WCF Data Services: MaxProtocolVersion set at v2 despite Service set at v3. Ends up Throwing error on OfType()

Question

I'm having a problem that when I attempt to do a linq query against my odata service with the OfType() method, I get an error saying that the request isn't valid for a Version 2 service. I have created the WCF Data Service and have set the MaxProtocolVersion to v3.

public class TestDirectorySearch : DataService<TestDirectoryEntities>
{
    public static void InitializeService(DataServiceConfiguration config)
    {
        config.SetEntitySetAccessRule("*", EntitySetRights.AllRead);
        config.SetEntitySetPageSize("*", 50);

        config.UseVerboseErrors = true;
        config.DataServiceBehavior.MaxProtocolVersion = System.Data.Services.Common.DataServiceProtocolVersion.V3;
    }
}

My edmx has the following line:

<edmx:DataServices m:DataServiceVersion="1.0" 
    m:MaxDataServiceVersion="3.0" 
    xmlns:m="http://schemas.microsoft.com/ado/2007/08/dataservices/metadata">

When I attempt to do the following query I get an error saying that the "The method 'OfType' is not supported when MaxProtocolVersion is less than '3.0'."

from test in context.Tests.OfType<OrderableTest>()
    where test.TestRevisionId.Equals(mmt.RevisionId)
    select new
    {
            Reflex = test.ReflexTest
            , ShipTemp = (test.SpecimenTemperature == null) ? null : test.SpecimenTemperature.DisplayDescription
    }).FirstOrDefault();

If I check the MaxProtocolVersion of my context, it is set at v2. At what point is this failing? What can I do to set this correctly?

Exact error:

{"The method 'OfType' is not supported when MaxProtocolVersion is less than '3.0'."}

Requested stack trace:

at System.Data.Services.Client.ResourceBinder.AnalyzeOfType(MethodCallExpression mce, DataServiceProtocolVersion maxProtocolVersion)
at System.Data.Services.Client.ResourceBinder.VisitMethodCall(MethodCallExpression mce)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitMethodCall(MethodCallExpression m)
at System.Data.Services.Client.ResourceBinder.VisitMethodCall(MethodCallExpression mce)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ResourceBinder.AnalyzeProjection(MethodCallExpression mce, SequenceMethod sequenceMethod, Expression& e)
at System.Data.Services.Client.ResourceBinder.VisitMethodCall(MethodCallExpression mce)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitExpressionList(ReadOnlyCollection`1 original)
at System.Data.Services.Client.ALinqExpressionVisitor.VisitMethodCall(MethodCallExpression m)
at System.Data.Services.Client.ResourceBinder.VisitMethodCall(MethodCallExpression mce)
at System.Data.Services.Client.ALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.DataServiceALinqExpressionVisitor.Visit(Expression exp)
at System.Data.Services.Client.ResourceBinder.Bind(Expression e, DataServiceContext context)
at System.Data.Services.Client.DataServiceQueryProvider.Translate(Expression e)
at System.Data.Services.Client.DataServiceQuery`1.Translate()
at System.Data.Services.Client.DataServiceQuery`1.Execute()
at System.Data.Services.Client.DataServiceQuery`1.GetEnumerator()
at System.Linq.Enumerable.FirstOrDefault[TSource](IEnumerable`1 source)
at System.Data.Services.Client.DataServiceQueryProvider.ReturnSingleton[TElement](Expression expression)
at System.Data.Services.Client.DataServiceQueryProvider.Execute[TResult](Expression expression)
at System.Linq.Queryable.FirstOrDefault[TSource](IQueryable`1 source)
at TDMixBLL.TestDirectoryServiceHandler.PopulateOrderableTestInfo(MonitoredMixTest mmt) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 161
at TDMixBLL.TestDirectoryServiceHandler.PopulateTestInfo(MonitoredMixTest test) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 124
at TDMixBLL.TestDirectoryServiceHandler.GetTest(Int64 testRevisionId) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 112
at TDMixBLL.TestDirectoryServiceHandler.PopulateTests(List`1 testsToPopulate) in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMixBLL\TDMixBLL\TestDirectoryServiceHandler.cs:line 66
at TDMix2.Tests.TestRetrievalTests.TestPopulate() in C:\Dev\TDMix\ANSR - TDMix\TDMix2\TDMix2.Tests\TestRetrievalTests.cs:line 38

Answer 1

This is an error on the client. The DataServiceContext has to be constructed with V3 in order to support V3 features (like OfType). DataServiceContext has a new constructor overload which takes the MaxProtocolVersion parameter. Make sure that you use it and pass in V3.

Answer 2

In addition to installing the MSI as above, you can find your way into the Nuget constructur you're looking for by extending the partial class

namespace Project.ServiceReference
{
    public partial class MyEntities : global::System.Data.Services.Client.DataServiceContext
    {
        public TestDirectoryEntities(string uri)
            : base(new Uri(uri), DataServiceProtocolVersion.V3)
        {
            this.ResolveName = new global::System.Func<global::System.Type, string>(this.ResolveNameFromType);
            this.ResolveType = new global::System.Func<string, global::System.Type>(this.ResolveTypeFromName);
            this.OnContextCreated();
        }
    }
}

The 3 lines are copied directly from the Reference.cs.