Question

我对XAML和WPF中数据的约束有些问题。具体地说,我试图将XmlDataProvider的数据绑在ListBox上。

问题是,当我在2010年视觉工作室的设计模式中时, xml 的项目出现正确, 但当我运行应用程序时, 列表框是空的。

我的Xaml长的是这样的。我不使用后面的代码,所以这里就只有:

<Window x:Class="WpfTest9_Binding.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="309" Width="622">
    <Window.DataContext>
        <XmlDataProvider XPath="Servers">
            <x:XData>
                <Servers>
                    <Server name="Server01" active="true" />
                    <Server name="Server02" active="false" />
                    <Server name="Testserver01" active="true" />
                    <Server name="Testserver02" active="true" />
                </Servers>
            </x:XData>
        </XmlDataProvider>
    </Window.DataContext>
    <Grid>
        <ListBox ItemsSource="{Binding XPath=*}" Margin="12">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <Border CornerRadius="5" Margin="5" BorderThickness="2" BorderBrush="#FFC14343">
                        <StackPanel Orientation="Horizontal" Margin="5">
                            <CheckBox IsChecked="{Binding XPath=@active}" />
                            <Label Content="{Binding XPath=@name}" />
                        </StackPanel>
                    </Border>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>
    </Grid>
</Window>

正如我上面所说,奇怪的是,它看起来在设计模式中起作用,但当我运行程序时却无法填满列表框。我也不会收到任何错误信息或警告。

有什么不对劲吗?

Answer 1

Ok, the solution was surprisingly simple. As pointed out in this post, Listbox content not being populated with content from xml when using XmlDataProvider , all I had to do was to add an empty namespace attribute to the xml element. Like this:

<Servers xmlns="">
    <Server name="Server01" active="true" />
    <!-- ... -->
</Servers>

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