SL: Why my DomainService returns my result queries as null?

SL: Why my DomainService returns my result queries as null?

I'm working right now with Silverlight and RIA Services.

In my project I have a DomainService and a AuthenticationService.

When I authenticate, I realized that if I debug my ObjectContext I can see all the records from my database.

But when I use my DomainService, I'm trying to get the objects from the default queries, for I.E. GetStudents but always the queries returns 0 elements.

But from it, I want to do a Insert, it works

            // Has finished             var jsonObjects = JsonConvert.SerializeObject(Test, Formatting.Indented);              var context = new DatabaseDomainContext();             // it works!! add the object             //Student newStudent = new Student();             //newStudent.Id = "OPA-3DKCL2";             //newStudent.FirstName = "Oscar";             //newStudent.LastName = "Fimbres";              //context.Students.Add(newStudent);             //context.SubmitChanges();              // all the time returns 0 elements             var students2 = context.Load(context.GetStudentsQuery()).Entities;              // the same             var students = context.GetStudentsQuery();             AnsweredTest answerTest = new AnsweredTest();             answerTest.JsonTest = jsonObjects;             answerTest.Date = DateTime.Now;             //answerTest.Student = context.Students.SingleOrDefault(x => x.Id == "OPA-3DKCLS"); 

If I'm missing an important data, please let me know.

Answers & Comments...

Answer: 1

Load operation is asyncronious, you need to subscribe to Completed event and get result there:

var loadOperation = context.Load(context.GetStudentsQuery()); operation.Completed += OnStudentsLoaded;  private void OnStudentsLoaded(object sender, EventArgs e) {     var operation = sender as LoadOperation<Student>;     if (operation == null)     {         throw new ArgumentException("sender is not LoadOpearation<Student>");     }     IEnumerable<Student> students = operation.Entities;      //..... } 

Answer by dvvrd for SL: Why my DomainService returns my result queries as null?

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