xml解析之利器－－XDocument,XElement,XAttribute等类

1. //XElement
2. //一个根节点中包含多个子节点，一个节点相当一个XElement
3.             XElement contacts =
4.                 new XElement("Contacts",
5.                     new XElement("Contact",
6.                         new XElement("Name", "Patrick Hines"),
7.                         new XElement("Phone", "206-555-0144"),
8.                         new XElement("Address",
9.                             new XElement("Street1", "123 Main St"),
10.                             new XElement("City", "Mercer Island"),
11.                             new XElement("State", "WA"),
12.                             new XElement("Postal", "68042")
13.                         )
14.                     )
15.                 );
16.             Console.WriteLine(contacts);
17.             //XDocument xdoc = new XDocument();
18.             //xdoc.Add(contacts);
19.             //xdoc.Save(@"d:/test.xml");
20.             //d:/test.xml
21.             //<?xml version="1.0" encoding="utf-8"?>
22.             //<Contacts>
23.             //  <Contact>
24.             //    <Name>Patrick Hines</Name>
25.             //    <Phone>206-555-0144</Phone>
26.             //    <Address>
27.             //      <Street1>123 Main St</Street1>
28.             //      <City>Mercer Island</City>
29.             //      <State>WA</State>
30.             //      <Postal>68042</Postal>
31.             //    </Address>
32.             //  </Contact>
33.             //</Contacts>
35.             //XElement,from,where,select
36.             XElement srcTree = new XElement("Root",
37.                 new XElement("Element", 1),
38.                 new XElement("Element", 2),
39.                 new XElement("Element", 3),
40.                 new XElement("Element", 4),
41.                 new XElement("Element", 5)
42.             );
43.             XElement xmlTree = new XElement("Root",
44.                 new XElement("Child", 1),
45.                 new XElement("Child", 2),
46.                 from el in srcTree.Elements()
47.                 where (int)el > 2
48.                 select el
49.             );
50.             Console.WriteLine(xmlTree);
51.             XDocument xdoc = new XDocument();
52.             xdoc.Add(xmlTree);
53.             xdoc.Save(@"d:/test2.xml");
54.             //d:/test2.xml
55.             //<?xml version="1.0" encoding="utf-8"?>
56.             //<Root>
57.             //  <Child>1</Child>
58.             //  <Child>2</Child>
59.             //  <Element>3</Element>
60.             //  <Element>4</Element>
61.             //  <Element>5</Element>
62.             //</Root>
64. //XAttribute
65.             XDocument xDoc=new XDocument(new XDeclaration("1.0", "UTF-8", "yes"),
66.                 new XComment("test the XDocoument"),
67.                 new XElement("Persion",
68.                     new XAttribute("name", "sky"),
69.                     new XAttribute("age", 25),
70.                     new XElement("company",
71.                         new XAttribute("name","IBM")
72.                         )
73.                     )
74.                 );
75.             Console.WriteLine(xDoc);

1. //报错：“找不到where关键字”
2. //解决方法：
3. //1.在参照设定中追加System.Core
4. //2.使用命名空间：using System.Linq;