Question

我有一个WPF网格

<Window x:Class="LabsRSS.Window1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Poperecinii Timur Lab" Height="404" Width="588">
<Grid x:Name="blah">
    <Grid.Resources>
        <XmlDataProvider x:Key="flickrdata" Source="http://api.flickr.com/services/feeds/photos_public.gne?tags=dog&amp;lang=en-us&amp;format=rss_200">
            <XmlDataProvider.XmlNamespaceManager>
                <XmlNamespaceMappingCollection>
                    <XmlNamespaceMapping Prefix="media" Uri="http://search.yahoo.com/mrss/"/>
                </XmlNamespaceMappingCollection>
            </XmlDataProvider.XmlNamespaceManager>
        </XmlDataProvider>
        <DataTemplate x:Key="itemTemplate">
            <Image Width="75" Height="75" Source="{Binding Mode=OneWay, XPath=media:thumbnail/@url}"/>
        </DataTemplate>
        <ControlTemplate x:Key="controlTemplate" TargetType="{x:Type ItemsControl}">
            <WrapPanel IsItemsHost="True" Orientation="Horizontal"/>
        </ControlTemplate>
    </Grid.Resources>
    <ItemsControl
   Width="375"
   ItemsSource="{Binding Mode=Default, Source={StaticResource flickrdata}, XPath=/rss/channel/item}"
   ItemTemplate="{StaticResource itemTemplate}"
   Template="{StaticResource controlTemplate}">
    </ItemsControl>
    <TextBox Height="23" Margin="193,0,213,24" Name="textBox1" VerticalAlignment="Bottom" TextChanged="textBox1_TextChanged" />
</Grid>

我尝试做的是用我自己的TextBox输入替换标签。

 private void textBox1_TextChanged(object sender, TextChangedEventArgs e)
    {
        XmlDataProvider dataProvider = (XmlDataProvider)this.blah.FindResource("flickrdata");
        XmlNamespaceManager xnManager = dataProvider.XmlNamespaceManager;
        string newSource = "http://api.flickr.com/services/feeds/photos_public.gne?tags=flower&amp;lang=en-us&amp;format=rss_200";
        newSource = Regex.Replace(newSource, "(^.*tags=)(.+?)(&amp;.*$)", String.Format("{0}{1}{2}", "$1", textBox1.Text, "$3"));
        dataProvider.Source = new Uri(newSource);
        dataProvider.XmlNamespaceManager = xnManager;
        dataProvider.Refresh();

    }

现在uri似乎设置得很好但是dataProvider没有刷新内容，我该怎么做？

Answer 1

我实际上并不认为你想要调用Refresh ...或 re - 设置XmlNamespaceManger。我认为对Refresh的调用实际上是告诉XmlDataProvider重新加载它已经拥有的相同源。

更改Source时，应该是触发加载逻辑所需的全部内容。如果您确实想要重新设置XmlNamespaceManager，则应调用DeferRefresh，否则提供程序将在每次更改属性时重新加载。

XmlDataProvider刷新源WPF

1 个答案: