Problem when calling WCF Service From Domain Service class in Silverlight Business Application

Question

0.00/5 (No votes)

See more:

Hello to everybody.

I have one problem. I have created new Silverlight Business Application project and added Domain Service Class in web project part. Now I want to write one method in Domain Service Class that returns IQueryable<myclass> and use it from Silverlight projects Client side. The data should be taken from remote WCF Service (hosted in IIS) and "myWcfClass" is also defined there (with SerializableAttribute and [Key] specified).

The method of Remote Service Class looks like this one:

C#

public IQueryable<mywcfclass> GetSomeList()
{
//this does not work because of GetmyWcfClass method returns myWcfClass[] type instead of List<mywcfclass>. is there any deal with it ???
       List<mywcfclass> = new Service1Client().GetmyWcfClass();
       . . . . . .
}</mywcfclass></mywcfclass></mywcfclass>

It does not matter what code is inside this method, when the compiler sees myWcfClass (through Web Service Reference I created for WCF Web Service) it shows the error:

Entity 'myBusinessApp.Web.RefRemoteWebService.myWcfClass' has a property 'ExtensionData' with an unsupported type.

I want to get something like this to work:

C#

[Query]
public IQueryable<mywcfclass> GetSomeList()
{
     List<mywcfclass> lst = new Service1Client().GetmyWcfClass();
     return lst.AsQueryable();
}</mywcfclass></mywcfclass>

With regards
Any help would be highly appreciated

Posted 16-Jul-10 9:07am

gioa44

Updated 17-Jul-10 3:27am

v4

Add a Solution

3 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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

Martin Jarvis · Answer 1 · 2010-07-16T11:54:00

Tragically, I don't think that will work. WCF will rely in having a serializable output from the method and IQueryable won't be. I'm afraid you can't really defer execution across a serialization boundary.

You could use IEnumerable<>, but when you generate your proxy you'll need to select how that will be exposed (Array or Generic List). If you pick generic list, you should be able to use the IQueryable methods again.

gioa44 · Answer 2 · 2010-07-16T23:36:00

Thank you for your answer, maybe I not declared my problem well. and my code also is not showed exactly by this site. I'm using IQueryable<myclass> generic class, that was not shown.

C++

public IQueryable<myClass> GetSomeList()

this method is not defined in WCF Service, but exists in Domain Service Class, WCF Service returns just

C++

List<myClass>

(myClass resides in WCF), but in proxy myClass looks like different (there is ExtensionData of type System.Runtime.Serialization.ExtensionDataObject added for additional information) and Silverlight can't understand it as supported type for entities, to transfer it to Silverlight client

And also I want to tell that similar method

C++

public IQueryable<myLocalClass> GetSomeList()

Declared in Domain Service Class works fine and is transfered to Silverlight Client side well (myLocalClass is declared absolutely in the same way myClass in WCF Service is, but it resides within Domain Service Class's assembly)

gioa44 · Answer 3 · 2010-07-17T09:31:00

Solution 3

Ok, thank you very much everyone who tried to help or red my post. I solved this problem by just removing ExtensionData property from generated proxy version of my myClass type

Posted 17-Jul-10 9:31am

gioa44

Problem when calling WCF Service From Domain Service class in Silverlight Business Application

3 solutions

Solution 1

Solution 2

Solution 3

Add your solution here

Preview 0