Comments on: Simple Silverlight Uploader with Progress Bar using HttpRequest or WCF

By: Nathan

Nathan — Tue, 05 Jul 2011 14:03:19 +0000

Hi @Saieesh I believe it does support unlimited files sizes if you remove the size cap in the code. Each chunk is < 4MB per HTTP request, so they just build on each other to any size. It does not have a resume; although with a little creativity, you could probably devise some way to make that work. The data is validated with hashes SHA256 I think. Each individual chunk is hashed and compared to the pre-hash sent with the chunk. Then the full received file data is re-hashed on the server and compared to the hash sent in the final request. It's not very fancy; this was kind of a concept demo when I wrote it. Thanks!

By: Saieesh

Saieesh — Mon, 04 Jul 2011 05:29:17 +0000

Hi, wonderful code. few questions
does it support unlimited file size upload
how do i resume upload in case of interruption from the point of interruption
how does the code validate the uploaded data

By: Nathan

Nathan — Fri, 03 Jun 2011 15:27:09 +0000

@Matthew Blott Haha awesome! Glad it worked!

By: Nathan

Nathan — Fri, 03 Jun 2011 15:26:38 +0000

@YongYong You bet!

By: YongYong

YongYong — Fri, 03 Jun 2011 04:05:21 +0000

this is awesome!
Thanks for the samples!

By: Matthew Blott

Matthew Blott — Tue, 10 May 2011 09:06:43 +0000

Excellent project. I can’t believe I’ve just downloaded a project from the web that’s worked without any problems – that must be a first! I’ve just deployed it to our production server and it still worked. Thanks, much appreciated

By: Nathan

Nathan — Fri, 22 Apr 2011 15:57:22 +0000

@Dmasty
Good catch. That’s likely a bug. I’ll peek at it when I get a chance. If you code the solution, fork the repo and submit a pull request; I’ll be happy to accept it. Here is the github project.

I also built another uploader recently that uses just a regular HTTP Multi-part/form post and had something very similar to this. I’ll be posting the new uploader soon. Things have been pretty busy @ home.

By: Dmasty

Dmasty — Sat, 16 Apr 2011 11:09:20 +0000

i find an message or error on Default.aspx where is called the Uploader.Client. if the user upload the file less that 1Kb then will get “Offset and length were out of bounds for the array or count is greater….” message .. it is error or only a message ?? can the silverlight upload a file less that 1 Kb ?

By: dfcc1970

dfcc1970 — Thu, 16 Dec 2010 18:33:21 +0000

I also modify several cs files, so the application will upload with the same original source filename, and if the file exist it overwrite it at the server.

By: dfcc1970

dfcc1970 — Thu, 16 Dec 2010 18:30:08 +0000

I upgrade the code to Visual Studio 10, I did fix ListItem.xaml.cs the wrong line is:

read = fs.Read(buffer, 0, Utility.chunkSize);

adn should be:

read = fs.Read(buffer, 0, buffer.Length);

I did delete the Solucion so only needed 2 projects,1 for Silverlight and 1 for Web application with WFC services, i also modify the web.config and ServiceReferences.ClientConfig so now you can upload large files (i did test with 260Mb file)
also i did modify utility.cs the line public const int chunkSize = 500000;

So I want to post the final solution but i dunno how. email me dfcc1970@yahoo.com. Thanks