Detailed introduction to the sample code for Linq to read XML

Linq To XML's core class XElement, one XElement represents a node, new XElement("Order"), creates a named Order Label, call Add to add child nodes, which is also an XElement object!

The following are several common forms of LINQ operating XML.

///Write file (generate node properties)

XElement ePersons = new XElement("Persons");
XElement ptom = new XElement("Person"); //增加一个Person节点
ptom.Add(new XElement("Name", "Tom"));//在ptom下再增加子节点
ptom.Add(new XElement("Age", "18"));
ePersons.Add(ptom);

XElement pjack = new XElement("Person");
pjack.Add(new XElement("Name", "Jack"));
pjack.Add(new XElement("Age", "20"));
ePersons.Add(pjack);

Final generation:

Tom
18


Jack
20

///Write file (generate attributesNature)

 XElement ptom = new XElement("Person");
 ptom.Add(new XAttribute("Name", "tom"));//添加XAttribute就生成属性
 ptom.Add(new XAttribute("Age", "18"));
 ePersons.Add(ptom);

 XElement pjack = new XElement("Person");
 pjack.Add(new XAttribute("Name", "jack"));
 pjack.Add(new XAttribute("Age", "20"));
 ePersons.Add(pjack);

Final generation:

<span style="color: #0000ff;"><</span><span style="color: #800000;">Persons</span><span style="color: #0000ff;">></span><br><span style="color: #0000ff;"><</span><span style="color: #800000;">Person </span><span style="color: #ff0000;">Name</span><span style="color: #0000ff;">="tom"</span><span style="color: #ff0000;"> Age</span><span style="color: #0000ff;">="18"</span><span style="color: #0000ff;">/></span><br><span style="color: #0000ff;"><</span><span style="color: #800000;">Person </span><span style="color: #ff0000;">Name</span><span style="color: #0000ff;">="jack"</span><span style="color: #ff0000;"> Age</span><span style="color: #0000ff;">="20"</span><span style="color: #0000ff;">/></span><br><span style="color: #0000ff;"></</span><span style="color: #800000;">Persons</span><span style="color: #0000ff;">></span>

//Read XML and read the value of node format

 XDocument xd= XDocument.Load("XML文件地址");

      foreach (XElement item in xd.Root.Descendants("Person"))//得到每一个Person节点,得到这个节点再取他的Name的这个节点的值
          {
             Console.WriteLine(item.Element("Age").Value);//Person的节点的下得节点为Name的
          }

注释：doc.root(得到根节点的XElement对象).XElement（“tagname”）方法得到的就是节点下第一个名字为tagname的节点。
如果doc.root。XElements（复数形式）就是得到所有的子节点,Descendants("“tagname”")子孙节点

//Read XML and read the value of attribute format

 XDocument xd= XDocument.Load(@"D:\Program Files\Demo\Demo\ConsoleApplication2\XMLFile2.xml");
           foreach (XElement item in xd.Root.Descendants("Person"))//得到每一个Person节点,得到这个节点再取他的Name的这个节点的值
           {
               Console.WriteLine(item.Attribute("Age").Value);//Person的节点的下得节点为Name的
           }

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