将列表框绑定到 XmlDocument

发布于 2024-08-22 17:03:42 字数 1081 浏览 6 评论 0原文

有人可以帮我解决为什么我的列表框是空的吗?

XmlDocument 包含以下 XML:

<Config>
  <Tabs>
    <Tab Name="Test1" />
    <Tab Name="Test2" />
  </Tabs>
</Config>

在我的 XAML 文件中,我尝试了以下操作,

<Window>
  <Grid>
     <ListBox DataContext="{Binding {StaticResource Data}, XPath=//Tabs}" ItemsSource="{Binding XPath=Tab/@Name}">
     </ListBox>
  </Grid>
<Window>

我知道我还没有设置与 name 属性的绑定,但如果它正常工作,不应该为每个选项卡节点显示 XmlDocument.XmlNode.ToString() ?

我的 C# 构造函数代码如下:

InitializeComponent();
this.doc = new XmlDocument();
doc.LoadXml(config.document.OuterXml);
XmlDataProvider provider = (XmlDataProvider)Resources["Data"];
provider.Document = doc;
provider.Refresh();

config.document.OuterXml 是包含上述 xml 的有效文档。

我使用 Collections 处理过程代码,但我一直在尝试找出如何直接绑定到 XML。

更新:ListBox 为空

现在没有绑定错误,但我的列表框为空,我仔细检查了我的 XML 文件,甚至执行了 MessageBox.Show(provider.Document.OuterXML) 并可以确认 XmlDocument 确实具有正确的内容节点。

提前致谢

Could someone help me out, to why my listbox is empty?

The XmlDocument contains the following XML:

<Config>
  <Tabs>
    <Tab Name="Test1" />
    <Tab Name="Test2" />
  </Tabs>
</Config>

In my XAML file I have tried the following

<Window>
  <Grid>
     <ListBox DataContext="{Binding {StaticResource Data}, XPath=//Tabs}" ItemsSource="{Binding XPath=Tab/@Name}">
     </ListBox>
  </Grid>
<Window>

I know I haven't set up the binding to name attribute but shouldn't this display XmlDocument.XmlNode.ToString() for each Tab Node if it was working?

My C# Constructor Code behind:

InitializeComponent();
this.doc = new XmlDocument();
doc.LoadXml(config.document.OuterXml);
XmlDataProvider provider = (XmlDataProvider)Resources["Data"];
provider.Document = doc;
provider.Refresh();

With config.document.OuterXml being a valid document containing the above xml.

I got this working with procedural code using Collections, but I have been trying to figure out how to bind directly to XML.

Update: ListBox empty

Now there is no binding errors, but my listbox is coming up empty, I have double checked my XML file, and even did MessageBox.Show(provider.Document.OuterXML) and can confirm that the XmlDocument does have the correct nodes.

Thanks in advance

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一指流沙 2024-08-29 17:03:42

如果将 XmlDataProviderDocument 属性设置为 XmlDocument,则每当 XmlNode.NodeChanged 时,它都会刷新绑定。 code> 事件被引发。由于 Document 不是依赖属性,因此您无法绑定到它,因此您必须在代码中设置它;这应该可以解决问题:

在您的 XAML 中:

<Window.Resources>
   <XmlDataProvider x:Key="Data"/>
</Window.Resources>

...

<ListBox 
    DataContext="{Binding {StaticResource Data}, XPath=Config/Tabs}"
    ItemsSource="{Binding XPath=Tab/@Name}"/>

在窗口的构造函数中:

InitializeComponent();
XmlDocument d = new XmlDocument();
d.Load("MyData.xml");
XmlDataProvider p = (XmlDataProvider)Resources["Data"];
p.Document = d;

现在,您对 XmlDocument 所做的任何更改都将反映在 ListBox 中。

编辑:

我无法告诉你你做错了什么,但当你将你正在做的事情与下面的内容(这是一个完整的工作示例)进行比较时,也许你就能知道。

Window1.xaml:

<Window x:Class="Test.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1">
    <Window.Resources>
        <XmlDataProvider x:Key="Data"/>
    </Window.Resources>
    <ListBox 
        DataContext="{Binding Source={StaticResource Data}, XPath=Config}" 
        ItemsSource="{Binding XPath=Tabs/Tab/@Name}"/>     
</Window>

Window1.xaml.cs:

using System.Windows;
using System.Windows.Data;
using System.Xml;

namespace Test
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            XmlDocument d = new XmlDocument();
            string xml = @"<Config><Tabs><Tab Name='foo'/><Tab Name='bar'/></Tabs></Config>";
            d.LoadXml(xml);
            ((XmlDataProvider) Resources["Data"]).Document = d;
        }
    }
}

If you set the XmlDataProvider's Document property to your XmlDocument, it will refresh the bindings any time the XmlNode.NodeChanged event is raised. Since Document isn't a dependency property, you can't bind to it, so you have to set it in code; this should do the trick:

In your XAML:

<Window.Resources>
   <XmlDataProvider x:Key="Data"/>
</Window.Resources>

...

<ListBox 
    DataContext="{Binding {StaticResource Data}, XPath=Config/Tabs}"
    ItemsSource="{Binding XPath=Tab/@Name}"/>

In the window's constructor:

InitializeComponent();
XmlDocument d = new XmlDocument();
d.Load("MyData.xml");
XmlDataProvider p = (XmlDataProvider)Resources["Data"];
p.Document = d;

Now any changes you make to your XmlDocument will be reflected in the ListBox.

Edit:

I can't tell you what you're doing wrong, but perhaps you'll be able to when you compare what you're doing with the below, which is a complete working example.

Window1.xaml:

<Window x:Class="Test.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1">
    <Window.Resources>
        <XmlDataProvider x:Key="Data"/>
    </Window.Resources>
    <ListBox 
        DataContext="{Binding Source={StaticResource Data}, XPath=Config}" 
        ItemsSource="{Binding XPath=Tabs/Tab/@Name}"/>     
</Window>

Window1.xaml.cs:

using System.Windows;
using System.Windows.Data;
using System.Xml;

namespace Test
{
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            XmlDocument d = new XmlDocument();
            string xml = @"<Config><Tabs><Tab Name='foo'/><Tab Name='bar'/></Tabs></Config>";
            d.LoadXml(xml);
            ((XmlDataProvider) Resources["Data"]).Document = d;
        }
    }
}
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