ASP. NET-Using XML

Simple additions, deletions, modifications, and viewing of XML files.

XML code:

<?XML version= "1.0" encoding= "UTF-8"?><Books> < Book>  <name>Harry potter</name>  < Price>10</ Price>  <Memo>This is a good-looking book.</Memo> </ Book> < BookID= "B02">  <name>Three kingdoms</name>  < Price>10</ Price>  <Memo>One of the four major masterpieces.</Memo> </ Book> < BookID= "B03">  <name>Water Margin</name>  < Price>6</ Price>  <Memo>One of the four major masterpieces.</Memo> </ Book> < BookID= "B04">  <name>Red House</name>  < Price>5</ Price>  <Memo>One of the four major masterpieces.</Memo> </ Book></Books>  

C # code:

usingSystem;usingSystem.Xml;namespacexmldemo{classProgram {Static voidMain (string[] args) {XmlElement Thebook=NULL, Theelem =NULL, root =NULL; XmlDocument xmldoc=NewXmlDocument (); Try{xmldoc. Load (@"C:\Users\HF_Ultrastrong\Desktop\WFA_Test\XMLDemo\Books.xml"); Root=xmldoc.                DocumentElement; //---Start a new book----Thebook = xmldoc. CreateElement (" Book"); Theelem= xmldoc. CreateElement ("name"); Theelem.innertext="new book";                Thebook.appendchild (Theelem); Theelem= xmldoc. CreateElement (" Price"); Theelem.innertext=" -";                Thebook.appendchild (Theelem); Theelem= xmldoc. CreateElement ("Memo"); Theelem.innertext="The new book looks better. ";                Thebook.appendchild (Theelem); Root.                AppendChild (Thebook); Console.Out.WriteLine ("---Start a new book----"); Console.Out.WriteLine (Root.                OuterXml); //---Create a new book to complete----//---The following to make some changes to the "Harry Potter". ----                //---Search for "Harry Potter"----Thebook = (XmlElement) root. selectSingleNode ("/books/book[name= ' Harry Potter '"); Console.Out.WriteLine ("---Find Harry Potter----");                Console.Out.WriteLine (Thebook.outerxml); //---Revise the price of the book at this time-----//getElementsByTagName returns the nodelist, so keep the item (0). In addition, getElementsByTagName ("price") is equivalent to selectnodes (".//Price "). Thebook.getelementsbytagname (" Price"). Item (0). InnerText =" the"; Console.Out.WriteLine ("---Revise the price of the book at this time----");                Console.Out.WriteLine (Thebook.outerxml); //---also want to add an attribute ID with a value of B01----Thebook.setattribute ("ID","B01"); Console.Out.WriteLine ("---also want to add an attribute ID with a value of B01----");                Console.Out.WriteLine (Thebook.outerxml); //---to the completion of the revision of Harry Potter. ----                //---Delete all books with a price below 10----Thebook = (XmlElement) root. selectSingleNode ("/books/book[@id = ' B02 ')"); Console.Out.WriteLine ("---Want to delete the book "Kingdoms" with the id attribute----");                Console.Out.WriteLine (Thebook.outerxml);                TheBook.ParentNode.RemoveChild (Thebook); Console.Out.WriteLine ("---The deleted XML----"); Console.Out.WriteLine (xmldoc.                OuterXml); //---Delete all books with a price below 10----XmlNodeList Somebooks = root. SelectNodes ("/books/book[price<10]"); Console.Out.WriteLine ("---Delete all books with a price below 10---"); Console.Out.WriteLine ("---Eligible books are"+ Somebooks.count +"this. ---");  for(inti =0; i < Somebooks.count; i++) {Somebooks.item (i).                Parentnode.removechild (Somebooks.item (i)); } Console.Out.WriteLine ("---The deleted XML----"); Console.Out.WriteLine (xmldoc.                OuterXml); XmlDoc. Save ("books.xml");//Save to Books.xmlConsole.In.Read (); }            Catch(Exception e) {Console.Out.WriteLine (e.message);        } console.readkey (); }    }}

Effect:

ASP. NET-Using XML