Dynamic LINQ to Entities Queries Using WCF/WPF Demo Code

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using WpfClient.ServiceReference;


namespace WpfClient.UserControls
{
    /// <summary>
    /// Simple Orders control for a Northwind.Customers object
    /// </summary>
    public partial class CurrentCustomerOrdersControl : UserControl
    {
        #region Data
        private DataTemplate detailsTemplate = null;
        private DataTemplate listTemplate = null;
        private DataTemplate iconsTemplate = null;
        #endregion

        #region Ctor
        public CurrentCustomerOrdersControl()
        {
            InitializeComponent();
            
            this.Loaded += new RoutedEventHandler(CurrentCustomerOrdersControl_Loaded);
            this.DataContext = this;
        }
        #endregion

        #region DPs

        #region CustomerOrders DP

        /// <summary>
        /// CustomerOrders Dependency Property
        /// </summary>
        public static readonly DependencyProperty CustomerOrdersProperty =
            DependencyProperty.Register("CustomerOrders", typeof(List<Orders>), 
            typeof(CurrentCustomerOrdersControl),
                new FrameworkPropertyMetadata(null,
                    new PropertyChangedCallback(OnCustomerOrdersChanged)));

        /// <summary>
        /// Gets or sets the CustomerOrders property.  
        /// </summary>
        public List<Orders> CustomerOrders
        {
            get { return (List<Orders>)GetValue(CustomerOrdersProperty); }
            set { SetValue(CustomerOrdersProperty, value); }
        }

        /// <summary>
        /// Handles changes to the CustomerOrders property.
        /// </summary>
        private static void OnCustomerOrdersChanged(DependencyObject d,
            DependencyPropertyChangedEventArgs e)
        {
            List<Orders> orders = e.NewValue as List<Orders>;

            if (orders != null)
                ((CurrentCustomerOrdersControl)d).lstOrders.ItemsSource = orders;
        }


        #endregion

        #region BoundCustomer DP

        /// <summary>
        /// BoundCustomer Dependency Property
        /// </summary>
        public static readonly DependencyProperty BoundCustomerProperty =
            DependencyProperty.Register("BoundCustomer", typeof(Customers), 
                typeof(CurrentCustomerOrdersControl),
                new FrameworkPropertyMetadata(null,
                    new PropertyChangedCallback(OnBoundCustomerChanged)));

        /// <summary>
        /// Gets or sets the BoundCustomer property.  
        /// </summary>
        public Customers BoundCustomer
        {
            get { return (Customers)GetValue(BoundCustomerProperty); }
            set { SetValue(BoundCustomerProperty, value); }
        }

        /// <summary>
        /// Handles changes to the BoundCustomer property.
        /// </summary>
        private static void OnBoundCustomerChanged(DependencyObject d, 
            DependencyPropertyChangedEventArgs e)
        {
            Customers customer = e.NewValue as Customers;

            if (customer !=null)
                ((CurrentCustomerOrdersControl) d).CustomerOrders = customer.Orders;
        }


        #endregion

        #endregion

        #region Private Methods
        private void CurrentCustomerOrdersControl_Loaded(object sender, RoutedEventArgs e)
        {
            detailsTemplate = this.TryFindResource("detailsTemplate") as DataTemplate;
            listTemplate = this.TryFindResource("listTemplate") as DataTemplate;
            iconsTemplate = this.TryFindResource("iconsTemplate") as DataTemplate;
        }

        private void btnList_Click(object sender, RoutedEventArgs e)
        {
            lstOrders.ItemTemplate = listTemplate;
        }
     

        private void btnDetails_Click(object sender, RoutedEventArgs e)
        {
            lstOrders.ItemTemplate = detailsTemplate;
        }

        private void btnIcons_Click(object sender, RoutedEventArgs e)
        {
            lstOrders.ItemTemplate = iconsTemplate;
        }
        #endregion
    }
}