如何仅处理某些XML节点？ [英] How do process only certain XML nodes?
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问题描述
这是我的XML片段（它有一个根元素）。
This is my XML snippet (it has a root element).
<ItemAttributes>
<Author>Ellen Galinsky</Author>
<Binding>Paperback</Binding>
<Brand>Harper Paperbacks</Brand>
<EAN>9780061732324</EAN>
<EANList>
<EANListElement>9780061732324</EANListElement>
</EANList>
<Edition>1</Edition>
<Feature>ISBN13: 9780061732324</Feature>
<Feature>Condition: New</Feature>
<Feature>Notes: BRAND NEW FROM PUBLISHER! 100% Satisfaction Guarantee. Tracking provided on most orders. Buy with Confidence! Millions of books sold!</Feature>
<ISBN>006173232X</ISBN>
<IsEligibleForTradeIn>1</IsEligibleForTradeIn>
<ItemDimensions>
<Height Units="hundredths-inches">112</Height>
<Length Units="hundredths-inches">904</Length>
<Weight Units="hundredths-pounds">98</Weight>
<Width Units="hundredths-inches">602</Width>
</ItemDimensions>
<Label>William Morrow Paperbacks</Label>
<ListPrice>
<Amount>1699</Amount>
<CurrencyCode>USD</CurrencyCode>
<FormattedPrice>$16.99</FormattedPrice>
</ListPrice>
<Manufacturer>William Morrow Paperbacks</Manufacturer>
<MPN>006173232X</MPN>
<NumberOfItems>1</NumberOfItems>
<NumberOfPages>400</NumberOfPages>
<PackageDimensions>
<Height Units="hundredths-inches">120</Height>
<Length Units="hundredths-inches">880</Length>
<Weight Units="hundredths-pounds">95</Weight>
<Width Units="hundredths-inches">590</Width>
</PackageDimensions>
<PartNumber>006173232X</PartNumber>
<ProductGroup>Book</ProductGroup>
<ProductTypeName>ABIS_BOOK</ProductTypeName>
<PublicationDate>2010-04-20</PublicationDate>
<Publisher>William Morrow Paperbacks</Publisher>
<ReleaseDate>2010-04-20</ReleaseDate>
<SKU>mon0000013657</SKU>
<Studio>William Morrow Paperbacks</Studio>
<Title>Mind in the Making: The Seven Essential Life Skills Every Child Needs</Title>
</ItemAttributes>
有多个ItemAttributes中节点，每个具有不同的ProductGroup节点。我想只有第一ItemAttribute，其中ProductGroup=的书：
There are multiple "ItemAttributes" nodes, each having a different "ProductGroup" node. I want only the first "ItemAttribute" where "ProductGroup" = "book:"
这是我的C＃代码：
XPathDocument doc = new XPathDocument(sr);
XPathNavigator nav = doc.CreateNavigator();
// Compile a standard XPath expression
XPathExpression expr;
expr = nav.Compile("//ItemAttributes[contains(ProductGroup, 'Book')]");
XPathNodeIterator iterator = nav.Select(expr);
// Iterate on the node set
try {
int x = iterator.Count; // <----------- count = 0
while (iterator.MoveNext()) { // <----------- finds nothing!
XPathNavigator nav2 = iterator.Current.Clone();
listBox1.Items.Add("price: " + nav2.Value);
}
}
catch (Exception ex) {
Console.WriteLine(ex.Message);
}
我知道我的代码是不正确的，但我不明白为什么该iterator.Count为零！
I know my code isn't correct, but I don't understand why the iterator.Count is zero!
推荐答案
使用 System.Xml.Linq的
XDocument xdoc = XDocument.Load(new StringReader(xmlstr));
var foundNode = xdoc
.Descendants("ItemAttributes")
.Where(node => node.Element("ProductGroup").Value == "Book")
.First();
var price = foundNode.Element("ListPrice").Element("FormattedPrice").Value;
- 编辑 -
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Linq;
using System.IO;
namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
string xmlstr = @"
<root>
<ItemAttributes>
<Author>Ellen Galinsky</Author>
<Binding>Paperback</Binding>
<Brand>Harper Paperbacks</Brand>
<EAN>9780061732324</EAN>
<EANList>
<EANListElement>9780061732324</EANListElement>
</EANList><Edition>1</Edition>
<Feature>ISBN13: 9780061732324</Feature>
<Feature>Condition: New</Feature>
<Feature>Notes: BRAND NEW FROM PUBLISHER! 100% Satisfaction Guarantee. Tracking provided on most orders. Buy with Confidence! Millions of books sold!</Feature>
<ISBN>006173232X</ISBN>
<IsEligibleForTradeIn>1</IsEligibleForTradeIn>
<ItemDimensions>
<Height Units=""hundredths-inches"">112</Height>
<Length Units=""hundredths-inches"">904</Length>
<Weight Units=""hundredths-pounds"">98</Weight>
<Width Units=""hundredths-inches"">602</Width>
</ItemDimensions>
<Label>William Morrow Paperbacks</Label>
<ListPrice>
<Amount>1699</Amount>
<CurrencyCode>USD</CurrencyCode>
<FormattedPrice>$16.99</FormattedPrice>
</ListPrice>
<Manufacturer>William Morrow Paperbacks</Manufacturer>
<MPN>006173232X</MPN>
<NumberOfItems>1</NumberOfItems>
<NumberOfPages>400</NumberOfPages>
<PackageDimensions>
<Height Units=""hundredths-inches"">120</Height>
<Length Units=""hundredths-inches"">880</Length>
<Weight Units=""hundredths-pounds"">95</Weight>
<Width Units=""hundredths-inches"">590</Width>
</PackageDimensions>
<PartNumber>006173232X</PartNumber>
<ProductGroup>Book</ProductGroup>
<ProductTypeName>ABIS_BOOK</ProductTypeName>
<PublicationDate>2010-04-20</PublicationDate>
<Publisher>William Morrow Paperbacks</Publisher>
<ReleaseDate>2010-04-20</ReleaseDate>
<SKU>mon0000013657</SKU>
<Studio>William Morrow Paperbacks</Studio>
<Title>Mind in the Making: The Seven Essential Life Skills Every Child Needs</Title>
</ItemAttributes>
</root>
";
XDocument xdoc = XDocument.Load(new StringReader(xmlstr));
var foundNode = xdoc
.Descendants("ItemAttributes")
.Where(node => node.Element("ProductGroup").Value == "Book")
.First();
Console.WriteLine(foundNode.Element("ListPrice").Element("FormattedPrice").Value);
Console.ReadLine();
}
}
}
- EDIT2 -
XDocument xdoc = XDocument.Load("http://ecs.amazonaws.com/onca/xml?AWSAccessKeyId=AKIAIAAFYAPOR6SX5GOA&AssociateTag=pragbook-20&IdType=ISBN&ItemId=9780061732324&MerchantId=All&Operation=ItemLookup&ResponseGroup=Medium&SearchIndex=Books&Service=AWSECommerceService&Timestamp=2012-02-26T20%3A18%3A37Z&Version=2011-08-01&Signature=r7yE7BQI44CqWZAiK%2FWumF3N4iutOj3re9wZtESOaKs%3D");
XNamespace ns = XNamespace.Get("http://webservices.amazon.com/AWSECommerceService/2011-08-01");
var foundNode = xdoc
.Descendants(ns+"ItemAttributes")
.Where(node => node.Element(ns+"ProductGroup").Value == "Book")
.First();
Console.WriteLine(foundNode.Element(ns+"ListPrice").Element(ns+"FormattedPrice").Value);
Console.ReadLine();
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