using System;
using System.Windows;
using System.Threading;
using System.Collections.ObjectModel;
using SimpleMvvmToolkit;
using Crowsol.QB.UI.Services;
using Crowsol.QB.UI.Models;
using SimpleMvvmToolkit.ModelExtensions;

namespace Crowsol.QB.UI
{
    /// <summary>
    /// This class contains properties that a View can data bind to.
    /// <para>
    /// Use the <strong>mvvmprop</strong> snippet to add bindable properties to this ViewModel.
    /// </para>
    /// </summary>
    public class ProductsListViewModel : ViewModelBase<ProductsListViewModel>
    {
        #region Initialization and Cleanup

        // TODO: Add a member for IXxxServiceAgent
        private IProductServiceAgent serviceAgent;

        // Default ctor
        public ProductsListViewModel() { }

        // TODO: ctor that accepts IXxxServiceAgent
        public ProductsListViewModel(IProductServiceAgent serviceAgent)
        {
            this.serviceAgent = serviceAgent;
        }

        #endregion

        #region Notifications

        // TODO: Add events to notify the view or obtain data from the view
        public event EventHandler<NotificationEventArgs<Exception>> ErrorNotice;

        #endregion

        #region Properties

        private ObservableCollection<Product> _products;
        public ObservableCollection<Product> Products
        {
            get { return _products; }
            set
            {
                _products = value;
                NotifyPropertyChanged(m => m._products);
            }
        }

        #endregion

        #region Methods

        public void LoadProducts()
        {
            var products = serviceAgent.LoadProducts();
            Products = new ObservableCollection<Product>(products);
        }

        #endregion

        #region Completion Callbacks

        // TODO: Optionally add callback methods for async calls to the service agent
        
        #endregion

        #region Helpers

        // Helper method to notify View of an error
        private void NotifyError(string message, Exception error)
        {
            // Notify view of an error
            Notify(ErrorNotice, new NotificationEventArgs<Exception>(message, error));
        }

        #endregion
    }
}

<UserControl x:Class="Crowsol.QB.UI.ProductListView"
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
             xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
             mc:Ignorable="d" 
             d:DesignHeight="392" d:DesignWidth="573"
             DataContext="{Binding Source={StaticResource Locator}, Path=ProductListViewModel}"
             >
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="68*" />
            <RowDefinition Height="324*" />
        </Grid.RowDefinitions>
      <Button Content="Load Products" Height="23" HorizontalAlignment="Left" Margin="7,10,0,0" Name="LoadProductsButton" VerticalAlignment="Top" Width="101">
        <!-- Add reference to Microsoft.Expression.Interactions.dll, System.Windows.Interactivity.dll -->
        <!-- Use mvvmxmlns snippet to add i and ei namespace prefixes -->
        <i:Interaction.Triggers>
          <i:EventTrigger EventName="Click">
            <ei:CallMethodAction
                    TargetObject="{Binding}"
                    MethodName="LoadProducts"/>
          </i:EventTrigger>
        </i:Interaction.Triggers>
      </Button>
        <DataGrid AutoGenerateColumns="True"
                  Grid.Row="1"
                  Height="312"
                  Name="dataGrid1"
                  Width="573"
                  ItemsSource="{Binding Path=Products, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
                  EnableRowVirtualization="False">
          
        </DataGrid>
    </Grid>
</UserControl>

// m_products should be m.Products        
private ObservableCollection<Product> _products;
        public ObservableCollection<Product> Products
        {
            get { return _products; }
            set
            {
                _products = value;
                NotifyPropertyChanged(m => m._products);
            }
        }