make download resumable using c#

Question

I am using this method (WebClient Class) for downloading a file from the Internet :

private Task DownloadUpdate(string url, string fileName)
{
       var wc = new WebClient();
       return wc.DownloadFileTaskAsync(new Uri(url), @"c:\download" + fileName);
}

How can I make the download resumable using the above code?

See the Range headers (related: http://stackoverflow.com/questions/1434647/using-the-http-range-header-with-a-range-specifier-other-than-bytes). I'm not sure if WebClient has any standard support for dealing with Range (or the response Content-Range) headers which are required for HTTP downloading resuming - in which case, seek a different library/wrapper :D — user2246674, Jul 22 '13 at 20:54
Here is another overview http://stackoverflow.com/questions/1336203/httpwebrequest-or-webrequest-resume-download-asp-net (I guess WebClient does support basic range wrapping; but you'll still be required to correctly send and handle the range data) and even more of an implementation http://stackoverflow.com/questions/16270216/download-large-file-from-http-with-resume-retry-support-in-net .. its amazing what a little searching can do (found via "C# web client resume download"). — user2246674, Jul 22 '13 at 20:56

score 6 · Accepted Answer · edited May 23 '17 at 12:32

6

From HttpWebRequest or WebRequest - Resume Download ASP.NET:

Resuming files is done by specifying the byte range of the file you would like to download using the Range HTTP header. This can be done in .NET with the HttpWebRequest.AddRange function.

For example:

request.AddRange(1000);

edited May 23 '17 at 12:32

Community

1
1

answered Aug 22 '13 at 07:19

Sirwan Afifi

10,654
14
63
110

make download resumable using c#

1 Answers1

Linked