C＃Linq XML API

私はWP7アプリケーション用の数式1 APIを使用しようとしています。私は正しいノードと要素を選択する正しい方法を見つけることができません。正しい方法は何ですか？これはXMLです：ergast.com/api/f1/2012/driversC＃Linq XML API

DriversPage.xaml.cs

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 Formule1 
{ 
public partial class DriversPage : PhoneApplicationPage 
{ 
    const string URL = "http://ergast.com/api/f1/2012/"; 

    public DriversPage() 
    { 
     InitializeComponent(); 
     GetDrivers(); 
    } 

    private void GetDrivers() 
    { 
     string resource = "drivers";    
     WebClient webclient = new WebClient();   
     webclient.DownloadStringCompleted += new  DownloadStringCompletedEventHandler(webclient_DownloadStringCompleted);   
     webclient.DownloadStringAsync(new Uri(URL + resource)); 
    } 

    private void webclient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
    { 
     if (e.Error != null) 
     { 
      return; 
     } 
     // xml-resultaat parsen 
     XDocument xmlEntries = XDocument.Parse(e.Result);      

     List<Driver> drivers = new List<Driver>(); 

      drivers = (from element in xmlEntries.Root.Element("DriverTable").Descendants("Driver") 
         select new Driver(element.Attribute("driverId").Value)).ToList<Driver>(); 

      DriverListBox.ItemsSource = drivers; 

    } 
    } 
}

API

<?xml version="1.0" encoding="utf-8"?> 
<?xml-stylesheet type="text/xsl" href="http://ergast.com/schemas/mrd-1.2.xsl"?> 
<MRData xmlns="http://ergast.com/mrd/1.2" series="f1" url="http://ergast.com/api/f1/2012/drivers" limit="30" offset="0" total="24"> 
     <DriverTable season="2012"> 
       <Driver driverId="alonso" url="http://en.wikipedia.org/wiki/Fernando_Alonso"> 
         <GivenName>Fernando</GivenName> 
         <FamilyName>Alonso</FamilyName> 
         <DateOfBirth>1981-07-29</DateOfBirth> 
         <Nationality>Spanish</Nationality> 
       </Driver> 
       <Driver driverId="button" url="http://en.wikipedia.org/wiki/Jenson_Button"> 
         <GivenName>Jenson</GivenName> 
         <FamilyName>Button</FamilyName> 
         <DateOfBirth>1980-01-19</DateOfBirth> 
         <Nationality>British</Nationality> 
       </Driver> 
       <Driver driverId="rosa" url="http://en.wikipedia.org/wiki/Pedro_de_la_Rosa"> 
         <GivenName>Pedro</GivenName> 
         <FamilyName>de la Rosa</FamilyName> 
         <DateOfBirth>1971-02-24</DateOfBirth> 
         <Nationality>Spanish</Nationality> 
       </Driver> 
       <Driver driverId="resta" url="http://en.wikipedia.org/wiki/Paul_di_Resta"> 
         <GivenName>Paul</GivenName> 
         <FamilyName>di Resta</FamilyName> 
         <DateOfBirth>1986-04-16</DateOfBirth> 
         <Nationality>Scottish</Nationality> 
       </Driver> 
       <Driver driverId="glock" url="http://en.wikipedia.org/wiki/Timo_Glock"> 
         <GivenName>Timo</GivenName> 
         <FamilyName>Glock</FamilyName> 
         <DateOfBirth>1982-03-18</DateOfBirth> 
         <Nationality>German</Nationality> 
       </Driver> 
       <Driver driverId="grosjean" url="http://en.wikipedia.org/wiki/Romain_Grosjean"> 
         <GivenName>Romain</GivenName> 
         <FamilyName>Grosjean</FamilyName> 
         <DateOfBirth>1986-04-17</DateOfBirth> 
         <Nationality>French</Nationality> 
       </Driver> 
       <Driver driverId="hamilton" url="http://en.wikipedia.org/wiki/Lewis_Hamilton"> 
         <GivenName>Lewis</GivenName> 
         <FamilyName>Hamilton</FamilyName> 
         <DateOfBirth>1985-01-07</DateOfBirth> 
         <Nationality>British</Nationality> 
       </Driver> 
       <Driver driverId="hulkenberg" url="http://en.wikipedia.org/wiki/Nico_H%C3%BClkenberg"> 
         <GivenName>Nico</GivenName> 
         <FamilyName>Hülkenberg</FamilyName> 
         <DateOfBirth>1987-08-19</DateOfBirth> 
         <Nationality>German</Nationality> 
       </Driver> 
       <Driver driverId="karthikeyan" url="http://en.wikipedia.org/wiki/Narain_Karthikeyan"> 
         <GivenName>Narain</GivenName> 
         <FamilyName>Karthikeyan</FamilyName> 
         <DateOfBirth>1977-01-14</DateOfBirth> 
         <Nationality>Indian</Nationality> 
       </Driver> 
       <Driver driverId="kobayashi" url="http://en.wikipedia.org/wiki/Kamui_Kobayashi"> 
         <GivenName>Kamui</GivenName> 
         <FamilyName>Kobayashi</FamilyName> 
         <DateOfBirth>1986-09-13</DateOfBirth> 
         <Nationality>Japanese</Nationality> 
       </Driver> 
       <Driver driverId="kovalainen" url="http://en.wikipedia.org/wiki/Heikki_Kovalainen"> 
         <GivenName>Heikki</GivenName> 
         <FamilyName>Kovalainen</FamilyName> 
         <DateOfBirth>1981-10-19</DateOfBirth> 
         <Nationality>Finnish</Nationality> 
       </Driver> 
       <Driver driverId="maldonado" url="http://en.wikipedia.org/wiki/Pastor_Maldonado"> 
         <GivenName>Pastor</GivenName> 
         <FamilyName>Maldonado</FamilyName> 
         <DateOfBirth>1985-03-09</DateOfBirth> 
         <Nationality>Venezuelan</Nationality> 
       </Driver> 
       <Driver driverId="massa" url="http://en.wikipedia.org/wiki/Felipe_Massa"> 
         <GivenName>Felipe</GivenName> 
         <FamilyName>Massa</FamilyName> 
         <DateOfBirth>1981-04-25</DateOfBirth> 
         <Nationality>Brazilian</Nationality> 
       </Driver> 
       <Driver driverId="perez" url="http://en.wikipedia.org/wiki/Sergio_P%C3%A9rez"> 
         <GivenName>Sergio</GivenName> 
         <FamilyName>Pérez</FamilyName> 
         <DateOfBirth>1990-01-26</DateOfBirth> 
         <Nationality>Mexican</Nationality> 
       </Driver> 
       <Driver driverId="petrov" url="http://en.wikipedia.org/wiki/Vitaly_Petrov"> 
         <GivenName>Vitaly</GivenName> 
         <FamilyName>Petrov</FamilyName> 
         <DateOfBirth>1984-09-08</DateOfBirth> 
         <Nationality>Russian</Nationality> 
       </Driver> 
       <Driver driverId="pic" url="http://en.wikipedia.org/wiki/Charles_Pic"> 
         <GivenName>Charles</GivenName> 
         <FamilyName>Pic</FamilyName> 
         <DateOfBirth>1990-02-15</DateOfBirth> 
         <Nationality>French</Nationality> 
       </Driver> 
       <Driver driverId="raikkonen" url="http://en.wikipedia.org/wiki/Kimi_R%C3%A4ikk%C3%B6nen"> 
         <GivenName>Kimi</GivenName> 
         <FamilyName>Räikkönen</FamilyName> 
         <DateOfBirth>1979-10-17</DateOfBirth> 
         <Nationality>Finnish</Nationality> 
       </Driver> 
       <Driver driverId="ricciardo" url="http://en.wikipedia.org/wiki/Daniel_Ricciardo"> 
         <GivenName>Daniel</GivenName> 
         <FamilyName>Ricciardo</FamilyName> 
         <DateOfBirth>1989-07-01</DateOfBirth> 
         <Nationality>Australian</Nationality> 
       </Driver> 
       <Driver driverId="rosberg" url="http://en.wikipedia.org/wiki/Nico_Rosberg"> 
         <GivenName>Nico</GivenName> 
         <FamilyName>Rosberg</FamilyName> 
         <DateOfBirth>1985-06-27</DateOfBirth> 
         <Nationality>German</Nationality> 
       </Driver> 
       <Driver driverId="michael_schumacher" url="http://en.wikipedia.org/wiki/Michael_Schumacher"> 
         <GivenName>Michael</GivenName> 
         <FamilyName>Schumacher</FamilyName> 
         <DateOfBirth>1969-01-03</DateOfBirth> 
         <Nationality>German</Nationality> 
       </Driver> 
       <Driver driverId="bruno_senna" url="http://en.wikipedia.org/wiki/Bruno_Senna"> 
         <GivenName>Bruno</GivenName> 
         <FamilyName>Senna</FamilyName> 
         <DateOfBirth>1983-10-15</DateOfBirth> 
         <Nationality>Brazilian</Nationality> 
       </Driver> 
       <Driver driverId="vergne" url="http://en.wikipedia.org/wiki/Jean-%C3%89ric_Vergne"> 
         <GivenName>Jean-Éric</GivenName> 
         <FamilyName>Vergne</FamilyName> 
         <DateOfBirth>1990-04-25</DateOfBirth> 
         <Nationality>French</Nationality> 
       </Driver> 
       <Driver driverId="vettel" url="http://en.wikipedia.org/wiki/Sebastian_Vettel"> 
         <GivenName>Sebastian</GivenName> 
         <FamilyName>Vettel</FamilyName> 
         <DateOfBirth>1987-07-03</DateOfBirth> 
         <Nationality>German</Nationality> 
       </Driver> 
       <Driver driverId="webber" url="http://en.wikipedia.org/wiki/Mark_Webber"> 
         <GivenName>Mark</GivenName> 
         <FamilyName>Webber</FamilyName> 
         <DateOfBirth>1976-08-27</DateOfBirth> 
         <Nationality>Australian</Nationality> 
       </Driver> 
     </DriverTable> 
</MRData>

出典

2012-05-10 Spider

あなたのエラーは何をしようと？ – Tejs

nullrefference例外が発生する – Spider

は、私は、その名前空間が原因だと思います問題。または名前空間に：

drivers = (from element in xmlEntries.Descendants() 
      where element.Name.LocalName == "Driver" 
      select new Driver(element.Attribute("driverId").Value)).ToList<Driver>();

編集：あなたはこのようにそれを試すことができます

var ns = xmlEntries.Root.Name.Namespace; 
drivers = (from element in xmlEntries.Root.Element(ns + "DriverTable").Descendants(ns + "Driver") 
      select new Driver(element.Attribute("driverId").Value)).ToList<Driver>();

出典

2012-05-10 17:13:02 Umair

ありがとうございました。それはとてもうまくいく。 – Spider

それは属性では機能しましたが、要素では機能しませんでした。 – Spider

Name.Namespaceについて私は知らなかった。それは私の以前のプロジェクトからハードコーディングされたジャンクをたくさん削除してしまいました！クール –

この

private void webclient_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
    { 
     if (e.Error != null) 
     { 
      return; 
     }   
     XDocument xmlEntries = XDocument.Parse(e.Result); 
     IEnumerable<Driver> list = from item in feed.Descendants("channel").Elements("Driver") 
             select new Driver 
             { 
              Name = (string)item.Attribute("driverId")            
             }; 
     ObservableCollection<Driver>() collection = new ObservableCollection<Driver>(); 
     foreach (Driver d in list) 
     { 
      collection.Add(d); 
     } 

     DriverListBox.ItemsSource = collection; 
    }

出典

2012-05-10 20:27:19

答えて

関連する問題