如何检查HttpWebRequest上传的进度？

Question

I wonder how do I check how much of a file has been uploaded/downloaded? I am using HttpWebRequest

Answer 1

You can do this is you use async mode on the HttpWebRequest - there is a working sample (based on the MSDN doc sample code) here . Brief description:

Here's a little Win Forms client that allows you to download a single file from a server, using either HTTP or FTP. It shows download progress and displays the average transfer rate, in kb/sec. It also demonstrates how to use the HttpWebRequest and FtpWebRequest classes in System.Net to do file downloads.

Answer 2

As long as you set either HttpWebRequest.ContentLength or HttpWebRequest.SendChunked before calling GetRequestStream, the data you send will be sent to the server with each call to Stream.[Begin]Write. If you write the file in small chunks suggests, you can get an idea of how far along you.

Answer 3

You have to call it asynchronously to update the progress of your upload/download.

HttpWebRequest have methods like

public override IAsyncResult BeginGetResponse(AsyncCallback callback, object state);
public override IAsyncResult BeginGetRequestStream(AsyncCallback callback, object state);

accepting asynchronous callbacks.