C # Create an instance code share that reads and writes to an XML file

This article mainly introduced the C # creation, reads, writes the XML file The method, has the very good reference value. Let's take a look at the little series.

The XML file is as follows:

<?xml version= "1.0" encoding= "Utf-8"?> <Advertisements> <Ad> <imageurl>001.jpg</imageurl > <NavigateUrl>001.aspx</NavigateUrl> <Impressions>10</Impressions> <Keyword> gucas01</keyword> </Ad> <Ad> <ImageUrl>002.jpg</ImageUrl> <navigateurl>002. aspx</navigateurl> <Impressions>20</Impressions> <Keyword>gucas02</Keyword> </ad > <Ad> <ImageUrl>003.jpg</ImageUrl> <NavigateUrl>003.aspx</NavigateUrl> < impressions>30</impressions> <Keyword>gucas03</Keyword> </Ad> <Ad> <imageurl >004.jpg</ImageUrl> <NavigateUrl>004.aspx</NavigateUrl> <impressions>40</ impressions> <Keyword>gucas04</Keyword> </Ad> <Ad> <imageurl>005.jpg</imageurl > <NavigateUrl>005.aspx</NavigateUrl> <impressions>50</impressions> <Keyword>gucas05</Keyword> </Ad> <Ad> <imageurl>google.gif</imageurl > <NavigateUrl>http://www.google.com</NavigateUrl> <Impressions>30</Impressions> < Keyword>google</keyword> </Ad> </Advertisements>

operations on XML files

<summary>//Create XML file///</summary>//<param name= "filename" ></param> public void creat   Exmlfile (string filename) {XmlDocument xmldoc = new XmlDocument ();   XmlNode node; node = xmldoc.   Createxmldeclaration ("1.0", "Utf-8", null); XmlDoc.   AppendChild (node); XmlNode root = xmldoc.   CreateElement ("Users"); XmlDoc.   AppendChild (root);   CreateNode (xmldoc, Root, "UserName", "zhengyd");   CreateNode (xmldoc, Root, "Email", "ZHENGYD@GUCAS.AC,CN");   CreateNode (xmldoc, Root, "Url", "WWW.GUCAS.AN,CN");   CreateNode (xmldoc, Root, "age", "27"); try {xmldoc.    Save (Server.MapPath (filename));   Response.Write ("Create XML file Myxml.xml succeeded!"); } catch (Exception ex) {Response.Write (ex.   Message); }}///<summary> Write XML file////</summary>//<param name= "file" ></param> public void Wri   Texmlfile (string file) {XmlDocument Xmdoc = new XmlDocument (); try {Xmdoc.    Load (Server.MapPath (file)); XmlNode root = Xmdoc. SelEctsinglenode ("advertisements"); if (root = null) {XmlNode node = Xmdoc.     CreateNode (XmlNodeType.Element, "Ad", null);     CreateNode (Xmdoc, node, "ImageUrl", "google.gif");     CreateNode (Xmdoc, node, "NavigateUrl", "http://www.google.com");     CreateNode (Xmdoc, node, "Impressions", "30");     CreateNode (Xmdoc, node, "Keyword", "Google"); Root.    AppendChild (node); } xmdoc.    Save (Server.MapPath (file)); Response.Write ("Write XML file XMLFile.xml succeeded.   <br> "); } catch (Exception ex) {Response.Write (ex.   Message); }}///<summary>//Create Nodes///</summary>//<param name= "xmldoc" ></param>//<param NA Me= "ParentNode" ></param>//<param name= "name" ></param>//<param name= "value" ></ param> public void CreateNode (XmlDocument xmldoc, XmlNode parentnode, string name, String value) {XmlNode node = x Mldoc.   CreateNode (xmlnodetype.element, name, NULL); Node.   InnerText = value; ParentNode. AppendChild (nODE); }///<summary>///Read XML file///</summary>//<param name= "file" ></param> private void READF   Ile (string file) {XmlDocument xmldoc = new XmlDocument (); try {xmldoc.    Load (Server.MapPath (file)); XmlNode node = xmldoc.    selectSingleNode ("advertisements");     if (node! = null) {TreeNode root = new TreeNode (); Root. Text = node.     Name;     TVXML.NODES.ADD (root); foreach (XmlNode xnode in xmldoc.      SelectNodes ("Advertisements/ad")) {TreeNode tnode = new TreeNode (); Tnode. Text = Server.HTMLEncode ("<" + XNode.      Name + ">"); Root.       Childnodes.add (tnode); foreach (XmlNode xcnode in XNode.        ChildNodes) {TreeNode Tcnode = new TreeNode (); Tcnode. Text = Server.HTMLEncode ("<" + Xcnode. Name + ">" + xcnode. InnerText + "</" + Xcnode.        Name + ">"); Tnode.       Childnodes.add (Tcnode);      } TreeNode Ttnode = new TreeNode (); Ttnode. Text = Server.HTMLEncode ("</" + xnode. Name + ""); Root.     Childnodes.add (Ttnode);     } TreeNode Tpnode = new TreeNode (); Tpnode. Text = Server.HTMLEncode ("</" + node.     Name + ">");    TVXML.NODES.ADD (Tpnode); }} catch (Exception ex) {Response.Write (ex).   Message); }  }