LINQ to XML - 沒有任何約束力？

Question

我試圖從XML解析，但由於某種原因，我沒有在我的文本框中被disaplyed，我有變量綁定。

我喜歡嘗試各種各樣的變化sof Xdocuemnt或Xelement，但它似乎並沒有工作。 XML結構看起來相當簡單，所以我無法弄清楚發生了什麼問題。

任何幫助，將不勝感激。

編輯* * ** * ** * ****

現在，所有的工作。感謝您的幫助。

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 TradeMe 
{ 
    public partial class MainPage : PhoneApplicationPage 
    { 
     // Constructor 
     public MainPage() 
     { 
      InitializeComponent(); 
     } 

     private void button1_Click(object sender, RoutedEventArgs e) 
     { 
      WebClient Trademe = new WebClient(); 
      Trademe.DownloadStringCompleted += new DownloadStringCompletedEventHandler(Trademe_DownloadStringCompleted); 
      Trademe.DownloadStringAsync(new Uri ("http://api.trademe.co.nz/v1/Search/General.xml?search_string=" + TradeSearch.Text)); 
     } 

     void Trademe_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e) 
     { 
      if (e.Error != null) 
       return; 

      var r = XDocument.Parse(e.Result); 

      // Declare the namespace 
      XNamespace ns = "http://api.trademe.co.nz/v1"; 
      listBox1.ItemsSource = from TM in r.Root.Descendants(ns + "Listing") 
            select new TradeItem 
            { 
             //ImageSource = TM.Element(ns + "Listing").Element(ns + "PictureHref").Value, 
             Message = TM.Element(ns + "Title").Value, 
             UserName = TM.Element(ns + "Region").Value 
            }; 
     } 

     public class TradeItem 
     { 
      public string UserName { get; set; } 
      public string Message { get; set; } 
      public string ImageSource { get; set; } 
     } 




    } 
} 

XML看起來像這樣。

<SearchResults xmlns="http://api.trademe.co.nz/v1" xmlns:i="http://www.w3.org/2001/XMLSchema-instance"> 
    <TotalCount>12723</TotalCount> 
    <Page>1</Page> 
    <PageSize>50</PageSize> 
- <List> 
- <Listing> 
    <ListingId>399739762</ListingId> 
    <Title>Playstation 3 320GB Slim going at $1 Reserve</Title> 
    <Category>0202-6205-6207-</Category> 
    <StartPrice>1.0000</StartPrice> 
    <StartDate>2011-08-14T22:52:28.833Z</StartDate> 
    <EndDate>2011-08-21T08:45:00Z</EndDate> 
    <ListingLength i:nil="true" /> 
    <HasGallery>true</HasGallery> 
    <MaxBidAmount>400.0000</MaxBidAmount> 
    <AsAt>2011-08-18T19:33:41.4561556Z</AsAt> 
    <CategoryPath>/Gaming/PlayStation-3/Consoles</CategoryPath> 
    <PictureHref>http://images.trademe.co.nz/photoserver/thumb/27/183787627.jpg</PictureHref> 
    <RegionId>2</RegionId> 
    <Region>Auckland</Region> 
    <BidCount>137</BidCount> 
    <IsReserveMet>true</IsReserveMet> 
    <HasReserve>true</HasReserve> 
    <NoteDate>1970-01-01T00:00:00Z</NoteDate> 
    <ReserveState>Met</ReserveState> 
    <PriceDisplay>$400.00</PriceDisplay> 
    </Listing> 

Answer 1

試試這個：

 // Declare the namespace 
     XNamespace ns = "http://api.trademe.co.nz/v1"; 
     listBox1.ItemsSource = from TM in r.Root.Descendants(ns+"List") 
           select new TradeItem 
           {          
            ImageSource = TM.Element(ns+"Listing") 
            .Element(ns+"PictureHref").Value, 
            Message = TM.Element(ns+"PageSize").Value, 
            UserName = TM.Element(ns+"SearchResults").Element(ns+"Page").Value 
           }; 

Answer 2

沒有匹配，因爲您沒有指定名稱空間。見the sample code at MSDN，在這裏重複：

XElement root = XElement.Parse(
@"<Root xmlns='http://www.adventure-works.com'> 
    <Child>1</Child> 
    <Child>2</Child> 
    <Child>3</Child> 
    <AnotherChild>4</AnotherChild> 
    <AnotherChild>5</AnotherChild> 
    <AnotherChild>6</AnotherChild> 
</Root>"); 
XNamespace aw = "http://www.adventure-works.com"; 
IEnumerable<XElement> c1 = 
    from el in root.Elements(aw + "Child") 
    select el; 
Console.WriteLine("Result set follows:"); 
foreach (XElement el in c1) 
    Console.WriteLine((int)el); 
Console.WriteLine("End of result set");