Document XML Parse

Question

Je suis en train d'analyser un document XML à distance (d'Amazon AWS):

<ItemLookupResponse xmlns="http://webservices.amazon.com/AWSECommerceService/2009-03-31"> 
     <OperationRequest> 
     <RequestId>011d32c5-4fab-4c7d-8785-ac48b9bda6da</RequestId> 
     <Arguments> 
      <Argument Name="Condition" Value="New"></Argument> 
      <Argument Name="Operation" Value="ItemLookup"></Argument> 
      <Argument Name="Service" Value="AWSECommerceService"></Argument> 
      <Argument Name="Signature" Value="73l8oLJhITTsWtHxsdrS3BMKsdf01n37PE8u/XCbsJM="></Argument> 
      <Argument Name="MerchantId" Value="Amazon"></Argument> 
      <Argument Name="Version" Value="2009-03-31"></Argument> 
      <Argument Name="ItemId" Value="603084260089"></Argument> 
      <Argument Name="IdType" Value="UPC"></Argument> 
      <Argument Name="AWSAccessKeyId" Value="[myAccessKey]"></Argument> 
      <Argument Name="Timestamp" Value="2010-06-14T15:03:27Z"></Argument> 
      <Argument Name="ResponseGroup" Value="OfferSummary,ItemAttributes"></Argument> 
      <Argument Name="SearchIndex" Value="All"></Argument> 
     </Arguments> 
     <RequestProcessingTime>0.0318510000000000</RequestProcessingTime> 
     </OperationRequest> 
     <Items> 
     <Request> 
      <IsValid>True</IsValid> 
      <ItemLookupRequest> 
      <Condition>New</Condition> 
      <DeliveryMethod>Ship</DeliveryMethod> 
      <IdType>UPC</IdType> 
      <MerchantId>Amazon</MerchantId> 
      <OfferPage>1</OfferPage> 
      <ItemId>603084260089</ItemId> 
      <ResponseGroup>OfferSummary</ResponseGroup> 
      <ResponseGroup>ItemAttributes</ResponseGroup> 
      <ReviewPage>1</ReviewPage> 
      <ReviewSort>-SubmissionDate</ReviewSort> 
      <SearchIndex>All</SearchIndex> 
      <VariationPage>All</VariationPage> 
      </ItemLookupRequest> 
     </Request> 
     <Item> 
      <ASIN>B0000UTUNI</ASIN> 
      <DetailPageURL>http://www.amazon.com/Garnier-Fructis-Fortifying-Conditioner-Minute/dp/B0000UTUNI%3FSubscriptionId%3DAKIAIYPTKHCWTRWWPWBQ%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D165953%26creativeASIN%3DB0000UTUNI</DetailPageURL> 
      <ItemLinks> 
      <ItemLink> 
       <Description>Technical Details</Description> 
       <URL>http://www.amazon.com/Garnier-Fructis-Fortifying-Conditioner-Minute/dp/tech-data/B0000UTUNI%3FSubscriptionId%3DAKIAIYPTKHCWTRWWPWBQ%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D386001%26creativeASIN%3DB0000UTUNI</URL> 
      </ItemLink> 
      <ItemLink> 
       <Description>Add To Baby Registry</Description> 
       <URL>http://www.amazon.com/gp/registry/baby/add-item.html%3Fasin.0%3DB0000UTUNI%26SubscriptionId%3DAKIAIYPTKHCWTRWWPWBQ%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D386001%26creativeASIN%3DB0000UTUNI</URL> 
      </ItemLink> 
      <ItemLink> 
       <Description>Add To Wedding Registry</Description> 
       <URL>http://www.amazon.com/gp/registry/wedding/add-item.html%3Fasin.0%3DB0000UTUNI%26SubscriptionId%3DAKIAIYPTKHCWTRWWPWBQ%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D386001%26creativeASIN%3DB0000UTUNI</URL> 
      </ItemLink> 
      <ItemLink> 
       <Description>Add To Wishlist</Description> 
       <URL>http://www.amazon.com/gp/registry/wishlist/add-item.html%3Fasin.0%3DB0000UTUNI%26SubscriptionId%3DAKIAIYPTKHCWTRWWPWBQ%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D386001%26creativeASIN%3DB0000UTUNI</URL> 
      </ItemLink> 
      <ItemLink> 
       <Description>Tell A Friend</Description> 
       <URL>http://www.amazon.com/gp/pdp/taf/B0000UTUNI%3FSubscriptionId%3DAKIAIYPTKHCWTRWWPWBQ%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D386001%26creativeASIN%3DB0000UTUNI</URL> 
      </ItemLink> 
      <ItemLink> 
       <Description>All Customer Reviews</Description> 
       <URL>http://www.amazon.com/review/product/B0000UTUNI%3FSubscriptionId%3DAKIAIYPTKHCWTRWWPWBQ%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D386001%26creativeASIN%3DB0000UTUNI</URL> 
      </ItemLink> 
      <ItemLink> 
       <Description>All Offers</Description> 
       <URL>http://www.amazon.com/gp/offer-listing/B0000UTUNI%3FSubscriptionId%3DAKIAIYPTKHCWTRWWPWBQ%26tag%3Dws%26linkCode%3Dxm2%26camp%3D2025%26creative%3D386001%26creativeASIN%3DB0000UTUNI</URL> 
      </ItemLink> 
      </ItemLinks> 
      <ItemAttributes> 
      <Binding>Health and Beauty</Binding> 
      <Brand>Garnier</Brand> 
      <EAN>0603084260089</EAN> 
      <Feature>Helps restore strength and shine</Feature> 
      <Feature>Penetrates deep to nourish, repair and rejuvenate</Feature> 
      <Feature>Makes hair softer and more manageable without weighing it down</Feature> 
      <ItemDimensions> 
       <Weight Units="hundredths-pounds">40</Weight> 
      </ItemDimensions> 
      <Label>Garnier</Label> 
      <ListPrice> 
       <Amount>419</Amount> 
       <CurrencyCode>USD</CurrencyCode> 
       <FormattedPrice>$4.19</FormattedPrice> 
      </ListPrice> 
      <Manufacturer>Garnier</Manufacturer> 
      <NumberOfItems>1</NumberOfItems> 
      <ProductGroup>Health and Beauty</ProductGroup> 
      <ProductTypeName>ABIS_DRUGSTORE</ProductTypeName> 
      <Publisher>Garnier</Publisher> 
      <Size>5.0 oz</Size> 
      <Studio>Garnier</Studio> 
      <Title>Garnier Fructis Fortifying Fortifying Deep Conditioner, 3 Minute Masque - 5 oz</Title> 
      <UPC>603084260089</UPC> 
      </ItemAttributes> 
      <OfferSummary> 
      <LowestNewPrice> 
       <Amount>229</Amount> 
       <CurrencyCode>USD</CurrencyCode> 
       <FormattedPrice>$2.29</FormattedPrice> 
      </LowestNewPrice> 
      <TotalNew>7</TotalNew> 
      <TotalUsed>0</TotalUsed> 
      <TotalCollectible>0</TotalCollectible> 
      <TotalRefurbished>0</TotalRefurbished> 
      </OfferSummary> 
     </Item> 
     </Items> 
    </ItemLookupResponse> 

Je suis en train d'extraire des données à partir du flux XML à l'aide XPathDocument, mais pas de chance:

WebRequest request = HttpWebRequest.Create(url); 
     WebResponse response = request.GetResponse(); 
     //XmlDocument doc = new XmlDocument(); 

     XPathDocument Doc = new XPathDocument(response.GetResponseStream()); 
     XPathNavigator nav = Doc.CreateNavigator(); 
     XPathNodeIterator ListPrice = nav.Select("/ItemLookupResponse/Items/Item/ItemAttributes/ListPrice"); 
     foreach (XPathNavigator node in ListPrice) 
     { 
      Response.Write(node.GetAttribute("Amount", NAMESPACE)); 
     } 

Qu'est-ce qui me manque? Merci d'avance!!

EDIT J'utilise .net 3.5

Answer 1

Quelle version du framework .Net vous utilisez? LINQ est-il disponible pour vous? Si c'est le cas, j'utiliserais cela pour retirer les valeurs car c'est un peu plus agréable de travailler avec. Pour un très bel exemple de LINQ un coup d'oeil ici:

http://weblogs.asp.net/scottgu/archive/2007/08/07/using-linq-to-xml-and-how-to-build-a-custom-rss-feed-reader-with-it.aspx

Answer 2

Montant n'est pas un attribut, il est un élément enfant. La requête xpath correspondante est /ItemLookupResponse/Items/Item/ItemAttributes/ListPrice/Amount.

XPathNodeIterator ListPrice = nav.Select("/ItemLookupResponse/Items/Item/ItemAttributes/ListPrice/Amount"); 

Response.Write(ListPrice.Value); 

Answer 3

Vous ne prêtez pas attention à l'espace de noms XML (s) dans le document XML (et ne sont les autres réponses fournies):

<ItemLookupResponse 
    xmlns="http://webservices.amazon.com/AWSECommerceService/2009-03-31"> 

Vous devez en tenir compte!

XPathDocument Doc = new XPathDocument(@"D:\amazon.xml"); 

XPathNavigator nav = Doc.CreateNavigator(); 

// add a XML namespace manager - pick any prefix you want   
XmlNamespaceManager mngr = new XmlNamespaceManager(nav.NameTable); 
mngr.AddNamespace("az", "http://webservices.amazon.com/AWSECommerceService/2009-03-31"); 

// use that XML namespace prefix to select 
var ListPrice = nav.Select("/az:ItemLookupResponse/az:Items/az:Item/az:ItemAttributes/az:ListPrice", mngr); 

MISE À JOUR: si vous voulez explorer les nœuds enfants en dessous de votre noeud ListPrice, vous pouvez faire quelque chose comme ceci:

var curr = ListPrice.Current; 

if(ListPrice.MoveNext()) 
{ 
    var lpc = ListPrice.Current; 

    if(lpc.MoveToFirstChild()) 
    { 
     var node = lpc.Name + "/" + lpc.Value; 

     while(lpc.MoveToNext()) 
     { 
      node = lpc.Name + "/" + lpc.Value; 
     } 
    } 
} 

à itérer tous les nœuds enfants sous <ListPrice> et d'obtenir leur nom et la valeur.