C# 如何根据级别的不同设置TreeView项目的样式

我有一个

TreeView

，这将是我已经为其创建样式的三个层次。当我将这三个级别与我的自定义样式硬编码在一起时，它会按预期工作。当我尝试绑定到TreeView时，级别没有正确呈现

硬编码树视图

<TreeView>
    <TreeViewItem Header="First Level" Style="{StaticResource TreeViewItemGroup}">
        <TreeViewItem Header="Second Level (a)" Style="{StaticResource TreeViewItemSubGroup}">
            <TreeViewItem Style="{StaticResource TreeViewItemItem}" />
            <TreeViewItem Style="{StaticResource TreeViewItemItem}" />
            <TreeViewItem Style="{StaticResource TreeViewItemItem}" />
        </TreeViewItem>
        <TreeViewItem Header="Second Level (b)" Style="{StaticResource TreeViewItemSubGroup}">
        </TreeViewItem>
    </TreeViewItem>
</TreeView>

带绑定的TreeView

<DataTemplate x:Key="MenuItemTemplate">
    <TreeViewItem Style="{StaticResource TreeViewItemItem}" />
</DataTemplate>

<HierarchicalDataTemplate x:Key="MenuSubGroupTemplate"
                          ItemsSource="{Binding MenuItems}"
                          ItemTemplate="{StaticResource MenuItemTemplate}">
    <TreeViewItem Header="{Binding Header}" Style="{StaticResource TreeViewItemSubGroup}" />
</HierarchicalDataTemplate>

<HierarchicalDataTemplate x:Key="MenuGroupTemplate"
                          ItemsSource="{Binding MenuSubGroups}"
                          ItemTemplate="{StaticResource MenuSubGroupTemplate}">
    <TreeViewItem Header="{Binding Header}" Style="{StaticResource TreeViewItemGroup}" />
</HierarchicalDataTemplate>

<TreeView Grid.Row="1" ItemsSource="{Binding MenuGroups}" ItemTemplate="{StaticResource MenuGroupTemplate}"/>

---

我必须将每个样式放入

HierarchycalDataTemplate

的

ItemContainerStyle

和

TreeView

<DataTemplate x:Key="MenuItemTemplate">
    <TreeViewItem Style="{StaticResource TreeViewItemItem}" />
</DataTemplate>

<HierarchicalDataTemplate x:Key="MenuSubGroupTemplate"
                          ItemsSource="{Binding MenuItems}"
                          ItemTemplate="{StaticResource MenuItemTemplate}">
    <TextBlock Text={Binding Header} />
    <HierarchicalDataTemplate.ItemContainerStyle>
        <Style><!-- 3rd STYLE HERE --></Style>
    </HierarchicalDataTemplate.ItemContainerStyle>
</HierarchicalDataTemplate>

<HierarchicalDataTemplate x:Key="MenuGroupTemplate"
                          ItemsSource="{Binding MenuSubGroups}"
                          ItemTemplate="{StaticResource MenuSubGroupTemplate}">
    <TextBlock Text={Binding Header} />
    <HierarchicalDataTemplate.ItemContainerStyle>
        <Style><!-- 2nd STYLE HERE --></Style>
    </HierarchicalDataTemplate.ItemContainerStyle>
</HierarchicalDataTemplate>

<TreeView ItemsSource="{Binding MenuGroups}" ItemTemplate="{StaticResource MenuGroupTemplate}">
    <TreeView.ItemContainerStyle>
        <Style><!-- 1st Level Style --></Style>
    </TreeView.ItemContainerStyle>
</TreeView>

---

是的，这是最好的方法。

<DataTemplate x:Key="MenuItemTemplate">
    <TreeViewItem Style="{StaticResource TreeViewItemItem}" />
</DataTemplate>

<HierarchicalDataTemplate x:Key="MenuSubGroupTemplate"
                          ItemsSource="{Binding MenuItems}"
                          ItemTemplate="{StaticResource MenuItemTemplate}">
    <TextBlock Text={Binding Header} />
    <HierarchicalDataTemplate.ItemContainerStyle>
        <Style><!-- 3rd STYLE HERE --></Style>
    </HierarchicalDataTemplate.ItemContainerStyle>
</HierarchicalDataTemplate>

<HierarchicalDataTemplate x:Key="MenuGroupTemplate"
                          ItemsSource="{Binding MenuSubGroups}"
                          ItemTemplate="{StaticResource MenuSubGroupTemplate}">
    <TextBlock Text={Binding Header} />
    <HierarchicalDataTemplate.ItemContainerStyle>
        <Style><!-- 2nd STYLE HERE --></Style>
    </HierarchicalDataTemplate.ItemContainerStyle>
</HierarchicalDataTemplate>

<TreeView ItemsSource="{Binding MenuGroups}" ItemTemplate="{StaticResource MenuGroupTemplate}">
    <TreeView.ItemContainerStyle>
        <Style><!-- 1st Level Style --></Style>
    </TreeView.ItemContainerStyle>
</TreeView>