我想使用 XML 文档的数据绑定(bind)来填充一个显示人员列表详细信息的简单表单。我已经完成了所有设置，现在可以正常工作了:

<Window x:Class="DataBindingSample.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="xmlProvider" XPath="People" Source="c:\someuri.xml"/>
</Window.Resources>
<Grid>        
    <ListBox Name="personList" ItemsSource="{Binding Source={StaticResource xmlProvider}, XPath=Person}">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding XPath=Name}" />
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

    <GroupBox Header="GroupBox" Name="groupBox1" DataContext="{Binding ElementName=personList, Path=SelectedItem}">
        <Grid>
            <TextBox Name="nameText" Text="{Binding XPath=Name}"/>
            <ComboBox Name="genderCombo" Text="{Binding XPath=Gender}">
                <ComboBoxItem>Male</ComboBoxItem>
                <ComboBoxItem>Female</ComboBoxItem>
            </ComboBox>
        </Grid>
    </GroupBox>
</Grid>
</Window>

(为清晰起见，所有位置/布局元素已被删除)

现在效果很好!如果我为它提供一些与提供的路径匹配的 XML，我会在列表框中获得一个名称列表，单击时会在相应的字段中显示名称和性别。当我开始尝试在我的 XML 源代码中使用 namespace 时，问题就来了。然后 XAML 变为如下所示:

<Window x:Class="DataBindingSample.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Window1">
<Window.Resources>
    <XmlNamespaceMappingCollection x:Key="namespaceMappings">
        <XmlNamespaceMapping Uri="http://www.mynamespace.com" Prefix="mns"/>
    </XmlNamespaceMappingCollection>
    <XmlDataProvider x:Key="xmlProvider" XmlNamespaceManager="{StaticResource namespaceMappings}" XPath="mns:People" Source="c:\someuriwithnamespaces.xml"/>
</Window.Resources>
<Grid>        
    <ListBox Name="personList" ItemsSource="{Binding Source={StaticResource xmlProvider}, XPath=mns:Person}">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <TextBlock Text="{Binding XPath=mns:Name}" />
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>

    <GroupBox Header="GroupBox" Name="groupBox1" DataContext="{Binding ElementName=personList, Path=SelectedItem}">
        <Grid>
            <TextBox Name="nameText" Text="{Binding XPath=mns:Name}"/>
            <ComboBox Name="genderCombo" Text="{Binding XPath=mns:Gender}">
                <ComboBoxItem>Male</ComboBoxItem>
                <ComboBoxItem>Female</ComboBoxItem>
            </ComboBox>
        </Grid>
    </GroupBox>
</Grid>
</Window>

使用此代码(当然还有适当命名空间的 xml)，列表框仍会正确显示姓名，但单击这些姓名不再更新姓名和性别字段!我怀疑 xml namespace 以某种方式对 groupbox 的 DataContext 做出不利 react ，但我不确定原因或方式。有谁知道如何在这种情况下使用 XML namespace ？

最佳答案

我也是asked this question在 MSDN WPF 表单上。 Marco Zhou 用这个回答了我，这最终是我要寻找的答案。为了任何寻找相同答案的人的利益，我在这里复制了它:

This works:

    <XmlDataProvider x:Key="dataProvider"
                     XmlNamespaceManager="{StaticResource namespaceMappings}"
                     XPath="p:players/p:player">
        <x:XData>
            <p:players xmlns:p="http://www.footballism.com/2005/SoccerPlayers">
                <p:player>
                    <p:fullName>Sebastian Batistuta</p:fullName>
                    <p:age>26</p:age>
                </p:player>
                <p:player>
                    <p:fullName>Andriey Shevchenko</p:fullName>
                    <p:age>30</p:age>
                </p:player>
                <p:player>
                    <p:fullName>Paviel Nedved</p:fullName>
                    <p:age>21</p:age>
                </p:player>
                <p:player>
                    <p:fullName>David Beckham</p:fullName>
                    <p:age>19</p:age>
                </p:player>
            </p:players>
        </x:XData>
    </XmlDataProvider>
</Page.Resources>
<StackPanel>
    <TextBlock
        Text="{Binding XPath=p:fullName}"
        FontWeight="Bold"
        Binding.XmlNamespaceManager="{StaticResource namespaceMappings}"
        DataContext="{Binding ElementName=listBox, Path=SelectedItem}"/>
    <ListBox ItemsSource="{Binding Source={StaticResource dataProvider}}"
             x:Name="listBox"
             DisplayMemberPath="p:fullName">
    </ListBox>
</StackPanel> </Page>

I suppose after looking at the code, you should be able to understand why it works after specify the Binding.XmlNamespaceManager attached property for TextBlock.

ListBox is data bound to a data provider which has xml namespace mapping information, but the binding on the TextBlock doesn't have this information, that's why it fails.

Actually, when doing master detail data binding, it's more appropriate to do something like the following:

    <XmlDataProvider x:Key="dataProvider"
                     XmlNamespaceManager="{StaticResource namespaceMappings}"
                     XPath="p:players/p:player">
        <x:XData>
            <p:players xmlns:p="http://www.footballism.com/2005/SoccerPlayers">
                <p:player>
                    <p:fullName>Sebastian Batistuta</p:fullName>
                    <p:age>26</p:age>
                </p:player>
                <p:player>
                    <p:fullName>Andriey Shevchenko</p:fullName>
                    <p:age>30</p:age>
                </p:player>
                <p:player>
                    <p:fullName>Paviel Nedved</p:fullName>
                    <p:age>21</p:age>
                </p:player>
                <p:player>
                    <p:fullName>David Beckham</p:fullName>
                    <p:age>19</p:age>
                </p:player>
            </p:players>
        </x:XData>
    </XmlDataProvider>
</Page.Resources>
<StackPanel DataContext="{Binding Source={StaticResource dataProvider}}">
    <TextBlock
        Text="{Binding XPath=p:fullName}"
        FontWeight="Bold"/>
    <ListBox ItemsSource="{Binding}"
             x:Name="listBox"
             DisplayMemberPath="p:fullName"
             IsSynchronizedWithCurrentItem="True">
    </ListBox>
</StackPanel> </Page>

Hope this clears things up a little bit.

关于c# - 带有命名空间的 XML 数据绑定(bind)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/190102/