使用TreeView在WPF中获取XML属性 [英] Get XML Attributes in WPF with a TreeView

问题描述

我正在尝试从XDocument在WPF中创建树视图. 到目前为止，我可以创建具有所有节点和值的树. 现在，我想添加所有属性.我的问题从这里开始;-)

I am trying to create a treeview in WPF from an XDocument. So far I can create the tree with all nodes and values. Now I would like to add all attributes. Here my problems start ;-)

相关的XAML如下所示:

The relevant XAML looks like this:

<Window.Resources>
    <HierarchicalDataTemplate x:Key="NodeTemplate">
        <StackPanel Orientation="Horizontal" Focusable="False">
            <TextBlock x:Name="tbName" Text="dummy" />
            <ItemsControl ItemsSource="{Binding Attributes}">
                <ItemsControl.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <TextBlock Text="{Binding Name}" />
                        </Grid>
                    </DataTemplate>
                </ItemsControl.ItemTemplate>
            </ItemsControl>
        </StackPanel>
        <HierarchicalDataTemplate.ItemsSource>
            <Binding Path="Elements" />
        </HierarchicalDataTemplate.ItemsSource>
        <HierarchicalDataTemplate.Triggers>
            <DataTrigger Binding="{Binding Path=NodeType}" Value="Element">
                <Setter TargetName="tbName" Property="Text" Value="{Binding Path=Name}" />
            </DataTrigger>
            <DataTrigger Binding="{Binding Path=FirstNode.NodeType}" Value="Text">
                <Setter TargetName="tbName" Property="Text">
                    <Setter.Value>
                        <MultiBinding StringFormat="{}{0} = {1}">
                            <Binding Path="Name"/>
                            <Binding Path="FirstNode.Value"/>
                        </MultiBinding>
                    </Setter.Value>
                </Setter>
            </DataTrigger>
        </HierarchicalDataTemplate.Triggers>
    </HierarchicalDataTemplate>
</Window.Resources>
...
<ScrollViewer Grid.Column="1" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto">
    <TreeView x:Name="LizenzAnsicht"
              ItemsSource="{Binding Path=Root.Elements}"
              ItemTemplate="{StaticResource ResourceKey=NodeTemplate}"
              />
</ScrollViewer>

加载XDocument的代码如下:

The Code behind loading the XDocument looks like this:

LadeDatei.LizenzProjekt = XDocument.Load(@"C:\Users\Bernd\Documents\trash\theXMLFile.xml");
LizenzAnsicht.DataContext = LadeDatei.LizenzProjekt;

如前所述，除了没有显示任何属性外，树形结构看起来还不错. Visual Studio在Direktfenster(直接窗口?)中显示了一些错误:

As said the tree structure looks quite good except that no attributes show up. Visual Studio show some errors in the Direktfenster (direct windows?):

System.Windows.Data错误:40:BindingExpression路径错误:在对象""XElement"(HashCode = 51812368)'上找不到"Attributes"属性. BindingExpression:Path =属性; DataItem ='XElement'(HashCode = 51812368);目标元素是'ItemsControl'(Name ='');目标属性为"ItemsSource"(类型为"IEnumerable")

System.Windows.Data Error: 40 : BindingExpression path error: 'Attributes' property not found on 'object' ''XElement' (HashCode=51812368)'. BindingExpression:Path=Attributes; DataItem='XElement' (HashCode=51812368); target element is 'ItemsControl' (Name=''); target property is 'ItemsSource' (type 'IEnumerable')

有人暗示我需要做些什么才能使其正常工作吗?

Any hints what I need to do to get it working?

问候 伯恩德

推荐答案

Attributes()是XElement的一种方法.不支持绑定到方法.

Attributes() is a method of XElement. Binding to methods is not supported.

我将使用转换器从XElement获取属性以进行绑定:

I would use a converter to get attributes from XElement for binding purpose:

public class XAttributesConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var xe = value as XElement;
        if (xe == null)
            return Enumerable.Empty<XAttribute>();

        return xe.Attributes();
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

和

<Window.Resources>
  <wpfDemos:XAttributesConverter x:Key="AttrConverter"/>
<Window.Resources>

<ItemsControl ItemsSource="{Binding Converter={StaticResource AttrConverter}}">

这篇关于使用TreeView在WPF中获取XML属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！