C # Xml Linq XDocument Basic operations

Person.xml

<?XML version= "1.0" encoding= "Utf-8"?><MyP>  <P1>    < PersonID= "cz001">      <Name>Tom</Name>      < Age>18</ Age>    </ Person>    < PersonID= "cz002">      <Name>John doe</Name>      < Age>19</ Age>    </ Person>    < PersonID= "cz003">      <Name>Harry</Name>      < Age>20</ Age>    </ Person>  </P1>  <P2>    < Person>      <Name>Zhang 32</Name>      < Age>18</ Age>    </ Person>    < Person>      <Name>Lee 42</Name>      < Age>19</ Age>    </ Person>    < Person>      <Name>Wang 52</Name>      < Age>20</ Age>    </ Person>  </P2></MyP>

View Code

usingSystem;usingSystem.Collections.Generic;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingSystem.Linq;usingSystem.Text;usingSystem.Threading.Tasks;usingSystem.Windows.Forms;namespaceXML Operation { Public Partial classForm1:form { PublicForm1 () {InitializeComponent (); }        Private voidButton1_Click (Objectsender, EventArgs e) {            //Read XMLSystem.Xml.Linq.XDocument Xdoc = System.Xml.Linq.XDocument.Load ("Person.xml"); System.Xml.Linq.XElement Xeroot= Xdoc. Root;//root nodeSystem.Xml.Linq.XElement Xele = xeroot.element ("P1"). Element (" Person");//child NodesMessageBox.Show ("id="+ Xele. Attribute ("ID"). Value);//cz001            foreach(varEleinchXele. Elements ()) {stringstr =string. Format ("Name={0},value={1}", Ele. Name.tostring (), Ele.                Value);            MessageBox.Show (str); }        }        Private voidForm1_Load (Objectsender, EventArgs e) {            //* Read XML data loaded into the TreeView1 list. //1. Load Person.xmlSystem.Xml.Linq.XDocument Xdoc = System.Xml.Linq.XDocument.Load ("Person.xml"); //2. Get root node, MyPSystem.Xml.Linq.XElement Xeroot =Xdoc.            Root; //3. Add the root node to the TreeView1 firstTreeNode Treeviewroot =TreeView1.Nodes.Add (xeRoot.Name.LocalName); //4. Start traversing all child nodes, using recursionloadtreenodes (Xeroot, treeviewroot); //* Write XML file. //1. Creating an XML ObjectSystem.Xml.Linq.XDocument XDocument =NewSystem.Xml.Linq.XDocument (); //2. Create a node withSystem.Xml.Linq.XElement Eroot =NewSystem.Xml.Linq.XElement ("root node"); //Add to XdocXDocument.            ADD (Eroot); //3. Add child nodesSystem.Xml.Linq.XElement Ele1 =NewSystem.Xml.Linq.XElement ("child Node 1"); Ele1. Value="Content 1";            Eroot.add (ELE1); //4. Adding properties for ELE1 nodesSystem.Xml.Linq.XAttribute attr =NewSystem.Xml.Linq.XAttribute ("URL","http://www.baidu.com"); Ele1.                        ADD (attr); //5. Quick Add child node methodEroot.setelementvalue ("child Node 2","Content 2"); //6. Quickly add attributesEle1. Setattributevalue ("ID", A); //7, last saved to a file, can also be written to the stream. XDocument. Save ("123.xml"); }        Private voidloadtreenodes (System.Xml.Linq.XElement xeroot, TreeNode treeviewroot) {//loop all the content below the Xeroot on the TreeView            foreach(System.Xml.Linq.XElement eleinchxeroot.elements ()) {                //determine if there are child nodes under the Child root node                if(Ele. Elements (). Count () >0) {TreeNode node= TreeViewRoot.Nodes.Add (ele. Name.tostring ());//Write Name Value//Get property methods on a nodeSystem.Xml.Linq.XAttribute attr = ele. Attribute ("ID"); if(attr! =NULL) {node. Text+=string. Format ("[{0}={1}]", attr. Name, attr.                    Value); } loadtreenodes (ele, node); //Traversal Loops                }                Else{treeViewRoot.Nodes.Add (ele). Value); //write value under the node                }            }        }    }}

C # Xml Linq XDocument Basic operations