【WPF】数据模板选择器DataTemplateSelector

作用：为数据模型内不同的属性值应用不同的数据模板，多用于容器

以listbox为例：

<ListBox x:Name="_list" ItemsSource="{Binding Model}"/>

    public partial class MainWindow : Window
    {
        public List<Student> StuList { get; set; } = new List<Student>();
        public MainWindow()
        {
            InitializeComponent();
            _list.DataContext = new { Model= StuList };
            StuList.Add(new Student("张三", 60));
            StuList.Add(new Student("张四", 70));
            StuList.Add(new Student("张五", 80));
            StuList.Add(new Student("张六", 90));
            StuList.Add(new Student("张一", 40));
            StuList.Add(new Student("张二", 100));
        }
        
    }
    public class Student
    {
        public Student(string name,int score)
        {
            Name = name;
            Score = score;
        }
        public string Name { get; set; }
        public int Score { get; set; }
    }

创建 TemplateSelector 类继承自 DataTemplateSelector：

    public class TemplateSelector:DataTemplateSelector
    {
        public DataTemplate HighTemplate { get; set; }
        public DataTemplate LowTemplate { get; set; }
        public override DataTemplate SelectTemplate(object item, DependencyObject container)
        {
            if (item == null) return null;
            var stu =item as Student;
            if (stu.Score > 60) return HighTemplate;
            return LowTemplate;
        }
    }

定义模板样式：

    <Window.Resources>
        <DataTemplate x:Key="highTemplate">
            <StackPanel Background="Green" Orientation="Horizontal" Margin="10">
                <TextBlock Text="{Binding Name}" FontSize="30"/>
                <TextBlock Text="通过啦！！" FontSize="30"/>
            </StackPanel>
        </DataTemplate>
        <DataTemplate x:Key="lowTemplate">
            <StackPanel Background="Red" Orientation="Horizontal" Margin="10">
                <TextBlock Text="{Binding Name}" FontSize="30"/>
                <TextBlock Text="不及格！！" FontSize="30"/>
            </StackPanel>
        </DataTemplate>
    </Window.Resources>

应用：

    <ListBox x:Name="_list" ItemsSource="{Binding Model}">
        <ListBox.ItemTemplateSelector>
            <local:TemplateSelector HighTemplate="{StaticResource highTemplate}" LowTemplate="{StaticResource lowTemplate}"/>
        </ListBox.ItemTemplateSelector>
    </ListBox>

[附](漂亮的范例)：WPF中DataTemplateSelector的简单应用 - aaayi - 博客园