WPF 动态更换模板详解编程语言

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; 
        } 
    } 
}