Question

我将解析后的字符串传递给按钮点击事件时出现问题。它在这个线程here中得到了解决，但是现在又出现了一个小问题，但它与LINQ TO XML有关。我正在制作一个页面，它将显示我制作的所有应用程序，并将使用XML进行更新，我将在我的服务器上托管。在那个页面上，我正在解析应用程序的图标，标题，价格和市场Uri。我将Uri和应用程序的标题绑定到单个超链接按钮，但问题是列表上的每个超链接按钮都会将我带到同一个市场页面。如何修复它，以便每个超链接按钮导航到不同的页面？

以下是代码：

  public partial class MorePage : PhoneApplicationPage
{
    private string appLink;

    public MorePage()
    {
        InitializeComponent();
    }

    protected override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
    {
        WebClient client = new WebClient();
        Uri uritoXML = new Uri("http://www.allanhaapalainen.com/AppsXML/MorePageXML.xml", UriKind.RelativeOrAbsolute);
        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
        client.DownloadStringAsync(uritoXML);

        base.OnNavigatedTo(e);
    }

 public void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
    {
        XDocument moreApps = XDocument.Parse(e.Result);

        morePageAppList.ItemsSource = from Apps in moreApps.Descendants("App")
                                       select new MoreApps
                                       {
                                           MoreImage = Apps.Element("link").Value,
                                           Price = Apps.Element("price").Value,
                                           Title = Apps.Element("title").Value
                                       };

        var attribute = (from Apps in moreApps.Descendants("App")
                         select new MoreApps
                         {
                             AppAttribute = (string)Apps.Attribute("id").Value
                         }).FirstOrDefault();


        string appAttr = attribute.AppAttribute;

        var link = (from Apps in moreApps.Descendants("App")
                    where Apps.Attribute("id").Value == appAttr
                    select new MoreApps
                    {
                        AppUri = (string)Apps.Element("marketplace").Value
                    }).FirstOrDefault();

        appLink = link.AppUri;            
    }

    private void App_Name_Click(object sender, RoutedEventArgs e)
    {
        ShowMarket(appLink);
    }

    private void ShowMarket(string id)
    {
        MarketplaceDetailTask marketplaceDetailTask = new MarketplaceDetailTask();
        marketplaceDetailTask.ContentIdentifier = id;
        marketplaceDetailTask.Show();
    }

}

和XAML：

<ListBox Height="500" Width="Auto" Name="morePageAppList" Margin="0,0,0,0" ItemsSource="{Binding}">
            <ListBox.ItemTemplate>
                <DataTemplate>
                        <StackPanel Orientation="Horizontal" Height="173">
                            <Image Source="{Binding MoreImage}" Height="Auto" Width="Auto" />
                                <StackPanel Orientation="Vertical">
                                     <HyperlinkButton Name="appName" Content="{Binding Title}" Margin="15,60,0,0"  Click="App_Name_Click" />
                                     <TextBlock Name="price" Text="{Binding Price}" Margin="28,0,0,0" Foreground="#FFBD0000" />
                                </StackPanel>
                        </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>

Answer 1

就像我在上一篇文章中提到的那样，您可以使用tag参数。更新您的DataTemplate

<DataTemplate>
                        <StackPanel Orientation="Horizontal" Height="173">
                            <Image Source="{Binding MoreImage}" Height="Auto" Width="Auto" />
                                <StackPanel Orientation="Vertical">
                                     <HyperlinkButton Name="appName" Content="{Binding Title}" Tag="{Binding}" Margin="15,60,0,0"  Click="App_Name_Click" />
                                     <TextBlock Name="price" Text="{Binding Price}" Margin="28,0,0,0" Foreground="#FFBD0000" />
                                </StackPanel>
                        </StackPanel>
                </DataTemplate>

然后在您的活动中

private void App_Name_Click(object sender, RoutedEventArgs e)
    {
        var button = (HyperLinkButton)sender;
        var selectedApp = (MoreApps)button.Tag;

        ShowMarket(selectedApp.AppUri);
    }

LINQ to XML将多个Uri解析为单个超链接按钮

1 个答案: