Syntax for programmatically retrieving a recordset from RIAServices

         private ObservableCollection<MyEntity> _MyEntityList;  
         public ObservableCollection<MyEntity> MyEntityList  
         {  
             get{ return _MyEntityList; }  
             set  
             {  
                 _MyEntityList = value;  
                 RaisePropertyChanged("MyEntityList");  
             }  
         }  
   
     public void LoadData()   
      {   
        _Context.Load(_Context.GetMyEntityQuery(), LoadBehavior.RefreshCurrent,   
          DataLoaded, null);   
        IsBusy = false;   
      }   
     
      public void DataLoaded(LoadOperation<MyEntity> loadOperation)   
      {   
        if (loadOperation.HasError)   
        {   
          System.Windows.MessageBox.Show(loadOperation.Error.ToString(), "Load Error", System.Windows.MessageBoxButton.OK);   
          loadOperation.MarkErrorAsHandled();   
          MyEntityList = null;   
        }   
        else    
          MyEntityList = new ObservableCollection<MyEntity>(loadOperation.Entities);   
        IsBusy = false;     
      }   
    

Invoking a Method Call Over RIA Services

To invoke a method through RIA Services:

On the server side, declare the method, an decorate it with the [Invoke] annotation. Return types can be simple types or collections.  Not sure if complex types work or not.

[Invoke]

public string BuildAdjusterMetricBatch(string users)
{
    DoSomeWork()

    return batch;
}

On the client side, invoke the method, and pass it a function for the asynchronous Callback:

var context = new Web.Services.MSIClaimContext();
context.BuildAdjusterMetricBatch(txtFilter.Text,  
    BatchBuildCompleted, null);

then declare a method for the callback that matches the return type of the Method.

void BatchBuildCompleted(InvokeOperation<string>
    invokeOperation)
{
    string myValue = invokeOperation.Value;
    DoClientSideWork();

}

Load operation failed for query ‘GetUser’

Getting this error when deploying a Silverlight RIAServices application to a new server.

Fiddler helped debug this one.   Pulling up the Response header in Fiddler gave the following additional information:

IIS specified authentication schemes 'IntegratedWindowsAuthentication, Anonymous', but the binding only supports specification of exactly one authentication scheme. Valid authentication schemes are Digest, Negotiate, NTLM, Basic, or Anonymous. Change the IIS settings so that only a single authentication scheme is used

Had to reboot the server after making the change, but this resolved the problem.

Calling a RIAServices Query from Code

var context = Project.Web.Services.DomainContext();

context.Load(
    context.GetSomeItemQuery(parameters),
    LoadBehavior.RefreshCurrent, DataLoaded, null);

void DataLoaded(LoadOperation<Web.Models.Entity> loadOperation)
{
    loadOperation.Entities = …

Adding and Deleting from a RIAServices DomainDataSource

If you drag and drop a ‘Details’ form from the DataSources window onto a Silverlight form, by default you won’t have any add or save ability.  To fix this, you have to add buttons to the form to do the Insert and Delete.  The code behind for those buttons looks like this:

private void btnAdd_Click(object sender, RoutedEventArgs e)
{
    Web.Models.UserEdit newUser = new Web.Models.UserEdit();
    userEditDomainDataSource.DataView.Add(newUser);
}
private void btnDelete_Click(object sender, RoutedEventArgs e)
{
    userEditDomainDataSource.DataView.Remove(userEditDomainDataSource.DataView.CurrentItem);
}