[英]How to Bind an XmlDataProvider Class Property to a XAML TreeView
I would like to bind a TreeView control I have defined in XAML to a property in its code-behind class. 我想将XAML中定义的TreeView控件绑定到其代码隐藏类中的属性。 I already read through a WPF Basic Data Binding FAQ , but the example in the comments at the very bottom of the page didn't work when I tried to use an XmlDataProvider as the binding source.
我已经阅读了WPF基本数据绑定常见问题解答 ,但是当我尝试使用XmlDataProvider作为绑定源时,页面底部注释中的示例不起作用。
How can I modify the following code so that the binding is defined in the XAML, rather than in the class's constructor? 如何修改以下代码,以便在XAML中而不是在类的构造函数中定义绑定? In other words, how can I modify the TreeView's
ItemsSource
attribute to reference a property in its code-behind class? 换句话说,如何修改TreeView的
ItemsSource
属性以引用其代码隐藏类中的属性?
<UserControl x:Class="SomeNamespace.SomeClass"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<UserControl.Resources>
<XmlDataProvider x:Key="SomeTreeData" />
</UserControl.Resources>
<TreeView Name="SomeTree" ItemsSource="{Binding Source={StaticResource SomeTreeData}, XPath=*}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="items" ItemsSource="{Binding XPath=*}">
<TextBlock Text="{Binding XPath=@Header}" />
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="item" ItemsSource="{Binding XPath=*}">
<TextBlock Text="{Binding XPath=@Header}" />
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</UserControl>
public partial class SomeClass : UserControl
{
public SomeClass()
{
InitializeComponent();
XmlDataProvider lSomeTreeData
= this.FindResource("SomeTreeData") as XmlDataProvider;
lSomeTreeData.Document = new XmlDocument();
lSomeTreeData.Document.LoadXml("<items xmlns=\"\" Header=\"Some items\"><item Header=\"Some item\" /></items>");
}
}
Note the {SOME MAGIC}
in the TreeView's ItemsSource
attribute. 注意TreeView的
ItemsSource
属性中的{SOME MAGIC}
。
<UserControl x:Class="SomeNamespace.SomeClass"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<TreeView Name="SomeTree" ItemsSource="{Binding Source={SOME MAGIC}, XPath=*}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="items" ItemsSource="{Binding XPath=*}">
<TextBlock Text="{Binding XPath=@Header}" />
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="item" ItemsSource="{Binding XPath=*}">
<TextBlock Text="{Binding XPath=@Header}" />
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</UserControl>
public partial class SomeClass : UserControl
{
public XmlDataProvider SomeXmlDataProvider { get; set; }
public SomeClass()
{
InitializeComponent();
this.SomeXmlDataProvider = new XmlDataProvider();
this.SomeXmlDataProvider.Document = new XmlDocument();
this.SomeXmlDataProvider.Document.LoadXml("<items xmlns=\"\" Header=\"Some items\"><item Header=\"Some item\" /></items>");
}
}
I've discovered that one option is to set the control's DataContext
: 我发现一种选择是设置控件的
DataContext
:
<UserControl x:Class="SomeNamespace.SomeClass"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<TreeView ItemsSource="{Binding XPath=/items}">
<TreeView.Resources>
<HierarchicalDataTemplate DataType="items" ItemsSource="{Binding XPath=*}">
<TextBlock Text="{Binding XPath=@Header}" />
</HierarchicalDataTemplate>
<HierarchicalDataTemplate DataType="item" ItemsSource="{Binding XPath=*}">
<TextBlock Text="{Binding XPath=@Header}" />
</HierarchicalDataTemplate>
</TreeView.Resources>
</TreeView>
</UserControl>
public partial class SomeClass : UserControl
{
public XmlDataProvider SomeXmlDataProvider { get; set; }
public SomeClass()
{
InitializeComponent();
this.SomeXmlDataProvider = new XmlDataProvider();
this.SomeXmlDataProvider.Document = new XmlDocument();
this.SomeXmlDataProvider.Document.LoadXml("<items Header=\"Some items\"><item Header=\"Some item\" /></items>");
this.DataContext = this.SomeXmlDataProvider.Document;
}
}
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