To update information in an XML node by using LINQ

The XML is as follows

<?xml version= "1.0" encoding= "Utf-8"?> <friends> <friend> <name> <firstname>guo& lt;/firstname> <lastName>Hu</lastName> </name> <address> <province>sh
    anghai</province> <city>PuDong</city> </address> </friend> <friend>
    <name> <firstName>Lei</firstName> <lastName>Hu</lastName> </name>
  <address> <province>hubei</province> <city>xiantao</city> </address> </friend> <friend> <name> <firstName>JunWen</firstName> <lastname>l i</lastname> </name> <address> <province>hubei</province> <city>wu han</city> </address> </friend> <friend> <name> <firstname>jinhao&lt ;/firstname> &Lt;lastname>liu</lastname> </name> <address> <province>ShanXi</province> <city>Taiyuan</city> </address> </friend> <friend> <name> <fir
      stname>cheng</firstname> <lastName>Fang</lastName> </name> <address> 
  <province>guangDong</province> <city>guangZhou</city> </address> </friend> <friend> <name> <firstName>Cheng</firstName> <lastname>fang</lastname&
    Gt
    </name> <address> <province>HuBei</province> <city>xianTao</city> </address> </friend> </friends>

The condition is that FirstName is cheng,lastname for Fang Modification province for Hubei,city for Wuhan

		XElement Elements = xelement.load (Server.MapPath (". /linqxml/linq1.xml "));

		var elements = from element in elements.descendants ("friend")
						where
						(from the El in
						element. Elements ("name")
						where
							el. Element ("FirstName"). Value = = "Cheng"
							&& el. Element ("LastName"). Value = = "Fang"
						select El
						). Any ()
						select element. Element ("Address");
		if (elements! = null)
		{
			elements. ToList (). ForEach (q =
				{
					q.setelementvalue ("province", "Hubei");
					Q.setelementvalue ("City", "Wuhan");
				});
		Elements.save (@ "D:\Practise\RegexDemo\Linqxml\linq1.xml");

2.

The XML is as follows

<DataBind> <ListItem> <ListItemID>1</ListItemID> <databindcateid>1</databindcat Eid> <DataValueField>1</DataValueField> <DataTextField> Order issues </DataTextField> <dat acolorfield> #F70909 </DataColorField> <ParentID>0</ParentID> </ListItem> &LT;LISTITEM&G
    T <ListItemID>2</ListItemID> <DataBindCateID>1</DataBindCateID> <datavaluefield>new V alue</datavaluefield> <datatextfield>new text</datatextfield> <DataColorField>new color&lt ;/datacolorfield> <ParentID>1</ParentID> </ListItem> <ListItem> <listitemid>3  </ListItemID> <DataBindCateID>1</DataBindCateID> <DataValueField> Dear customer, We

			has temporarily held your order.

			Would share us why do you want to cancel your order? If there ' s problem with the SKU, QuanTity or the shipping address,we can update it for you. </DataValueField> <DataTextField> ask for order cancellation reasons </DataTextField> <DataColorField> #000000 </ datacolorfield> <ParentID>2</ParentID> </ListItem> </DataBind>

Modify the value of Datacolorfield,datatextfield,datavaluefield for a query condition of Listitemid to 2

		XElement Elements = xelement.load (Server.MapPath (". /linqxml/linq1.xml "));

		var elements = from element in Elements.descendants ("ListItem")
					   where element. Element ("Listitemid"). Value = = "2"
					   select element;

		if (elements! = null)
		{
			elements. ToList (). ForEach (q =
				{
					q.setelementvalue ("Datacolorfield", "Your Color");
					Q.setelementvalue ("DataTextField", "Your Text");
					Q.setelementvalue ("DataValueField", "Your Value");
				});
		Elements.save (@ "D:\Practise\RegexDemo\Linqxml\linq1.xml");