Silverlight 2 Beta 2: ConfigUnrecognizedElement issue and Fix

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When you create a Service Reference in a Silverlight App to an ASMX WebService, you may get the: 

"An unhanded exception ('Sys.InvalidOperationException: ManagedRuntimeError error #4004 in control 'Xaml1': System.InvalidOperationException: ConfigUnrecognizedElement at System.ServiceModel.Configuration.BindingsSection.ReadXml(XmlReader reader)"

Exception. This "is a real bug".  When your Visual Studio 2008 Silverlight app generates the ServiceReferences.ClientConfig file, it creates a customBinding section that it cannot parse. In fact even the IDE marks the customBinding tag with squiggles saying "The element 'bindings' has invalid child element 'customBinding'. List of possible elements expected: 'basicHttpBinding'."

This is because SIlverlight doesn't understand SOAP 1.2, which is the default for ASMX webservices. DUH! To fix, you can do this with WCF:

<customBinding>
<binding name="myBinding">
<textMessageEncoding messageVersion="Soap11"/>
<httpTransport/>
</binding>
</customBinding>

Or, with ASMX, you can do this:

<webServices >
<protocols>
<remove name="HttpSoap12"/>
</protocols>
</webServices>

 

Those of course would be in your server-side web.config file.

The problem here is that the tools are creating a custom binding that is unnecessary and improper. If Silverlight can't support SOAP 1.2  then the tools should not be creating this binding. Silverlight should also ignore any bindings it doesn't know about.

WCF is great, but for simple deployment and auto-documentation in the service discovery page, I still prefer ASMX.

 

FACTOID:  Count Basie would be 100 years old today. The guy made a huge contribution to American Jazz, and dozens of jazz greats came out of his band. Here’s a clip of his band doing Neil Hefti’s “Lil Darlin’”:

BTW - it was Neil Hefti who wrote the original Batman theme.

Peter has been active on the C# and other MS newsgroups, has had samples at gotdotnet.com (now codegallery.com) that have been downloaded over 56,000 times, and has written numerous articles for eggheadcafe.com, for which he is a co-founder, and MSDNAA sites. He has also been a technical reviewer on books from Prentice Hall, Manning and other publishers. Peter was a Microsoft MVP for 10 years. Peter was born and raised in New York City, and after a stint as a jazz musician playing contrabass with the Robert Hunt Trio, migrated to sunny Florida, where he was hired as a rookie Financial Consultant at Merrill Lynch in Orlando, specializing in Corporate Services. It was at Merrill that Peter realized computers and technology were his forte. He spent his last few years at Merrill developing real – time computerized trading and and stock charting program using advanced technical analysis indicators, some of which are his own inventions. In 1997, he moved on to architect and serve as lead developer on a number of innovative web-based and middleware solutions for the healthcare and financial services industry.

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