How do i use WCF RIA by SOAP-OData-Json via Silverlight 4 - WP7 Client?

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Hi guys,

I had a domain services (build in Silverlight Business Application Web) the Silverlight App local (e.g TestAppSilverlight and TestAppSilverlight.Web) is ok which I can implement CRUD method. (but I can't async this app !!!)

But when I deploy this domain services via SOAP-ODATA-JSON for another Silverlight App ,i got big problem when implement this service (with SOAP-VS 2010 debug some error inside the sevice,with ODATA-JSON are ok) and when I retrieve some record (via ODTA-JSON) i got message from IE like that :

===========
Webpage error details
User Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.0; Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1) ; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; .NET4.0E) Timestamp: Wed, 20 Apr 2011 03:27:25 UTC
Message: Unhandled Error in Silverlight Application Silverlight does not enable you to directly enumerate over a data service query. This is because enumeration automatically sends a synchronous request to the data service. Because Silverlight only supports asynchronous operations, you must instead call the BeginExecute and EndExecute methods to obtain a query result that supports enumeration. at System.Data.Services.Client.DataServiceQuery1.System.Collections.Generic.IEnumerable<TElement>.GetEnumerator() at System.Collections.Generic.List1..ctor(IEnumerable1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable1 source) at SilverlightClient.MainPage..ctor() at SilverlightClient.App.Application_Startup(Object sender, StartupEventArgs e) at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args) at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName) Line: 1 Char: 1 Code: 0
================

What should I do now :( ?
Please help me.

Posted 20-Apr-11 0:16am

appxdev

Updated 20-Apr-11 4:13am

Sandeep Mewara

v2

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Comments

Mark Salsbery 8-Jul-11 12:34pm

This doesn't look like a sync/async issue at all. It looks like you are trying to execute code on the client which should be done on the server end.

2 solutions

Solution 2

Posted 6-Jul-11 22:45pm

ServerYang

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Bruno Tagliapietra · Accepted Answer · 2011-04-22T04:02:00

Solution 1

You can't enumerate (do a foreach) on some collection.

Try doing a "var myNewCollection = yourCollection.ToList();" first and enumerate on that.

Posted 22-Apr-11 4:02am

Bruno Tagliapietra

Comments

appxdev 22-Apr-11 11:16am

Not simple like that.
Do you know you must do sync or async for this problem?
I posted on .NET 4rum and some technician helped me resolve that problem (you can see more here http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/1ce9a4d1-4a30-44ae-83de-be6661cd4829 )
But i still confuse when develop CRUD (Retrieve is Ok) for Silverlight Client WCF RIA ( not for the Silverlight Client with same solution of Domain Service - it's simple!)

Bruno Tagliapietra 22-Apr-11 11:46am

The problem under the hood is that Silverlight can't call web services synchronously.
You must access the service asynchronously.
Have a look here for example http://msdn.microsoft.com/en-us/library/ms730059.aspx

appxdev 22-Apr-11 12:14pm

Yes.
I follow this link to resolve that call service synchronously and add the clientaccesspolicy.xml to client app.
Can you give me some sample for CRUD synchronously.
Thanks

Bruno Tagliapietra 22-Apr-11 12:35pm

Probably, it's me... to my knowledge, you can't call any SOAP service from a Silverlight client in a synchronous way.

But someone says you can:
http://www.codeproject.com/KB/silverlight/SynchronousSilverlight.aspx

read his article, try his code and/or ask him directly

appxdev 22-Apr-11 21:37pm

I agree with you - i can't call any method from my Domain Service for CRUD function .
Thanks for your advice.