如何将具有命名空间的 XML 绑定到 WPF DataGrid?

发布于 2024-09-07 07:19:15 字数 2258 浏览 4 评论 0原文

我有一个用例,需要将 XML 文件中的数据绑定到 WPF DataGrid。我准备这个示例是为了演示我将在最终代码中做什么。

这是 Books.xml:


 <?xml version="1.0" encoding="utf-8" ?>
 <library>
   <books>
  <book id="1" name="The First Book" author="First Author">
    First Book Content
  </book>
  <book id="2" name="The Second Book" author="Second Author">
    Second Book Content
  </book>
   </books>
 </library>

以下是我如何将其绑定到我的 DataGrid 控件。第一个 XAML:


<Window x:Class="LinqToXmlBinding.Window1"
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit"
 Title="Window1" Height="300" Width="400">
 <Grid>
  <Grid.ColumnDefinitions>
   <ColumnDefinition Width="268*" />
   <ColumnDefinition Width="110*" />
  </Grid.ColumnDefinitions>
  <toolkit:DataGrid Name="xmlBoundDataGrid" Margin="1" ItemsSource="{Binding Path=Elements[book]}">
   <toolkit:DataGrid.Columns>
    <toolkit:DataGridTextColumn Header="Book ID" Binding="{Binding Path=Attribute[id].Value}"/>
    <toolkit:DataGridTextColumn Header="Book Name" Binding="{Binding Path=Attribute[name].Value}"/>
    <toolkit:DataGridTextColumn Header="Content" Binding="{Binding Path=Value}"/>
   </toolkit:DataGrid.Columns>
  </toolkit:DataGrid>
  <StackPanel Name="myStackPanel" Grid.Column="1">
   <Button Name="bindToXmlButton" Click="bindToXmlButton_Click">Bind To XML</Button>
  </StackPanel>
 </Grid>
</Window>

然后是 C# 代码:


const string _xmlFilePath = "..//..//Books.xml";
private void bindToXmlButton_Click(object sender, RoutedEventArgs e)
{
     XElement books = XElement.Load(_xmlFilePath).Element(myNameSpace + "books");
     xmlBoundDataGrid.DataContext = books;
}

现在,如果我在 Books.XML 的根元素处定义了一个 XML 命名空间为 http://my.namespace.com/books;我知道我可以像这样以编程方式获取该命名空间:


XNamespace myNameSpace = XElement.Load(_xmlFilePath).Attribute("xmlns").Value;

但是,如何在 XAML 中检索此命名空间以便访问“book”元素?这方面的最佳实践是什么?

非常感谢。

I have a use-case where I need to bind data from an XML file to a WPF DataGrid. I prepared this example to demonstrate what I'll be doing in my final code.

This is Books.xml:


 <?xml version="1.0" encoding="utf-8" ?>
 <library>
   <books>
  <book id="1" name="The First Book" author="First Author">
    First Book Content
  </book>
  <book id="2" name="The Second Book" author="Second Author">
    Second Book Content
  </book>
   </books>
 </library>

And here is how I bind it my DataGrid control. First XAML:


<Window x:Class="LinqToXmlBinding.Window1"
 xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 xmlns:toolkit="http://schemas.microsoft.com/wpf/2008/toolkit"
 Title="Window1" Height="300" Width="400">
 <Grid>
  <Grid.ColumnDefinitions>
   <ColumnDefinition Width="268*" />
   <ColumnDefinition Width="110*" />
  </Grid.ColumnDefinitions>
  <toolkit:DataGrid Name="xmlBoundDataGrid" Margin="1" ItemsSource="{Binding Path=Elements[book]}">
   <toolkit:DataGrid.Columns>
    <toolkit:DataGridTextColumn Header="Book ID" Binding="{Binding Path=Attribute[id].Value}"/>
    <toolkit:DataGridTextColumn Header="Book Name" Binding="{Binding Path=Attribute[name].Value}"/>
    <toolkit:DataGridTextColumn Header="Content" Binding="{Binding Path=Value}"/>
   </toolkit:DataGrid.Columns>
  </toolkit:DataGrid>
  <StackPanel Name="myStackPanel" Grid.Column="1">
   <Button Name="bindToXmlButton" Click="bindToXmlButton_Click">Bind To XML</Button>
  </StackPanel>
 </Grid>
</Window>

Then, C# code:


const string _xmlFilePath = "..//..//Books.xml";
private void bindToXmlButton_Click(object sender, RoutedEventArgs e)
{
     XElement books = XElement.Load(_xmlFilePath).Element(myNameSpace + "books");
     xmlBoundDataGrid.DataContext = books;
}

Now, if I defined an XML namespace at the root element of Books.XML to be http://my.namespace.com/books; I know I can get that namespace programmatically like so:


XNamespace myNameSpace = XElement.Load(_xmlFilePath).Attribute("xmlns").Value;

But, how can I retrieve this namespace in XAML in order to access the "book" element? And what are the best practices in that regard?

Thank you very much.

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浮世清欢 2024-09-14 07:19:15

抱歉,如果我弄错了,但是

  • 如果您需要从默认命名空间访问元素,例如 xmlns="...",您应该使用常规语法,例如 Path=Attribute[name].Value

  • 如果您的 XML 具有带前缀的命名空间,例如 xmlns:ns="... " 以及此命名空间内的元素,例如 ,您可以尝试使用 Path=Elements["ns:book"]

希望这会有所帮助。

Sorry if I got you wrong, but

  • If you need to access elements from default namespace like xmlns="...", you should use regular syntax like Path=Attribute[name].Value

  • If you have XML with namespace with prefix, like xmlns:ns="..." and elements inside this namespace like , you may try to use Path=Elements["ns:book"]

Hope this helps.

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