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Silverlight odata question

Posted on 2010-11-30
2
914 Views
Last Modified: 2012-05-10
Hello,
I am learing about odata and Silverlight.  I have a service reference to the Northwind odata and a DataServiceCollection.  When I try to do LoadAsync it fails with an error:
System.InvalidOperationException: This operation is only supported on collections that are being tracked.

Here is my code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightTestOdata
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
        }


        private ServiceReference1.NorthwindEntities svc;

        private System.Data.Services.Client.DataServiceCollection<ServiceReference1.Product> productBindingCollection;

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            svc = new ServiceReference1.NorthwindEntities(new Uri(@"http://services.odata.org/Northwind/Northwind.svc"));
            
            productBindingCollection = new System.Data.Services.Client.DataServiceCollection<ServiceReference1.Product>();

            productBindingCollection.LoadCompleted += new EventHandler<System.Data.Services.Client.LoadCompletedEventArgs>(productBindingCollection_LoadCompleted);

            productBindingCollection.LoadAsync();
            
        }

        void productBindingCollection_LoadCompleted(object sender, System.Data.Services.Client.LoadCompletedEventArgs e)
        {
           if (e.Error == null)
           {
              dataGrid1.DataContext = productBindingCollection;
           }
           else
           {
              MessageBox.Show(e.Error.Message);
           }
        }
    }
}

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Question by:Qu311
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2 Comments
 

Author Comment

by:Qu311
ID: 34251070
I added a DataServiceQuery which got rid of the error but I don't see any data displayed in my Datagrid.
private void button1_Click(object sender, RoutedEventArgs e)
        {
            svc = new ServiceReference1.NorthwindEntities(new Uri(@"http://services.odata.org/Northwind/Northwind.svc"));
            
            productBindingCollection = new System.Data.Services.Client.DataServiceCollection<ServiceReference1.Product>();

            productBindingCollection.LoadCompleted += new EventHandler<System.Data.Services.Client.LoadCompletedEventArgs>(productBindingCollection_LoadCompleted);

            DataServiceQuery<ServiceReference1.Product> query = svc.Products;

            productBindingCollection.LoadAsync(query);
            
        }

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Accepted Solution

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Qu311 earned 0 total points
ID: 34251490
I changed DataContext to ItemsSource and it worked.
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