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Query Interceptors problem in ADO.NET Data Service

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Henk asked on 23 Feb 2010, 04:38 PM

I have a problem using Query interceptors in a ADO.NET Data Service.
For the test I used the Silverlight integration sample application using the NorthWindOA database.
This is the code in the Silverlight application of the query of Orders and OrderDetails using Expand:
            // Create the Service class specifying the location of the ADO.NET Data Services   
            this.context = new OADataContext(new Uri("OADataService.svc", UriKind.Relative));  
            var Orders =  
                (from o  
                 in this.context.Orders.Expand("OrderDetails")  
                 select o  
                 ) as DataServiceQuery<Order>;  
            //use code block to perform the binding at the end of the async call  
            //casting the Customers to a LIST  
                (ar) => this.RadGridView1.ItemsSource = Orders.EndExecute(ar).ToList(), null); 
In the Data Service I implemented two Query interceptors for Orders and OrderDetails.
    public Expression<Func<Model.Order, bool>> OnQueryOrders()  
        return i => i.OrderID < 10255;  
    public Expression<Func<Model.OrderDetail, bool>> OnQueryOrderDetails()  
        return i => i.OrderID < 10255;  
If I only implement the Query interceptor for Orders everything works ok.
If I add the Query interceptor for OrderDetails I get an Error:
System.Data.Services.Client.DataServiceQueryException was unhandled by user code  
  Message="An error occurred while processing this request." 
       at System.Data.Services.Client.QueryAsyncResult.EndExecute[TElement](Object source, IAsyncResult asyncResult)  
       at System.Data.Services.Client.DataServiceQuery`1.EndExecute(IAsyncResult asyncResult)  
       at OASilverlightTestApp.Page.<>c__DisplayClass1.<.ctor>b__0(IAsyncResult ar)  
       at System.Data.Services.Client.BaseAsyncResult.HandleCompleted()  
       at System.Data.Services.Client.QueryAsyncResult.AsyncEndRead(IAsyncResult asyncResult)  
       at System.IO.Stream.BeginRead(Byte[] buffer, Int32 offset, Int32 count, AsyncCallback callback, Object state)  
       at System.Data.Services.Client.QueryAsyncResult.AsyncEndGetResponse(IAsyncResult asyncResult)  
  InnerException: System.InvalidOperationException  
       Message="An error occurred while saving changes. See the inner exception for details." 
            at System.Data.Services.Client.BaseAsyncResult.EndExecute[T](Object source, String method, IAsyncResult asyncResult)  
            at System.Data.Services.Client.QueryAsyncResult.EndExecute[TElement](Object source, IAsyncResult asyncResult)  
       InnerException: System.Data.Services.Client.DataServiceClientException  
            Message="<?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"yes\"?>\r\n<error xmlns=\"\">\r\n  <code></code>\r\n  <message xml:lang=\"nl-NL\">Not Implemented</message>\r\n</error>"  
Is this error related to OA or ADO.NET Data Services?

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Telerik team
answered on 01 Mar 2010, 12:51 PM
Hello Henk,

We tested the behavior you described using our latest code base and everything worked fine. Since we are targeting great improvements in our LINQ implementation I believe that with the Q1 release you will not be seeing this problem. The Q1 release is scheduled for the next week.

Best wishes,
the Telerik team

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