Silverlight 3 WCF Exceptions“Down the Rabbit Hole”

Presented byWilliam Austin

william.austin@solutiondesign.com

Down the Rabbit Hole

“Alice discovers during her travels that things are not what they seem”

Her experiences in Wonderland challenge her understanding of the world.

Static Proxy file generation

WCF

Beh

avio

rs

WebDev Helper

IEndPoint BehaviorReference.cs

HTT

P Tr

affic

sni

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g

Our Rabbit HoleClientAccessPolicy.xml

BehaviorE

xtensionElem

ent

IDispatchMessageInspector

basicHTTPBinding

The service returned an error : Not Found

Code Demo #1

The Happy Path

Summary of Demo

• Importance of clientaccesspolicy.xml• Default wsHTTPBinding

Code Demo #2

Exceptions thrown on the WCF service side.

• WCF FaultException<>• Modifying service, requires Update Service in

client.• Inspect HTTP traffic• Cast e.Error to FaultException<T>• …And it STILL doesn’t work.

Summary of Demo 2

Code Demo 3

• Silverlight is hosted within the browser (mostly…)

• Convert HTTP500 to HTTP200• WCF Behavior, web.config, dynamic • BehaviorExtensionElement,

IEndpointBehavior, and IDispatchMessageInspector are your friends.

Summary of Demo 3

Lessons learned

• WCF FaultException<> and Silverlight3• BehaviorExtensionElement,

IEndpointBehavior, and IDispatchMessageInspector

• Silverlight runs within the browser

Useful Article Links

Understanding WCF Faults in Silverlight 3

http://www.netfxharmonics.com/2009/07/Understanding-WCF-Faults-in-Silverlight-3

Consuming Web Services in Microsoft Silverlight 3

http://videos.visitmix.com/MIX09/T42F (beta 3.0, up to the 30:00 minute mark)

Creating and Handling Faults in Silverlight

http://msdn.microsoft.com/en-us/library/dd470096(VS.95).aspx

Are you mad??

?

“We’re all mad here…”

“If you weren’t mad, you

wouldn’t be here”

Silverlight 3 WCF Exceptions“Down the Rabbit Hole”

Presented byWilliam Austin