Learning Makes - How to use C # to process an XML document.

zhaozj2021-02-16  43

Use the C # to process the XML document.

This article explains how to deal with XML documents in C #, all of which are basic. First, let's build an XML document first, as follows:

Tom Stafford cfo </ title> </ person> <person> <name> Jane Goodwill </ Name> <title> CEO </ Title> </ Person> <Person> <name> Tim Daly </ name> <title> cto </ title> <title2> cto0 </ title2> </ person> <Person> <name> john graver </ name> <title> CSO </ title> </ person> </ people </ peopleList></p> <p>Save it as: people.xml, :)</p> <p>(1) Find the specified node in the XML document, for example: <title2> to find users named 'Tim Daly', the specific procedures are as follows. ---- <% @ page language = "c #"%> <% @ Import namespace = "system.xml"%> <% @ Import namespace = "system.xml.xsl"%> <% @ import namespace = "system.xml.xpath"%> <script language = "c #" runat = " Server> Void Page_Load (Object Obj, Eventargs E) {String XMLFile = "People.xml", XPath; XPath = Server.mAppath (XMLDocument MyDoc = New XMLDocument (); // Defines an XMLDocument object. MYDoc.Load (XPath); message.text = mydoc.selectsinglenode ("// person = 'TIM DALY'). ChildNodes.Item (2) .innerText;} </ script> <ask: label id = "message" forcolor = "red" runat = "server" /></p> <p>Explanation:</p> <p>Among them, // represents the child nodes of any layer inside. This will soon find what you want. SelectsingLenode is a single node, selectnodes can find a lot of nodes</p> <p>(2) Fill in the list box with an XML document, here only use the <name> node.</p> <p><% @ Page language = "C #" debug = "true"%> <% @ import namespace = "system.collections"%> <% @ import namespace = "system.xml"%> <html> <head> <script Language = "c #" runat = "server"> private void page_load (Object sender, eventargs e) {if (! ispostback) {arraylist value = new arraylist (); // Take it as a data source xmlDocument doc = new xmlDocument ); // means XML document doc.load (Server.MAppath ("people)); // Returns an XMLNodeList collection, contains all child generation elements listing with the specified name XMLNodeList ELEMLIST = DOC.GETELEMENTSBYTAME (" Name "); // system.xml namespace</p> <p>For (int i = 0; i <elemlist.count; i ) {values.add (elemlist [i] .innerxml);} listbox1.datasource = values; listbox1.databind ();}}</p> <p>// Get list items, selected text private void submitbtn_click (Object sender, evenetargs e) {if (listbox1.selectedIndIndex> -1) label1.text = "SELECTED OPTION:" ListBox1.selectedItem.Text "<P > ";} </ script> </ head> <body> <form runat = server> <h3> data binding listbox </ h3> <ask: label id =" label1 "font-name =" verdana "font-size = "10pt" runat = "server" /> <ask: listbox id = "listbox1" selectMode = "single" rows = "1" runat = "server" /> <ask: button id = "Button1" text = "SUBMIT "Onclick =" submitbtn_click "runat =" server "/> </ form> </ body> </ html> ========================= ===================== (3) Read the XML document into the Repeater via DataSet. You can also read it into the DataSet. The principle is the same. <% @ Import namespace = "system"%> <% @ Import namespace = "system.io"%> <% @ import name "%> <% @ page language =" c # "%> <html > <head> <title> Read to Repeater </ title> <script language = "c #" runat = server> public void page_load (object obj, eventargs e) {string xpath = "db / person.xml"; try { DataSet DS = New Dataset (); FileStrea M fs = new filestream (server.mappath (xpath), filemode.open, fileaccess.read, fileshare.readwrite; DS.ReadXML (New StreamReader (fs)); fs.close ();</p> <p>Trace.warn ("Table Record Number", Convert.TOString (DS.Tables [0] .Rows.count); mydatalist.datasource = ds.tables [0] .defaultview; mydatalist.database ();} catch (Exception ED) {response.write ("<font color = # ff0000> ed.tostring () " </ font> ");}} </ script> </ head> <body> <ask: repeater ID = "MyDataList" runat = "server"> <headertemplate> <h5> Viewer Details </ h5> </ headertemplate> <itemtemplate> <BR> <table class = "Mainheads" width = "60%" Style = "font: 8pt Verdana> <tr style = "background-color: #ffffcc"> <td> name: </ td> <td> <% # databinder.eval (container.dataitem, "name")%> </ td> < / TR> <tr style = "background-color: #ffffcc"> <td> title: </ td> <td> <% # databinder.eval (container.DataItem, "Title")%> </ td> < / TR> <tr style = "background-color: #ffffcc"> <td> title2: </ td> <td> <% # databinder.eval (container.DataItem, "Title2")%> </ td> < / TR> </ table> <br> </ itemtemplate> </ ask: repeater> </ body> </ html></p> <p>-------- (4) Save the data in the Repeater to XML, which can be used in DataSet., The example adds a new line and saves the editor to XML < % @ Import namespace = "system"%> <% @ import namespace = "system.io"%> <% @ import name "%> <% @ page language =" c # "trace =" true " %> <html> <head> <title> saurabh's xml counter, = "c #" runat = server> public void page_load (object obj, eventargs e) {string datafile = "db / people.xml "; If (! Page.ispostback) {Try {DataSet DS = new Dataset (); filestream finT; fint = new filestream (server.mappath (datafile), filemode.open, fileaccess.read, fileshare.readwrite; DS. ReadXML (FINT); FINT.CLOSE (); IF (session ["counter"] == null) {DATAROW DR = DS.TABLES [0] .newrow (); DR ["name"] = "myname"; DR ["TITLE"] = "Test"; DR ["Title2"] = "Test2"; DS.TABLES [0] .Rows.Add (DR); filestream fout; fout = new filestream (server.mappath (datafile), FileMode.open, FileAccess.write, Fileshare.Readwrite; DS.WRI TEXML (Fout, XMLWRITE.WRITESCHEMA); fout.close (); session ["counter"] = "set";} TRACE.WARN ("Table Record Number", DS.Tables [0]. 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