C # sample code sharing to implement additions and deletions of XML documents

This article mainly introduced the C # Implementation of XML document deletion and modification function, combined with examples of the creation of XML documents and C # for XML document loading and deletion and modification of the operation skills, the need for friends can refer to the next

In this paper, we describe the function of C # to implement additions and deletions of XML documents. Share to everyone for your reference, as follows:

1. Create an instance XML file (books.xml)

<?xml version= "1.0" encoding= "iso-8859-1"?><bookstore> <book id= "1" category= "COOKING" > <title Lang= "en" >everyday italian</title> <author>giada De laurentiis</author> <year>2005</ year> <price>30.00</price> </book> <book id= "2" category= "Children" > <title lang= "en" >harry potter</title> <author>j K. rowling</author> <year>2005</year> <price> 29.99</price> </book> <book id= "3" category= "WEB" > <title lang= "en" >xquery Kick start</ title> <author>james mcgovern</author> <author>per bothner</author> <author>Kurt  cagle</author> <author>james linn</author> <author>vaidyanathan Nagarajan</author> <year>2003</year> <price>49.99</price> </book> <book id= "4" category= "WEB" > < Title lang= "en" >learning xml</title> <author>erik T. ray</author> <year>2003</year> <price>39.95</price> </book></bookstore >

2. Create book Information entity class (BookInfo.cs)

public class bookinfo{//<summary>///  book ID//</summary> public  int BookId {set; get;} //<summary>///Book name///  </summary> public  string Title {set; get;}  <summary>////book category///  </summary> Public  string category {set; get;}  <summary>///Book language///  </summary> public  string Language {set; get;}  <summary>///book author///  </summary> public  string Author {set; get;}  <summary>///Publishing time///  </summary> public string year  {set; get;}  <summary>///Sales price///  </summary> Public decimal prices  {set; get;}}

3. Create book Information business logic class (BookInfoBLL.cs)

Using System.Xml; Reference related files public class bookinfobll{private string _basepath = AppDomain.CurrentDomain.SetupInformation.ApplicationBase + @ "/xml/books.xml";  XML file path private XmlDocument _booksxmldoc = null; Create XML Document Object public Bookinfobll () {try {_booksxmldoc = new XmlDocument ();//Initialize XML Document Object _booksxmldoc.loa   D (_basepath); Load the specified XML document} catch (Exception ex) {throw new Exception ("Error loading XML document:" + ex.)    Message); }}///<summary>///Get a list of books (check)///</summary>//<param name= "param" > Parameter conditions </param>//< Returns> Books list </returns> public list<bookinfo> getbookinfolist (BookInfo param) {list<bookinfo> bo    Okinfolist = new list<bookinfo> (); String XPath = "Bookstore/book"; The default gets all books if (param. BookId! = 0)//based on book ID query {xPath = String.Format ("/bookstore/book[@id = ' {0} ']", Param.    BOOKID); } else if (! String.IsNullOrEmpty (param. category)//query according to book type {XPath = String.Format ("/bookstore/book[@category = ' {0} '] ", Param.    Category); } else if (! String.IsNullOrEmpty (param. Title)//According to the book name query {xPath = String.Format ("/bookstore/book[title= ' {0} ']", Param.    Title);    } XmlNodeList booksxmlnodelist = _booksxmldoc.selectnodes (XPath);      foreach (XmlNode booknode in booksxmlnodelist) {BookInfo BookInfo = new BookInfo (); Bookinfo.bookid = Convert.ToInt32 (booknode.attributes["id"]. Value); Gets the property value Bookinfo.category = booknode.attributes["Category"].      Value; Bookinfo.language = Booknode.selectsinglenode ("title"). attributes["Lang"]. Value; Gets the property value of the child node Bookinfo.title = Booknode.selectsinglenode ("Title").   InnerText; Gets the element value Bookinfo.author = Booknode.selectsinglenode ("Author").      InnerText; Bookinfo.year = Booknode.selectsinglenode ("year").      InnerText; Bookinfo.price = Convert.todecimal (Booknode.selectsinglenode ("Price").      InnerText);    Bookinfolist.add (BookInfo);  } return bookinfolist; }///<summary>//Add BooksInformation (Increase)///</summary>//<param name= "param" ></param>//<returns></returns> public Boo    L addbookinfo (BookInfo param) {bool result = false; XmlNode root = _booksxmldoc.selectsinglenode ("bookstore");    Find <bookstore>//create node XmlElement bookxmlelement = _booksxmldoc.createelement ("book");    XmlElement titlexmlelement = _booksxmldoc.createelement ("title");    XmlElement authorxmlelement = _booksxmldoc.createelement ("author");    XmlElement yearxmlelement = _booksxmldoc.createelement ("year");    XmlElement pricexmlelement = _booksxmldoc.createelement ("price"); Assigns a value to the node Bookxmlelement.setattribute ("id", param.    Bookid.tostring ()); Bookxmlelement.setattribute ("category", Param.    Category); Titlexmlelement.innertext = param. Title; add element value Titlexmlelement.setattribute ("lang", param) to the node. Language);//Add the attribute value Authorxmlelement.innertext = param to the node.    Author; Yearxmlelement.innertext = param.    year; Pricexmlelement.innertext = param. PriCe.    ToString ();    AppendChild adds the specified node to the end of the node's child nodes list Bookxmlelement.appendchild (titlexmlelement);    Bookxmlelement.appendchild (authorxmlelement);    Bookxmlelement.appendchild (yearxmlelement);    Bookxmlelement.appendchild (pricexmlelement); Root.    AppendChild (bookxmlelement);    _booksxmldoc.save (_basepath);    result = true;  return result; }//<summary>//Modify the book Information (change)///</summary>//<param name= "param" ></param>//<returns    ></returns> public bool Editbookinfo (BookInfo param) {bool result = false; if (param. bookid>0) {String xPath = String.Format ("/bookstore/book[@id = ' {0} ']", Param.      BOOKID);      XmlNode Editxmlnode = _booksxmldoc.selectsinglenode (XPath);      XmlElement editxmlelement = (XmlElement) Editxmlnode; if (editxmlelement! = null) {editxmlelement.attributes["category"]. Value = param.        Category; Editxmlelement.selectsinglenode ("title"). attributes["Lang"]. Value = param.    Language;    Editxmlelement.selectsinglenode ("title"). InnerText = param.        Title; Editxmlelement.selectsinglenode ("Author"). InnerText = param.        Author; Editxmlelement.selectsinglenode ("Year"). InnerText = param.        year; Editxmlelement.selectsinglenode ("Price"). InnerText = param.        Price.tostring ();        _booksxmldoc.save (_basepath);      result = true;  }} return result; }///<summary>//delete book information (delete)///</summary>//<param name= "param" ></param>//<returns    ></returns> public bool Deletebookinfo (BookInfo param) {bool result = false; if (param. BookId > 0) {string xPath = String.Format ("/bookstore/book[@id = ' {0} ']", Param.      BOOKID);      XmlNode Delxmlnode = _booksxmldoc.selectsinglenode (XPath); if (Delxmlnode! = null) {_booksxmldoc.selectsinglenode ("bookstore").  RemoveChild (Delxmlnode);        Removes the specified child node _booksxmldoc.save (_basepath);      result = true;  }} return result; }}