Question

在treeview xaml文件下面：

<TreeView Name="templatetree"
          SelectedItemChanged="templatetree_SelectedItemChanged"
          MaxHeight="210" Background="{StaticResource MediumGrayBrush}"
          ScrollViewer.VerticalScrollBarVisibility="Auto"
          ScrollViewer.HorizontalScrollBarVisibility="Auto">
    <TreeView.ItemContainerStyle>
        <Style TargetType="{x:Type TreeViewItem}">
            <Setter Property="IsExpanded" Value="True"/>
            <Setter Property="IsSelected" Value="False" />
        </Style>
    </TreeView.ItemContainerStyle>
    <TreeView.Resources>
        <SolidColorBrush x:Key="{x:Static SystemColors.InactiveSelectionHighlightBrushKey}"
                         Color="#FF1E90FF"/>

        <HierarchicalDataTemplate DataType="{x:Type Tree:Templates}" ItemsSource="{Binding Members}">
            <StackPanel Orientation="Horizontal">
                <Image Source="../Images/template.png"
                       Height="22" Width="22" Margin="0,0,5,0"/>
                <TextBlock Text="{Binding Name}"
                           Style="{StaticResource PopupBodyTextStyle}"
                           FontFamily="{StaticResource Symbol}" MouseLeftButtonDown="HeaderNode_MouseLeftButtonDown"/>
                <TextBlock Text=" [" Foreground="{StaticResource HighlightBrush}"/>
                <TextBlock Text="{Binding Members.Count}" Foreground="{StaticResource HighlightBrush}"/>
                <TextBlock Text="]" Foreground="{StaticResource HighlightBrush}"/>
            </StackPanel>
        </HierarchicalDataTemplate>
        <DataTemplate DataType="{x:Type Tree:TemplateTypes}">
            <StackPanel Orientation="Horizontal">
                <TextBlock Text="{Binding Name}"
                           Style="{StaticResource PopupBodyTextStyle}"
                           FontFamily="{StaticResource Symbol}"
                           MouseLeftButtonDown="MemberNode_MouseLeftButtonDown"/>
            </StackPanel>
        </DataTemplate>
    </TreeView.Resources>
</TreeView>

类文件如下：

public class Templates
{
    public string Name { get; set; } 

    public ObservableCollection<TemplateTypes> Members { get; set; } = new ObservableCollection<TemplateTypes>();
}

public class TemplateTypes
{
    public string Name { get; set; }

    public string Version { get; set; }
}

输出如：

Template1
    --Template1.1    
    --Template1.2

Template2
    --Template2.1

我希望通过编程方式为子节点（Template1.1）设置IsSelected TreeViewItem属性，但它只为父节点（Template1）提供了

我试图从treeview获取项目，但它仅提供父节点

{
.
.
.
.

templatetree.ItemsSource = nodeList;
}

TreeViewItem tr = (TreeViewItem)templatetree.ItemContainerGenerator.ContainerFromItem(templatetree.Items[0]);\\This lines gives me parent node of Template Type.

如何为子节点设置IsSelected属性？

预期结果：Child item selection

Answer 1

要为第二级添加样式，您需要在HierarchicalDataTemplate中设置它，如下所示

<HierarchicalDataTemplate DataType="{x:Type Tree:Templates}" ItemsSource="{Binding Members}">
    <StackPanel Orientation="Horizontal">
        <Image Source="../Images/template.png"
                   Height="22" Width="22" Margin="0,0,5,0"/>
        <TextBlock Text="{Binding Name}"
                       Style="{StaticResource PopupBodyTextStyle}"
                       FontFamily="{StaticResource Symbol}" MouseLeftButtonDown="HeaderNode_MouseLeftButtonDown"/>
        <TextBlock Text=" [" Foreground="{StaticResource HighlightBrush}"/>
        <TextBlock Text="{Binding Members.Count}" Foreground="{StaticResource HighlightBrush}"/>
        <TextBlock Text="]" Foreground="{StaticResource HighlightBrush}"/>
    </StackPanel>
    <HierarchicalDataTemplate.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsSelected" Value="False" />
        </Style>
    </HierarchicalDataTemplate.ItemContainerStyle>
</HierarchicalDataTemplate>

下面是样式多级TreeViewItem

的示例

    <DataTemplate x:Key="MenuItemTemplate" >
       <TreeViewItem/>
    </DataTemplate>
    <HierarchicalDataTemplate x:Key="ThirdLevel" ItemTemplate="{StaticResource MenuItemTemplate}">
       <TextBlock Text="Text" />
       <HierarchicalDataTemplate.ItemContainerStyle>
          <Style>
          <!--  3rd STYLE HERE  -->
          </Style>
       </HierarchicalDataTemplate.ItemContainerStyle>
     </HierarchicalDataTemplate>

     <HierarchicalDataTemplate x:Key="SecondLevel" ItemTemplate="{StaticResource ThirdLevel}">
        <TextBlock Text="Text" />
        <HierarchicalDataTemplate.ItemContainerStyle>
           <Style>
               <!--  2nd STYLE HERE  -->
           </Style>
        </HierarchicalDataTemplate.ItemContainerStyle>
      </HierarchicalDataTemplate>

     <TreeView ItemTemplate="{StaticResource SecondLevel}">
         <TreeView.ItemContainerStyle>
         <Style>
             <!--  1st Level Style  -->
          </Style>
         </TreeView.ItemContainerStyle>
     </TreeView>

我有WPF treeviewitem的问题

1 个答案: