How To download from ftp site using http client

Question

I cannot find a SIMPLE EXAMPLE anywhere that shows how to use (recommended) HTTPCLIENT to replace the now OBSOLETE WebCclient, WebRequest etc.

I cannot find a SIMPLE EXAMPLE anywhere that shows how to use (recommended) HTTPCLIENT to replace the now OBSOLETE WebCclient, WebRequest etc.

I am trying to update an older (2017) Visual Studio project using "windows forms app" template with "Net 6.0 (long term support) and all I get is grief (errors and warnings) for the FTP segments of my coding ( FtpWebRequest, FtpWebResponse, etc.). All the help I get is "USE HTTPLCIENT INSTEAD" which is a nice suggestion if I could find an example thereof to replace the snippets below. I do not need multiple files, progress reports, etc. which seem to obscure the download coding.

Please HELP.

Just a simple example including uri construction, Httpclient, 'GET" logic coding and other stuff (that's a technical term meaning whatever) that I might need and use.

THANK YOU!

  Private ftpQuest As FtpWebRequest 

  '.....

  ftpQuest = CType(WebRequest.Create("ftp://ftps0.mywebsource.com/myload-source/" & 

               myfilename.txt), FtpWebRequest)

  ftpQuest.Credentials = "MyUserName:MyPaassowrd"

  ftpQuest.Method = WebRequestMethods.Ftp.DownloadFile

  Try

    ftpReply = CType(ftpQuest.GetResponse, FtpWebResponse)

  '...

  End try

Answer 1

Hi @HowardMontemurro-7208 , Welcome to Microsoft Q&A.

For c#, Httpclient has corresponding examples on the official website.

You can also refer to these two vb cases:HttpWebRequest to HttpClient post Request and VB.net POST method using HTTPclient

The following vb httpclient code is for reference only:

Private Async Sub DownloadFileFromFtp()
    Dim ftpUrl As String = "ftp://ftps0.mywebsource.com/myload-source/myfilename.txt"
    Dim userName As String = "MyUserName"
    Dim password As String = "MyPassword"

    Using httpClient As New HttpClient()
        Dim credentials As New System.Net.NetworkCredential(userName, password)
        httpClient.DefaultRequestHeaders.Authorization = New System.Net.Http.Headers.AuthenticationHeaderValue("Basic", Convert.ToBase64String(System.Text.Encoding.ASCII.GetBytes($"{userName}:{password}")))
        
        Dim response As HttpResponseMessage = Await httpClient.GetAsync(ftpUrl)

        If response.IsSuccessStatusCode Then
            Using fileStream As IO.FileStream = Await response.Content.ReadAsStreamAsync()
                Using outputFileStream As IO.FileStream = IO.File.Create("path\to\save\downloaded\file\myfilename.txt")
                    Await fileStream.CopyToAsync(outputFileStream)
                End Using
            End Using

            ' File downloaded successfully.
            MessageBox.Show("File downloaded successfully.")
        Else
            ' Handle the case when file download fails.
            MessageBox.Show($"File download failed. Status code: {response.StatusCode}")
        End If
    End Using
End Sub

Best Regards,

Jiale

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