linq to sql and wcf/ wired problem

Question

hi,

i posted this question in the silverlight website, and they refer me here

Original question

i have two questions:

1)how can i turn aclass which was auto generated by the linq to sql into a DataContract?

and

2) why if i return a list of items from my wcf, i get an ObservableCollection instead on the client?

thanks in advance

jony

Answer 1

Hi,

>1)how can i turn aclass which was auto generated by the linq to sql into a DataContract?

As far as I know, there is no way to do it.

You should do it via yourself because linq to sql is not designed for wcf .

>2) why if i return a list of items from my wcf, i get an ObservableCollection instead on the client?

For ObservableCollection , please refer to the images below:

Hope helpful.

Answer 2

More images.

My interface is :List<Company> GetAppointmentJson(int companyId, int appointmentDate);

The client side is :

Hope helpful.

Answer 3

 i did found an anwer to the first question here is the way to do it:

Response to the original question that started this thread:

 

You can specify that you want DataContract/DataMember attributes in designer or SqlMetal.

In designer, just right click on the design surface and specify "Unidirectional" in property grid for "Serialization Mode".

For SqlMetal, the /serialization:Unidirectional does the same trick.

 

Unidirectional indicates that id/idrefs are _not_ used. Currently we do not support bidirectional setting which would require id/idrefs to handle cycles.

 

Thanks,

Dinesh

http://blogs.msdn.com/Dinesh.Kulkarni/