VB.NET迭代文件和目录

发布时间：2020-12-17 07:24:35 所属栏目：百科来源：网络整理

导读：我正在研究一个VB.NET程序,它会自动将我的工作备份到我的FTP服务器上.到目前为止,我可以通过使用以下方法指定文件名来上传单个文件： 'relevant part - above is where FTP object is instantiated Dim _FileStream As System.IO.FileStream = _FileInfo.Ope

我正在研究一个VB.NET程序,它会自动将我的工作备份到我的FTP服务器上.到目前为止,我可以通过使用以下方法指定文件名来上传单个文件：

'relevant part - above is where FTP object is instantiated
       Dim _FileStream As System.IO.FileStream = _FileInfo.OpenRead()

            Try
                'Stream to which the file to be upload is written
                Dim _Stream As System.IO.Stream = _FtpWebRequest.GetRequestStream()

                'Read from the file stream 2kb at a time
                Dim contentLen As Integer = _FileStream.Read(buff,buffLength)

                'Till Stream content ends
                Do While contentLen <> 0
                    ' Write Content from the file stream to the FTP Upload Stream
                    _Stream.Write(buff,contentLen)
                    contentLen = _FileStream.Read(buff,buffLength)
                Loop
                _Stream.Close()
                _Stream.Dispose()
                _FileStream.Close()
                _FileStream.Dispose()

                ' Close the file stream and the Request Stream


            Catch ex As Exception
                MessageBox.Show(ex.Message,"Upload Error",MessageBoxButtons.OK,MessageBoxIcon.Error)
            End Try

现在我希望能够遍历目录(包含子目录)并递归调用上面的函数.我在获取目录中的文件时遇到问题.

我的问题是,我如何循环并将每个文件发送到上面的上传功能？我可以将文件名发送到数组,还是有某种系统对象来处理这个(例如System.IO.Directory)

我正在尝试做的伪代码

For Each Sub_directory In Source_directory

                     For Each File in Directory
                       'call the above code to transfer the file
                     Next

                'start next subdirectory
                Next

我正在尝试复制整个目录结构,子目录完好无损.我的第一次尝试将所有文??件转储到一个目录中.

解决方法

您可以使用递归遍历每个目录和文件,如下所示：

Public Shared Sub ForEachFileAndFolder(ByVal sourceFolder As String,_
                                       ByVal directoryCallBack As Action(Of DirectoryInfo),_
                                       ByVal fileCallBack As Action(Of FileInfo))

    If Directory.Exists(sourceFolder) Then
        Try
            For Each foldername As String In Directory.GetDirectories(sourceFolder)
                If directoryCallBack IsNot Nothing Then
                    directoryCallBack.Invoke(New DirectoryInfo(foldername))
                End If

                ForEachFileAndFolder(foldername,directoryCallBack,fileCallBack)
            Next
        Catch ex As UnauthorizedAccessException
            Trace.TraceWarning(ex.Message)
        End Try

        If fileCallBack IsNot Nothing
            For Each filename As String In Directory.GetFiles(sourceFolder)
                fileCallBack.Invoke(New FileInfo(filename))
            Next
        End If
    End If
End Sub

编辑：代表的用法：

ForEachFileAndFolder("yourPath",AddressOf dirAction,Addressof fileAction)

Public Sub dirAction(Byval dirInfo As DirectoryInfo)
    ' do something here '
End Sub

FileAction也是如此.

（编辑：李大同）

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