WPF 动态更换模板

Window x:Class="模板选择器.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:模板选择器"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <local:MyDataTemplateSelector  x:Key="tmpdog"></local:MyDataTemplateSelector>
        <DataTemplate x:Key="dta">
            <Border BorderThickness="2" BorderBrush="red" Background="GreenYellow">
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Name}"  Margin="10"></TextBlock>
                    <TextBlock Text="{Binding ID}" Margin="10"></TextBlock>
                </StackPanel>
            </Border>
        </DataTemplate>
        <DataTemplate x:Key="dtb" DataType="ListBox">
            <Border BorderThickness="1" BorderBrush="Blue" Background="LightBlue" Padding="5" >
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding Name}"  Margin="10"></TextBlock>
                    <TextBlock Text="{Binding ID}" Margin="10"></TextBlock>
                </StackPanel>
            </Border>
        </DataTemplate>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*"></RowDefinition>
            <RowDefinition Height="Auto"></RowDefinition>
        </Grid.RowDefinitions>
        <ListBox  Name="listbox" ItemTemplateSelector="{StaticResource tmpdog}">
        </ListBox>
        <Button  Grid.Row="1" Width="75" Height="23" Click="Button_Click">确定</Button>
    </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;

namespace 模板选择器
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            InitData();
            listbox.ItemsSource = list;            

        }
        public List<Student> list { get; set; }
        public void InitData()
        {
            Random r = new Random();
            list = new List<Student>();
            for (int i = 0; i < 15; i++)
            {
                list.Add(new Student
                {
                    Name = "dog" + i,
                    ID = r.Next(100)
                });
            }
        }

        int i = 0;
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            if (i%2==0)
            {
                listbox.SetResourceReference(ListBox.ItemTemplateProperty, "dta");
            }
            else
            {
                listbox.SetResourceReference(ListBox.ItemTemplateProperty, "dtb");
            }
            i++;
        }
    }
    public class Student
    {
        public int ID
        {
            set;
            get;
        }

        public string Name
        {
            set;
            get;
        }
    }

    public class MyDataTemplateSelector : DataTemplateSelector
    {
        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            var fe = container as FrameworkElement;
            var obj = item as Student;
            DataTemplate dt = null;
            if (obj != null && fe != null)
            {
                if (obj.ID > 30)
                {
                    dt = fe.FindResource("dta") as DataTemplate;
                }
                else
                {
                    dt = fe.FindResource("dtb") as DataTemplate;
                }
            }
            return dt;
        }
    }
}