下错误 找不到文件“C:\Program Files\Microsoft Visual Studio 8\Common7\IDE\q.jpg”。 例如，当我启动将文件上传到 FTP 的代码时，它将返回错误，因为文件不存在

HTML 端：

<asp:FileUpload ID="FU" runat="server" Height="24px" />

下面是 VB 代码：

Protected Sub btnUpload_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnUpload.Click

    If FU.PostedFile IsNot Nothing AndAlso FU.PostedFile.FileName <> "" Then
        Dim MaxSize As Integer = FU.PostedFile.ContentLength
        If MaxSize > "2097152" Then
            lblUpload.Text = "The file size cannot exceed 2 MB"
            btnSave.Focus()
            GoTo 99
        End If


        '--------------------------
        ' set up request...
        Dim LocFile As String = FU.PostedFile.FileName
        Dim clsRequest As System.Net.FtpWebRequest = DirectCast(System.Net.WebRequest.Create("ftp://myftp.com/" & LocFile), System.Net.FtpWebRequest)
        clsRequest.Credentials = New System.Net.NetworkCredential("username", "password")
        clsRequest.Method = System.Net.WebRequestMethods.Ftp.UploadFile

        ' read in file...
        Dim bFile() As Byte = System.IO.File.ReadAllBytes(FU.PostedFile.FileName)

        ' upload file...
        Dim clsStream As System.IO.Stream = clsRequest.GetRequestStream()
        clsStream.Write(bFile, 0, bFile.Length)
        clsStream.Close()
        clsStream.Dispose()
        '--------------------------


        lblUpload.Text = "Uploaded"
        btnSave.Focus()
    Else
        lblUpload.Text = "Choose a file to upload"
        btnSave.Focus()
    End If

99: 'Do Nothing

End Sub

Answer 1

问题是您尝试将 PostedFile 作为本地文件（在 Web 服务器上）读取，而不是从附加到 FileUploader 的 HttpPostedFile 对象读取。

尝试：

Dim objFileStream As System.IO.Stream = FU.PostedFile.InputStream
Dim bFile(objFileStream.Length) As Byte
objFileStream.Read(bFile, 0, objFileStream.Length)

Answer 2

我尝试了一些东西，它起作用了..

            FU.SaveAs("C:\" & FU.FileName)

            '--------------------------
            ' set up request...

            Dim LocFile As String = FU.PostedFile.FileName
            Dim clsRequest As System.Net.FtpWebRequest = DirectCast(System.Net.WebRequest.Create("MyFTP.com" & LocFile), System.Net.FtpWebRequest)

            clsRequest.Credentials = New System.Net.NetworkCredential("username", "password")
            clsRequest.Method = System.Net.WebRequestMethods.Ftp.UploadFile

它起作用了..只需将文件从 FU (FileUpload) 保存到 C:\ ，然后将地址设置为始终从 C:\ 开始