D21_01_View对象

<Window x:Class="demo.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"        
        Title="NavigateCollection" Height="367" Width="422" 
        xmlns:db="clr-namespace:StoreDatabase;assembly=StoreDatabase"
        xmlns:local="clr-namespace:demo"
    >
    <Grid Margin="10">
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"></RowDefinition>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>
        <!--IsSynchronizedWithCurrentItem同步view显示内容-->
        <ComboBox Name="lstProduts" DisplayMemberPath="ModelName" Text="{Binding Path=ModelName}"
                  IsSynchronizedWithCurrentItem="True" SelectionChanged="lstProducts_SelectionChanged"></ComboBox>
        
        <Border Grid.Row="1" Padding="5" Margin="0,5,0,5" Background="LightSteelBlue">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="Auto"></ColumnDefinition>
                    <ColumnDefinition></ColumnDefinition>
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition Height="Auto"></RowDefinition>
                    <RowDefinition Height="Auto"></RowDefinition>
                    <RowDefinition Height="Auto"></RowDefinition>
                    <RowDefinition Height="Auto"></RowDefinition>
                    <RowDefinition Height="*"></RowDefinition>
                </Grid.RowDefinitions>
                
                <TextBlock Margin="7">Model Number:</TextBlock>
                <TextBox Margin="5" Grid.Column="1" Text="{Binding Path=ModelNumber}"></TextBox>
                <TextBlock Margin="7" Grid.Row="1">Model name:</TextBlock>
                <TextBox Margin="5" Grid.Row="1" Grid.Column="1" Text="{Binding Path=ModelName}"></TextBox>
                <TextBlock Margin="7" Grid.Row="2">Unit Cost:</TextBlock>
                <TextBox Margin="5" Grid.Row="2" Grid.Column="1" Text="{Binding Path=UnitCost,StringFormat={}{0:C}}"></TextBox>
                <TextBlock Margin="7,7,7,0" Grid.Row="3">Description:</TextBlock>
                <TextBox Margin="7" Grid.Row="4" Grid.Column="0" Grid.ColumnSpan="2"
                         TextWrapping="Wrap" VerticalScrollBarVisibility="Visible" Text="{Binding Path=Description}"></TextBox>
            </Grid>
        </Border>
        
        <Grid Grid.Row="2">
            <StackPanel Orientation="Horizontal">
                <Button Name="cmdPrev" Click="cmdPrev_Click">&lt;</Button>
                <TextBlock Margin="5,0,5,0" Name="lblPostion" VerticalAlignment="Center"></TextBlock>
                <Button Name="cmdNext" Click="cmdNext_Click">&gt;</Button>
            </StackPanel>
        </Grid>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using StoreDatabase;

namespace demo
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        private ICollection<Product> products;
        private ListCollectionView view;

        public MainWindow()
        {
            InitializeComponent();
            //this.lstProducts.ItemsSource = App.StoreDb.GetProducts();
            products = App.StoreDb.GetProducts();

            this.DataContext = products;
            view = (ListCollectionView)CollectionViewSource.GetDefaultView(this.DataContext);
            view.CurrentChanged += new EventHandler(view_CurrentChanged);

            this.lstProduts.ItemsSource = products;
        }

        private void cmdPrev_Click(object sender, RoutedEventArgs e)
        {
            view.MoveCurrentToPrevious();
            
            
        }

        private void cmdNext_Click(object sender, RoutedEventArgs e)
        {
            view.MoveCurrentToNext();
        }

        private void view_CurrentChanged(object sender, EventArgs e)
        {
            this.lblPostion.Text = "Record " + (view.CurrentPosition + 1).ToString() + " of " + view.Count.ToString();
            cmdPrev.IsEnabled = view.CurrentPosition > 0;
            cmdNext.IsEnabled = view.CurrentPosition < view.Count - 1;
        }

        //private void lstProducts_SelectionChanged(object sender, RoutedEventArgs e)
        //{
        //    view.MoveCurrentTo(lstProduts.SelectedItem);
        //}

        private void lstProducts_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            view.MoveCurrentTo(lstProduts.SelectedItem);
        }
    }
}