WPF 中关于 DataTemplateSelector 类的应用

MSDN的解释：

提供一种根据数据对象和与该数据绑定的元素来选择数据模板 DataTemplate 的方法。

示例代码：

<Window x:Class="WpfApplication1.Window2"

        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

        xmlns:local="clr-namespace:WpfApplication1"

        Title="Window2" Height="300" Width="300" Loaded="Window2_OnLoaded">

    <Window.Resources>

        <DataTemplate x:Key="T1">

            <TextBlock Text="{Binding}" Background="DarkBlue" Foreground="White" Padding="10,0"></TextBlock>

        </DataTemplate>

        

        <DataTemplate x:Key="T2">

            <TextBlock Text="{Binding}" Background="DarkCyan" Foreground="White" Padding="10,0"></TextBlock>

        </DataTemplate>



        <local:CTemplateSelector x:Key="TS"></local:CTemplateSelector>

    </Window.Resources>

    <Grid>

        <ListBox x:Name="Lbox" ItemTemplateSelector="{StaticResource TS}"></ListBox>

    </Grid>

</Window>

public partial class Window2 : Window

{

    public Window2()

    {

        InitializeComponent();

    }



    private void Window2_OnLoaded(object sender, RoutedEventArgs e)

    {

        var source = new List<string>

        {

            "1","2","3","4"

        };



        this.Lbox.ItemsSource = source;

    }

}

public class CTemplateSelector:DataTemplateSelector

{

    public override DataTemplate SelectTemplate( object item, DependencyObject container )

    {

        if (item == null) throw new ArgumentNullException("item");



        var element = container as FrameworkElement;



        if ( element != null )

        {

            var str = item.ToString();

            int val;



            if (int.TryParse(str, out val))

            {

                if (val%2 == 0)

                {

                    return element.FindResource("T1") as DataTemplate;

                }

                else

                {

                    return element.FindResource( "T2" ) as DataTemplate;

                }

            }

        }



        return base.SelectTemplate(item, container);

    }

}

这个示例就是在一个 ListBox 控件中实现隔行换色的功能，当然也可以通过其他方法实现。

运行结果：

参考：

http://msdn.microsoft.com/zh-cn/library/system.windows.controls.datatemplateselector%28v=vs.110%29.aspx