解析由REST为WP7生成的XML
我试图开发一个简单的WP7应用程序来查询生成XML文件的REST源。根据查询,该提要可以生成许多不同的XML文件,但我遇到了最基本的问题。解析由REST为WP7生成的XML
我试图在列表框中显示的XML看起来像;
<subsonic-response status="ok" version="1.1.1">
</subsonic-response>
或
<subsonic-response status="ok" version="1.1.1">
<license valid="true" email="[email protected]" key="ABC123DEF" date="2009-09-03T14:46:43"/>
</subsonic-response>
我已试过从MSDN和其他来源的几个例子,但我似乎无法环绕它我的头。我使用的URL工作原理是因为它在输入浏览器时显示正确的信息,但出于某种原因不会显示在列表框中。
这是我目前使用的代码;
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>
代码当前设计的,所以你可以选择显示的示例XML文件中的任何一个,但没有显示在列表框中在所有。
任何意见,将不胜感激。谢谢。
查看是否存在以下帮助:
string fakeXML = "<subsonic-response status='ok' version='1.1.1'>" +
"<license valid='true' email='[email protected]' " +
" 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;
Bret The Champ :) –
谢谢,我现在正在取得进展,因为ListBox现在显示版本号和状态,但是如果我更改 XDocument doc = XDocument.Parse(fakeXML); 至 XDocument doc = XDocument.Parse(requestString); 我收到以下错误 _XMLException was unhandled_ _根目录下的数据无效。第1行,位置1._ 另外,我将如何显示其他字段?如果我添加代码以显示有效字段(仍然引用fakeXML),我会收到以下错误; _NullReferenceException was unhandled_ _NullReferenceException_ 感谢您的所有帮助! – Revenant
您在XDocument.Parse(requestString)上收到的错误可能意味着在requestString值的开头处有一些无效字符。没有看到价值,我无法提供任何额外的建议。 尝试获取“有效”时的NullReferenceException可能是因为“有效”是“许可证”子元素上的属性。该代码会是这个样子(实际上并没有运行这段代码,自己去查吧): ... 有效= bool.Parse(xe.Element(“许可证”)属性(“有效”) ) ... – BStateham
RestSharp可以用来发出请求,它会反序列化XML和JSON结果。 –