Silverlight linq-to-entities匿名类型问题

Question

I am trying to work with silverlight, wcf data services ( on the website code) and Linq-to-Entities. I know that anonymous types don't work on silverlight then I created a known class in order to retrieve some information. (I know the query it is not exactly intelligent, but It is only an example) but It is not working. can somebody help me???

this is the code.

public class DataSummary
{
    public DataSummary() { }

    public int AccountID { get; set; }

    public string Account { get; set; }

    int accountID;
    string account;
}

  var p = (from q in svc.Accounts
                 select new DataSummary()
                 { AccountID = (int) q.AccountID,
                   Account = q.Account1
                 }) as DataServiceQuery<DataSummary>;

        p.BeginExecute(new AsyncCallback(r =>
        {
            try
            {
                this.grid.ItemsSource = p.EndExecute(r).ToList();
            }
            catch (Exception ex)
            {
                string message = ex.Message;
            }
        }), null);

when I run the example, the error message is

    ex.Message  "An error occurred while processing this request."  string

it is so funny, because it is not explaining the problem.

Also in this question

Silverlight 4 Data Binding with anonymous types

they said that we can used anonymous types, but then how can I put the "as DataServiceQuery.......... ??

Answer 1

When Anthony told me about the inner exception. I discovered the error on the ProtocolVersion.

public static void InitializeService(DataServiceConfiguration config)
{
    config.SetEntitySetAccessRule("*", EntitySetRights.All);

    //On the service. You have to add this line
    config.DataServiceBehavior.MaxProtocolVersion = DataServiceProtocolVersion.V2;
}

Thanks Anthony. I didn't know that the inner exception existed.