Question

我有以下测试案例xaml。

<Window.Resources>
    <XmlDataProvider x:Key="testDS1">
        <x:XData>
            <root xmlns="">
                <item>1</item>
                <item>1</item>
            </root>
        </x:XData>
    </XmlDataProvider>
</Window.Resources>
<StackPanel>
    <ListBox ItemsSource="{Binding Source={StaticResource testDS1},XPath=/root/item}"/>
    <Button Content="Change" Click="OnChangeClicked"/>
</StackPanel>

这显示了一个数字箱。然后我执行这项法典。

    public void OnChangeClicked(object sender, RoutedEventArgs e)
    {
        XmlDataProvider ds = Resources["testDS1"] as XmlDataProvider;
        string xml = "<root><item>1</item></root>";
        XmlDocument doc = new XmlDocument();
        doc.LoadXml(xml);
        ds.Document = doc;
    }

造成这种警告。

System.Windows.Data Error: 43 : BindingExpression with XPath cannot bind to non-XML object.; XPath= /root/item  BindingExpression:Path=; DataItem= XmlDataCollection  (HashCode=40644060); target element is  ListBox  (Name=  ); target property is  ItemsSource  (type  IEnumerable ) XmlDataCollection: MS.Internal.Data.XmlDataCollection

然而,清单Box受到正确约束,具有正确的价值。 http://social.msdn.microsoft.com/Forums/en-US/wpf/thread/711d3735-34c7-4358-8787-958752bcaabe“rel=”thread。如何消除这一警告? 我尝试了具有约束力的行动。明确但甚至触发了这一警告。是否应该与这一警告相处?

Answer 1

最后,找到了答案。

public void OnChangeClicked(object sender, RoutedEventArgs e)
{
    XmlDataProvider ds = Resources["testDS1"] as XmlDataProvider;
    string xml = "<root><item>1</item></root>";
    XmlDocument doc = new XmlDocument();
    doc.LoadXml(xml);
    using(ds.DeferRefresh())
    {
       ds.Document = doc;
       ds.XmlNamespaceManager = new XmlNamespaceManager(doc.NameTable);
    }
}

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