Question

我有一个这种类型的XML文档。

<?xml version="1.0" encoding="utf-8"?>
<Parameters>
  <Param Name="Father0_0" ID="1">
    <Param0 Name="Father0_1" ID="2">
      <Param1 Name="Father0_2" ID="3">
        <Param2 Name="Child0_0" ID_ch="1"/>
      </Param1>
      <Param1 Name="Father0_3" ID="4">
        <Param2 Name="Father0_4" ID="5">
          <Param3 Name="Child0_3" ID_ch="2"/>
        </Param2>
      </Param1>
    </Param0>
  </Param>
  <Param Name="Father1_0" ID="6">
    <Param0 Name="Child1_0" ID_ch="3" />
  </Param>
  <Param Name="Father2_0" ID="7">
    <Param1 Name="Child2_0" ID_ch="3"/>
  </Param>
 <Param Name="Child3_0" ID_ch="4"/>
</Parameters>

.CS

所以我加载了我的XML

XmlDataProvider _xml = FindResource("xmldata") as XmlDataProvider;
var xmlDocument = new XmlDocument();
xmlDocument.Load("34.xml");
_xml.Document = xmlDocument;

如果我按照XAML中的说明进行操作，我会在树视图中获取Chechkboks所有项目吗？

.XAML

<Window.Resources>
 <XmlDataProvider x:Key="xmldata" XPath="Parameters"/>
<!--The same is done for the Param0,Param1,Param2,Param3 changing DataType=""-->
 <HierarchicalDataTemplate DataType="Param" ItemsSource="{Binding XPath= ./*}">
   <StackPanel Orientation="Horizontal">
    <CheckBox Margin="5,0,0,0" Content="{Binding XPath=@Name}" />
   </StackPanel>
 </HierarchicalDataTemplate>
<!-------------------------------->
</Window.Resources>
<Grid>
 <TreeView ItemsSource="{Binding Source={StaticResource xmldata}, XPath=Param}"  />
</Grid>

如何仅为儿童制作CheckBox。

Answer 1

您可以检查TreeViewItem是否没有项目，那么这是子节点，您可以将CheckBox.Visibility绑定为：

     <HierarchicalDataTemplate DataType="Param" ItemsSource="{Binding XPath= ./*}">
        <StackPanel Orientation="Horizontal">
            <CheckBox Margin="5,0,0,0" Content="{Binding XPath=@Name}" >
                <CheckBox.Style>
                    <Style TargetType="CheckBox">
                        <Setter Property="Visibility" Value="Collapsed"/>
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding Items.Count, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type TreeViewItem}}}" Value="0">
                                <Setter Property="Visibility" Value="Visible"/>
                            </DataTrigger>
                        </Style.Triggers>
                    </Style>
                </CheckBox.Style>
            </CheckBox>
        </StackPanel>
    </HierarchicalDataTemplate>

Answer 2

在XML数据的情况下自定义TreeView的更通用方法是创建自己的数据模板选择器：

public class ItemTemplateSelector : DataTemplateSelector
{
    public DataTemplate ParentTemplate { get; set; }

    public DataTemplate ChildTemplate { get; set; }

    public override DataTemplate SelectTemplate(object item, DependencyObject container)
    {
        var element = item as XElement;
        if (element != null)
        {
            return element.Elements().Any() ? ParentTemplate : ChildTemplate;
        }

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

以下是如何在XAML中使用它：

<Window x:Class="WpfApplication2.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfApplication2"
        Title="MainWindow" Height="350" Width="525">

    <Window.Resources>
        <local:ItemTemplateSelector x:Key="ItemTemplateSelectorKey">

            <local:ItemTemplateSelector.ParentTemplate>
                <HierarchicalDataTemplate ItemsSource="{Binding Elements}">
                    <TextBlock Text="{Binding Attribute[Name].Value}"/>
                </HierarchicalDataTemplate>
            </local:ItemTemplateSelector.ParentTemplate>

            <local:ItemTemplateSelector.ChildTemplate>
                <DataTemplate>
                    <CheckBox Content="{Binding Attribute[Name].Value}"/>
                </DataTemplate>
            </local:ItemTemplateSelector.ChildTemplate>

        </local:ItemTemplateSelector>
    </Window.Resources>

    <TreeView ItemsSource="{Binding Root.Elements}"
              ItemTemplateSelector="{StaticResource ItemTemplateSelectorKey}"/>
</Window>

代码隐藏：

public partial class MainWindow : Window
{
    public MainWindow()
    {
        InitializeComponent();
        DataContext = XDocument.Parse(Properties.Resources.XmlFile);
    }
}

结果如下：

请注意，我已使用XDocument API代替XmlDocument一个。

<强> UPD
ChildTemplate被简化了一点，以便更具可读性，但这在内容中显示下划线存在问题（例如，请参阅this答案进行解释）。

只有儿童的Chekbox TreeView

2 个答案: