FtpWebRequest ListDirectory 方法在到达末尾之前停止

Question

我正在使用以下代码列出我的 FTP 服务器上目录中的文件。但是，服务器上有 2,914 个文件，但以下代码在读取了大约 300 个文件后停止。有时它会抛出以下错误：

The remote server returned an error: (450) File unavailable (e.g., file busy).

但大多数时候它不会抛出错误，它只是像读完所有内容一样停止。

这是我正在使用的代码。

Dim request As FtpWebRequest = DirectCast(WebRequest.Create(new_path), FtpWebRequest)
request.UseBinary = True
request.EnableSsl = True
request.Method = WebRequestMethods.Ftp.ListDirectoryDetails 
request.Credentials = New NetworkCredential("name", "password")
Dim response As FtpWebResponse = DirectCast(request.GetResponse(), FtpWebResponse)
Dim responseStream As Stream = response.GetResponseStream
Dim number_of_files As Integer = 0

dirlist.Clear()
Try
   Using reader As New StreamReader(responseStream)
     Do While reader.Peek <> -1
        Dim filename = reader.ReadLine
        dirlist.Add(filename)
        number_of_files += 1
     Loop
   End Using
Catch ex As Exception
  add_to_log(log_window, "Error : " + ex.ToString)
End Try
response.Close()

add_to_log(log_window, "Files Found : " + number_of_files.ToString)

我不明白为什么它在到达列表末尾之前就停止了。

Answer 1

这基本上是 VB.NET 的变体 .

Peek条件错误。只要暂时没有数据可供读取，它就会中断循环。

使用此代码：

Using reader As New StreamReader(responseStream)
    While True
        Dim filename As String = reader.ReadLine()
        If filename Is Nothing Then
            Exit While
        Else
            dirlist.Add(filename)
            number_of_files++
        End If
    End While
End Using

FtpWebRequest ListDirectory 方法在到达末尾之前停止

FtpWebRequest ListDirectory method stopping before reaching the end

.net

vb.net

ftp

stream

ftpwebrequest