Bind To Web Service Tutorial

Hans — Fri, 18 May 2012 05:46:58 GMT

Hello,

We’re really sorry for the inconvenience.
We’ve made a working sample that you could try.
We will try to check and repair our tutorial, so this case does not happen again.

Please open “ReadMe.txt”, before you run the sample.

Thank you for understanding.
Regards,
Hans.

Bind To Web Service Tutorial

qafrank1 — Wed, 16 May 2012 10:58:03 GMT

I am working the tutorial located here.

When I run the project, I receive the error "Instances of abstract classes cannot be created" at the return context.Customers.ToList(); line when I browse the webservice and when I run the project.

    [WebMethod]
    public List<Customer> GetCustomers()
    {
        northwindDataContext context = new northwindDataContext();
        context.DeferredLoadingEnabled = false;
        context.ObjectTrackingEnabled = false;
        return context.Customers.ToList();
    }

Also, in step 8, the directions state to "and set SerializationMode into Unidirectional." Where do I set this value?

The complete error message is:

System.InvalidOperationException: Instances of abstract classes cannot be created.
   at System.Runtime.CompilerServices.RuntimeHelpers._CompileMethod(IRuntimeMethodInfo method)
   at System.Reflection.Emit.DynamicMethod.CreateDelegate(Type delegateType)
   at System.Data.Linq.SqlClient.ObjectReaderCompiler.Compile(SqlExpression expression, Type elementType)
   at System.Data.Linq.SqlClient.SqlProvider.GetReaderFactory(SqlNode node, Type elemType)
   at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)
   at System.Data.Linq.Table`1.GetEnumerator()
   at System.Data.Linq.Table`1.System.Collections.Generic.IEnumerable<TEntity>.GetEnumerator()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at GridClientBinding.GetCustomers() in c:\Venture21\MyServiceExample\App_Code\GridClientBinding.cs:line 37

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Bind To Web Service Tutorial

Bind To Web Service Tutorial