如何通过vb.net中的HTTP帖子发布文件

Question

在vb.net中通过HTTP post发送文件时遇到问题.我试图模仿以下HTML,所以vb.net做同样的事情.

<form enctype="multipart/form-data" method="post" action="/cgi-bin/upload.cgi">
File to Upload:
<input type="file" name="filename"/>
<input type="submit" value="Upload" name="Submit"/>
</form>

希望有人可以帮忙!

Answer 1

我认为您要求的是能够从VB.Net Winforms应用程序将文件发布到Web服务器cgi脚本.

如果是这样,这应该对你有用

Using wc As New System.Net.WebClient()
    wc.UploadFile("http://yourserver/cgi-bin/upload.cgi", "c:\test.bin")
End Using

Answer 2

如果UploadFile(如OneShot所说)无效,您可以使用HttpWebRequest. HttpWebRequest作为更多粒度的凭证选项等

   FileStream rdr = new FileStream(fileToUpload, FileMode.Open);
   HttpWebRequest req = (HttpWebRequest)WebRequest.Create(uploadUrl);
   req.Method = "PUT"; // you might use "POST"
   req.ContentLength = rdr.Length;
   req.AllowWriteStreamBuffering = true;

   Stream reqStream = req.GetRequestStream();

   byte[] inData = new byte[rdr.Length];

   // Get data from upload file to inData 
   int bytesRead = rdr.Read(inData, 0, rdr.Length);

   // put data into request stream
   reqStream.Write(inData, 0, rdr.Length);

   rdr.Close();
   req.GetResponse();

   // after uploading close stream 
   reqStream.Close();

Answer 3

你可以使用

例如：

In ASPX:
<Asp:FileUpload id="flUpload" runat="Server" />

In Code Behind:
if(flUpload.HasFile)
{
  string filepath = flUpload.PostedFile.FileName;
  flUpload.PostedFile.SaveAs(Server.MapPath(".\\") + file)
}