wpf - DataTemplateSelector 不会被使用

Question

为了根据当前的 Item 类型在 ListView 中的两个 ItemTemplates 之间切换，我实现了一个 DataTemplateSelector。我通过 Binding 将其添加到 ListView 中。但如果我设置了一个断点，它就永远不会被调用。我尝试了一切，但没有任何效果。

public class ListViewTemplateSelector : DataTemplateSelector
{
    public DataTemplate SectionTemplate { get; set; }
    public DataTemplate EntryTemplate { get; set; }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        if (item is Section)
        {
            return SectionTemplate;
        }

        if (item is Entry)
        {
            return EntryTemplate;
        }

        return base.SelectTemplate(item, container);
    }
}

XAML:

<ListView DataContext="{Binding ElementName=This}" x:Name="list" Margin="200,25,0,0" ItemsSource="{Binding CurrentSelection}" ItemTemplateSelector="{StaticResource TemplateSelector}">
    <ListView.View>
        <GridView>
            <GridViewColumn Header="ID" DisplayMemberBinding="{Binding ID}" Width="100" />
            <GridViewColumn Header="Value" DisplayMemberBinding="{Binding Value}" Width="300" />
        </GridView>
    </ListView.View>
</ListView>

<DataTemplate x:Key="sectionTemplate">
    <StackPanel Orientation="Horizontal">
        <Image Width="16" Height="16" Source="\Icons\blue-folder.png" />
        <TextBlock Text="{Binding ID}" Margin="5,0,0,0" />
    </StackPanel>
</DataTemplate>

<DataTemplate x:Key="entryTemplate">
    <StackPanel Orientation="Horizontal">
        <Image Width="16" Height="16" Source="\Icons\ui-text-field-medium.png" />
        <TextBlock Text="{Binding ID}" Margin="5,0,0,0" />
    </StackPanel>
</DataTemplate>

<sdk:ListViewTemplateSelector x:Key="TemplateSelector" SectionTemplate="{StaticResource sectionTemplate}" EntryTemplate="{StaticResource entryTemplate}" />

有人知道如何解决这个问题吗？

谢谢R

Answer 1

来自GridView Overview > GridView Layout and Style > 在 GridView 中定义列并设置其样式:

When defining the data field to display in a GridViewColumn, use the DisplayMemberBinding, CellTemplate, or CellTemplateSelector properties. The DisplayMemberBinding property takes precedence over either of the template properties.

因此，您必须从 GridViewColumns 中删除 DisplayMemberBinding 并设置 CellTemplateSelector而不是 ListView 的 ItemTemplateSelector:

<GridView>
    <GridViewColumn Header="ID" Width="100"
                    CellTemplateSelector="{StaticResource TemplateSelector}"/>
    <GridViewColumn Header="Value" Width="300"
                    DisplayMemberBinding="{Binding Value}"/>
</GridView>