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WCF Streaming – Slides and code

, 21 Aug 2012 CPOL
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The PowerPoint slides and code for my presentation on WCF streaming.

I held a presentation about WCF Streaming last Saturday, November 26th, at Microsoft HQ Bucharest. I illustrated WCF Streaming in a small client/server application which was supposed to (and in the end implemented it all) :

  • Show all files available on the server in the client application
  • Allow the end user to upload a file (up to 2GB) to the server
  • Allow the user to download a file from the server
  • Display a progress bar that would update in real-time showing the progress of the current transfer (upload or download)
  • Allow the user to press the “Stop” button to stop the current transfer (upload or download)

The code to achieve this in a simple (non-robust, not production quality etc.) manner is quite small : around 50 lines of code for the server and around 200 lines for the client. The WCF runtime takes care of the rest.

Points of interest (things for which I suffered and hopefully you won’t) :

  • Cassini (ASP.NET Web development) server does not support streaming, reports a cryptic (400 Bad request) error and it’s not documented by Microsoft!
  • It’s not enough at the server level to set the maxReceivedMessageSize at the binding element, you must also set it in the maxRequestLength attribute on the system.web/httpRuntime element if you host the service in a site.
  • Don’t try to define an operation with mixed types, that is, complex types that are decorated with MessageContract and any other types (including System.String). If one is MessageContract then all have to be. Found out the hard way, at runtime (not compile time)
  • In order to get the folder path for a WCF application you must use HostingEnvironment.GetApplicationPhysicalPath.
  • In .NET 4 there is a CopyTo method on the Stream class which simplifies copying data from a stream to another.
  • Opt in for asynchronous method generation for the client-side WCF proxies

You can find below the PowerPoint slides and the code archive attached to this post.

WCF Streaming – slides

WCF Streaming – the code


License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Andrei Ion Rînea
Software Developer (Senior) IBM, Business Analytics
Romania Romania
No Biography provided

Comments and Discussions

 
QuestionCancelling file download PinmemberMember 461300214-Nov-12 1:37 
AnswerRe: Cancelling file download PinmemberAndrei Rinea14-Nov-12 4:30 
GeneralRe: Cancelling file download Pinmemberjonasgranlund29-Jul-13 5:07 
QuestionNice work PinmemberMember 794342015-Oct-12 2:25 
AnswerRe: Nice work PinmemberAndrei Rinea15-Oct-12 4:35 
GeneralMy vote of 5 PinmemberChristian Amado21-Aug-12 6:39 
GeneralRe: My vote of 5 PinmemberAndrei Rinea22-Aug-12 3:36 
QuestionSo you just wrapped Stream ? PinmemberJasper4C#21-Aug-12 2:32 
AnswerRe: So you just wrapped Stream ? PinmemberAndrei Rinea21-Aug-12 4:17 
QuestionWWE translation? PinmemberBigTimber@home20-Aug-12 9:09 

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