解析由REST爲WP7生成的XML

Question

我試圖開發一個簡單的WP7應用程序來查詢生成XML文件的REST源。根據查詢，該提要可以生成許多不同的XML文件，但我遇到了最基本的問題。

我試圖在列表框中顯示的XML看起來像;

<subsonic-response status="ok" version="1.1.1"> 
</subsonic-response> 

或

<subsonic-response status="ok" version="1.1.1"> 
<license valid="true" email="foo@bar.com" key="ABC123DEF" date="2009-09-03T14:46:43"/> 
</subsonic-response> 

我已試過從MSDN和其他來源的幾個例子，但我似乎無法環繞它我的頭。我使用的URL工作原理是因爲它在輸入瀏覽器時顯示正確的信息，但出於某種原因不會顯示在列表框中。

這是我目前使用的代碼;

C＃

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Documents; 
using System.Windows.Input; 
using System.Windows.Media; 
using System.Windows.Media.Animation; 
using System.Windows.Shapes; 
using Microsoft.Phone.Controls; 
using System.Xml.Linq; 

namespace RESTTest 
{ 
public partial class MainPage : PhoneApplicationPage 
{ 
    // Constructor 
    string requestString = 
    "http://WEBSITE/rest/{0}.view?u=USERNAME&p=PASSWORD&v=1.8.0&c=RestTest"; 
    string UriNoAppId = 
    "http://WEBSITE/rest/{0}.view?u=USERNAME&p=PASSWORD&v=1.8.0&c=RestTest"; 
    public MainPage() 
    { 
     InitializeComponent(); 
     List<string> searchTopics = new List<string>() { "ping", "getLicense" }; 
     comboBox1.DataContext = searchTopics; 
     comboBox1.SelectedIndex = 0; 
     // Create the WebClient and associate a handler with the OpenReadCompleted event. 
     wc = new WebClient(); 
     wc.OpenReadCompleted += new OpenReadCompletedEventHandler(wc_OpenReadCompleted); 
    } 
    // Call the topic service at the Bing search site. 
    WebClient wc; 
    private void CallToWebService() 
    { 
     // Call the OpenReadAsyc to make a get request, passing the url with the selected search string. 
     wc.OpenReadAsync(new Uri(String.Format(requestString, comboBox1.SelectedItem.ToString()))); 
    } 
    void wc_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e) 
    { 
     XElement resultXml; 
     // You should always check to see if an error occurred. In this case, the application 
     // simply returns. 
     if (e.Error != null) 
     { 
      return; 
     } 
     else 
     { 
      XNamespace web = "http://subsonic.org/restapi"; 
      try 
      { 
       resultXml = XElement.Load(e.Result); 
       // Search for the WebResult node and create a SearchResults object for each one. 
       var searchResults = 
       from result in resultXml.Descendants(web + "WebResult") 
       select new SearchResult 
       { 
        // Get the Title, Description and Url values. 
        Title = result.Element(web + "version").Value, 
        Url = result.Element(web + "status").Value 
       }; 
       // Set the data context for the listbox to the results. 
       listBox1.DataContext = searchResults; 
       textBox1.DataContext = searchResults; 
      } 
      catch (System.Xml.XmlException ex) 
      { 
       textBlock2.Text = ex.Message; 
      } 
     } 
    } 
    private void button1_Click(object sender, RoutedEventArgs e) 
    { 
     CallToWebService(); 
    } 
    // Update the textblock as the combo box selection changes. 
    private void comboBox1_SelectionChanged(object sender, SelectionChangedEventArgs e) 
    { 
     uriTextBlock.DataContext = string.Format(UriNoAppId, e.AddedItems[0]); 
    } 

} 
// Simple class to hold the search results. 
public class SearchResult 
{ 
    public string Title { get; set; } 
    public string Url { get; set; } 
} 
} 

XAML

<phone:PhoneApplicationPage 
x:Class="RESTTest.MainPage" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" 
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" 
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="800" 
FontFamily="{StaticResource PhoneFontFamilyNormal}" 
FontSize="{StaticResource PhoneFontSizeNormal}" 
Foreground="{StaticResource PhoneForegroundBrush}" 
SupportedOrientations="Portrait" Orientation="Portrait" 
shell:SystemTray.IsVisible="False"> 
<!--LayoutRoot is the root grid where all page content is placed--> 
<Grid x:Name="LayoutRoot" Background="Transparent"> 
    <Grid.Resources> 
     <Style x:Key="ComboBoxItemStyle" TargetType="ComboBoxItem" > 
      <Setter Property="Foreground" Value="Black"/> 
      <Setter Property="Background" Value="LightGray"/> 
     </Style> 
     <Style x:Key="ComboBoxStyle" TargetType="ComboBox" > 
      <Setter Property="Foreground" Value="Black"/> 
      <Setter Property="Background" Value="Gray"/> 
     </Style> 
    </Grid.Resources> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="Auto"/> 
     <RowDefinition Height="*"/> 
    </Grid.RowDefinitions> 
    <!--TitlePanel contains the name of the application and page title--> 
    <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28"> 
     <TextBlock x:Name="ApplicationTitle" Text="REST CLIENT" 
        Style="{StaticResource PhoneTextNormalStyle}"/> 
     <TextBlock x:Name="PageTitle" Text="Subsonic" 
        Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}" 
        Height="99" Width="453" /> 
    </StackPanel> 
    <!--ContentPanel - place additional content here--> 
    <Grid x:Name="ContentPanel" Margin="12,139,12,0" Grid.RowSpan="2"> 
     <Button Content="Search!" Height="89" HorizontalAlignment="Left" 
       Margin="264,140,0,0" Name="button1" 
       VerticalAlignment="Top" Width="189" Click="button1_Click" /> 
     <ComboBox Height="50" Style="{StaticResource ComboBoxStyle}" 
        HorizontalAlignment="Left" Margin="6,159" Name="comboBox1" 
        ItemContainerStyle="{StaticResource ComboBoxItemStyle}" 
        VerticalAlignment="Top" Width="235" ItemsSource="{Binding}" 
        SelectionChanged="comboBox1_SelectionChanged" /> 
     <TextBlock Height="36" HorizontalAlignment="Left" Margin="12,120" 
        Name="textBlock2" Text="Search Topic:" VerticalAlignment="Top" width="121" /> 
     <TextBlock Height="23" HorizontalAlignment="Left" Margin="12,1,0,0" 
        Name="textBlock3" 
        Text="URI:" VerticalAlignment="Top" /> 
     <TextBlock Height="86" HorizontalAlignment="Left" Margin="6,28" 
        Name="uriTextBlock" TextWrapping="Wrap" Text="{Binding}" 
        VerticalAlignment="Top" Width="447" /> 
     <TextBlock Height="23" HorizontalAlignment="Left" Margin="12,242,0,0" 
        Name="textBlock5" 
        Text="Results:" VerticalAlignment="Top" /> 
     <ListBox Height="169" HorizontalAlignment="Left" Margin="6,271,0,0" Name="listBox1" 
       VerticalAlignment="Top" Width="444" ItemsSource="{Binding}"> 
      <ListBox.ItemTemplate> 
       <DataTemplate> 
        <Border BorderBrush="{StaticResource PhoneForegroundBrush}" Width="418" 
          BorderThickness="2" Margin="2"> 
         <StackPanel> 
          <TextBlock Text="{Binding Path=Title}" TextWrapping="Wrap" /> 
          <TextBlock Text="{Binding Path=Url}" TextWrapping="Wrap"/> 
         </StackPanel> 
        </Border> 
       </DataTemplate> 
      </ListBox.ItemTemplate> 
     </ListBox> 
     <TextBox Height="209" HorizontalAlignment="Left" Margin="6,446,0,0" Name="textBox1" Text="" VerticalAlignment="Top" Width="444" IsEnabled="True" IsReadOnly="True" /> 
    </Grid> 
</Grid> 
</phone:PhoneApplicationPage> 

代碼當前設計的，所以你可以選擇顯示的示例XML文件中的任何一個，但沒有顯示在列表框中在所有。

任何意見，將不勝感激。謝謝。

Answer 1

查看是否存在以下幫助：

string fakeXML = "<subsonic-response status='ok' version='1.1.1'>" + 
       "<license valid='true' email='foo@bar.com' " + 
       " key='ABC123DEF' date='2009-09-03T14:46:43'/>" + 
       "</subsonic-response>"; 
XDocument doc = XDocument.Parse(fakeXML); 

var searchResults = from xe in doc.Elements("subsonic-response") 
        select new SearchResult 
        { 
         Title = xe.Attribute("version").Value, 
         Url = xe.Attribute("status").Value 
        }; 
listBox1.DataContext = searchResults; 
textBox1.DataContext = searchResults;