DomainContext Class

For each domain service in the server project, WCF RIA Services generates a class that derives from DomainContext. You use the generated DomainContext class to interact with the domain service. You retrieve data by calling the Load method and passing one of the generated query methods as a parameter. You save changes in the data by calling the SubmitChanges method. You cancel all pending data changes and revert the data to its previous state by calling the RejectChanges method. The generated class contains query methods that correspond to query methods in the domain service. By default, RIA Services uses a naming convention for the generated domain context and its methods. For example, a domain service in the server project named CustomerDomainService will have a domain context class in the client project named CustomerDomainContext. A query method named GetCustomers has a corresponding method in the client project named GetCustomersQuery. For more information, see Client Code Generation.

To find the generated domain context class, select Show All Files in the Silverlight project and open the Generated_Code folder.

When you execute a domain operation, the operation is processed asynchronously. To take an action after the operation has completed, you must provide a callback method. An example of providing a callback method is shown below.

The following example shows how to create an instance of a generated DomainContext class and load data from a query.

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;
using RIAServicesExample.Web;
using System.Windows.Ria;

namespace RIAServicesExample
{
    public partial class MainPage : UserControl
    {
        private CustomerDomainContext _customerContext = new CustomerDomainContext();

        public MainPage()
        {
            InitializeComponent();

            LoadOperation<Customer> loadOp = this._customerContext.Load(this._customerContext.GetCustomersQuery());
            CustomerGrid.ItemsSource = loadOp.Entities;
        }
    }
}

Reference