How to operate XML in C # .NET requires the namespace to add: use system.xml;
Define several public objects: xmldocument Xmldoc; XMLNode XMLNode; XMLELEMENT XMLEM;
1. Create an XML file to the server's same name directory:
Method 1: Xmldoc = new xmldocument (); // Add XML declaration paragraph, Xmldeclaration Xmldecl; xmldecl = xmldoc.createxmldeclaration ("1.0", "GB2312", NULL); xmldoc.appendchild (xmldecl); // Add a root element XMLELEM = xmldoc.createElement ("" "" ",", "); xmldoc.Appendchild (xmlelem); // Add another element for (INT i = 1; i <3; i ) {
XMLNode root = xmldoc.selectsinglenode ("Employees"); // Find Xmlelement Xe1 = XmLDoc.createElement ("Node"); // Create a Node Xe1.Setattribute ("Genre", "Li Zan Hong") ; // Set the node GENRE attribute XE1.SetaTribute ("ISBN", "2-3631-4"); // Setting the node ISBN property
XMLELEMENT XESUB1 = XMLDoc.createElement ("Title"); Xesub1.innertext = "CS From Getting Started to Wen"; // Settings Text Node XE1.Appendchild (Xesub1); // Add to Node XMLELEment XESUB2 = XMLDOC. CreateElement ("author"); Xesub2.innertext = "Waiting"; Xe1.Appendchild (Xesub2); XMLELEMENT XESUB3 = XMLDoc.createElement ("price"); XESUB3.INNERTEXT = "58.3"; XE1.Appendchild (Xesub3);
Root.appendchild (xe1); // Add to node} // Save the created XML document XMLDoc.save (Server.MAppath ("DATA.XML"));
/ / The content named Data.xml is generated in the directory of the same name. The content is as follows,
xmlWriter = new XmlTextWriter (strFilename, Encoding.Default); // create an xml document xmlWriter.Formatting = Formatting.Indented; xmlWriter.WriteStartDocument (); xmlWriter.WriteStartElement ( "Employees");
XMLWRITER.WRITESTARTELEMENT ("Node"); XMLWRITER.WRITEATTRIBUTESTRING ("Genre", "Li Zanli"); XMLWriter.writeAttributeString ("ISBN", "2-3631-4");
XMLWRITER.WRITESTARTELEMENT ("Title"); XMLWRITER.WRITESTRING ("CS from getting started to proficiency"); xmlwriter.writeEndelement ();
XMLWRITER.WRITESTARTELEMENT ("Author"); XMLWRITER.WRITESTRING ("Waiting"); xmlwriter.writeEndelement ();
XMLWRITER.WRITESTARTELEMENT ("Price"); XMLWRITER.WRITESTRING ("58.3"); XMLWRITER.WRITEENDEEMENT ();
Xmlwriter.writeEndelement ();
Xmlwriter.close (); // Result: cs from Getting Started to Jingjing </ Title> <author> Waiting </ author> <price> 58.3 </ price> <price> </ employees> 2, add a node: xmlDocument xmldoc = new xmlDocument (); xmldoc.Load (Server.MAppath)); XMLNode root = xmldoc.selectsinglenode ("Employees"); // Find <Employees> XMLELEMENT XE1 = XmLDoc.createElement ("Node"); // Create a <Node> Node XE1.SetAttribute ("Genre", "Zhang 3"); // Set this node GENRE attribute XE1.SetAttribute ("ISBN", "1-1111"); // Set this node ISBN property</p>
<p>XMLELEMENT XESUB1 = XMLDoc.createElement ("Title"); Xesub1.innertext = "Getting Started Help"; // Settings Text Node Xe1.Appendchild (Xesub1); // Add to <Node> Node XMLELEMENT XESUB2 = XmLDoc.createElement "author"); Xesub2.innertext = "master"; XE1.Appendchild (Xesub2); XMLELEMENT XESUB3 = XMLDoc.createElement ("price"); XESUB3.INNERTEXT = "158.3"; Xe1.Appendchild (Xesub3);</p>
<p>Root.Appendchild (xe1); // Add to <Employees> Node XMLDoc.save (Server.MAppath ("DATA.XML"));</p>
<p>/ / The result is added to the original content of XML. The content is as follows, <? XML Version = "1.0" encoding = "GB2312"?> <Employees> <node genre = "赞红" isbn = "2- 3631-4 "> <title> CS from getting started </ title> <author> 捷 </ author> <price> 58.3 </ price> </ node> <node genre =" Li Zanhong "ISBN =" 2- 3631-4> <title> CS From Getting Started to Jing </ Title> <Author> Waiting </ Author> <price> 58.3 </ price> </ node> <node genre = "Zhang San" ISBN = "1 -1111-1> <title> C # Getting Started </ title> <author> Master </ author> <price> 158.3 </ price> </ node> </ employees> 3, modify the value of the node (attributes and sub) Node):</p>
<p>XmlDocument Xmldoc = new xmldocument (); xmldoc.load (server.mappath ("data.xml");</p>
<p>XMLNodelist NodeList = XmLDoc.selectsinglenode ("Employees"). ChildNodes; // Get all child nodes in the Employees node</p>
<p>Foreach (XMLNode Xn In nodelist) // Traverse all child nodes {xmlelement XE = (xmlelement) XN; // convert the child node type to XMLELEMENT type if (Xe.GetaTribute ("genre") == "Zhang San") / / If the GENRE property value is "Zhang 3" {xe.setttribute ("genre", "Update Zhang 3"); // Modify this property is "Update Zhang 3"</p>
<p>XMLNodelist NLS = XE.ChildNodes; // Continue all child nodes of the XE child node Foreach (XMLNode XN1 in NLS) // Traversed {XMLELEMENT XE2 = (XMLELEMENT) XN1; // Conversion Type IF (Xe2.Name == "AUTHOR ") // If you find {xe2.innerText =" Assembly "; // modify}}}} xmldoc.save (Server.MAppath (" DATA.XML ")); // Save.</p>
<p>/ / The information of all the nodes has been modified, and the contents of XML are as follows, <? XML Version = "1.0" encoding = "GB2312"?> <Employees> <node genre = "Li Zanhong" ISBN = "2 -3631-4> <title> CS From Getting Started to Open </ Title> <Author> Waiting </ Author> <price> 58.3 </ price> </ node> <node genre = "赞红" ISBN = "2 -3631-4> <title> CS From Getting Started to Jing </ Title> <Author> Waiting </ Author> <price> 58.3 </ price> </ node> <node genre = "Update Zhang 3" ISBN = "1-1111-1"> <title> C # Getting Started </ title> <author> Yak </ author> <price> 158.3 </ price> </ node> </ employees> 4, modify the node (Add Non-point properties and self-junction of nodes: xmlDocument Xmldoc = new xmldocument (); xmldoc.load (Server.MAppath ("DATA.XML");</p>
<p>XMLNodelist NodeList = XmLDoc.selectsinglenode ("Employees"). ChildNodes; // Get all child nodes in the Employees node</p>
<p>Foreach (XMLNode Xn In nodelist) {XMLELEMENT XE = (XMLELEMENT) XN; XE.SetAttribute ("TEST", "111111");</p>
<p>XMLELEMENT XESUB = XMLDoc.createElement ("flag"); Xesub.innertext = "1"; XE.Appendchild (Xesub);} Xmldoc.save (Server.MAppath ("DATA.XML");</p>
<p>/ /: The attribute of each node has added one, the sub-node has also added one, the content is as follows, <? XML Version = "1.0" Encoding = "GB2312"?> <Employees> <node genre = "Li Zanhong "ISBN =" 2-3631-4 "test =" 111111 "> <title> CS from getting started </ title> <author> 捷 </ author> <price> 58.3 </ price> <flag> 1 < / flag> </ node> <node genre = "Li Zanda" ISBN = "2-3631-4" test = "111111"> <title> CS from the entry to the master </ title> <author> 捷 </ author> <price> 58.3 </ price> <flag> 1 </ flag> </ node> <node genre = "Update Zhang 3" ISBN = "1-1111" test = "111111> <title> C # Getting Started </ Title> <author> Yak </ author> <price> 158.3 </ price> <flag> 1 </ flag> </ node> </ employees> 5, delete an attribute in the node: xmlDocument XMLDOC = new XmlDocument (); xmlDoc.Load (Server.MapPath ( "data.xml")); XmlNodeList xnl = xmlDoc.SelectSingleNode ( "Employees") ChildNodes;. foreach (XmlNode xn in xnl) {XmlElement xe = (XmlElement) Xn; Xe.Removettribute ("genre"); // Delete GENRE attribute</p>
<p>XMLNodelist NLS = XE.ChildNodes; // Continue all child nodes of the XE child node Foreach (XMLNode XN1 in NLS) // Traversed {XMLELEMENT XE2 = (XMLELEMENT) XN1; // Conversion Type IF (XE2.Name == "flag ") // If you find {xe.removechild (xe2); // remove}}} xmldoc.save (Server.MAppath (" DATA.XML "));</p>
<p>//] Result: Delete a sub-node of an attribute and node of the node, the content is as follows, <? XML Version = "1.0" encoding = "GB2312"?> <Employees> <node isbn = "2-3631- 4 "Test =" 111111 "> <title> CS From Getting Started> Waiting </ Title> <Author> Waiting </ Author> <price> 58.3 </ price> </ node> <node isbn =" 2-3631- 4 "TEST =" 111111 "> <title> CS from getting started </ title> <author> 捷 </ author> <price> 58.3 </ price> </ node> <node isbn =" 1-1111- 1 "TEST =" 111111 "> <title> C # Getting Started </ title> <author> Ya Sheng </ author> <price> 158.3 </ price> </ node> </ employees> 6, delete node: xmlDocument xmlDoc = new XmlDocument (); xmlDoc.Load (Server.MapPath ( "data.xml")); XmlNode root = xmlDoc.SelectSingleNode ( "Employees"); XmlNodeList xnl = xmlDoc.SelectSingleNode ( "Employees") ChildNodes;. for (INT i = 0; i <xnl.count; i ) {xmlelement XE = (xmlelement) xnl.item (i); if (xe.gettribute ("genre") == "Zhang 3") {root.removechild XE); if (i <xnl.count) i = i-1;}} Xmldoc.save (Server.MAppath ("DATA.XML"));</p>
<p>//] Result: Delete all the nodes of the eligible, the original content:</p>
<p><? XML Version = "1.0" encoding = "gb2312"?> <Employees> <node genre = "Li Zan Hong" ISBN = "2-3631-4"> <title> CS from entry to master </ title> <author> Waiting </ author> <price> 58.3 </ price> </ node> <node genre = "Li Zanli" ISBN = "2-3631-4"> <title> CS from getting started </ title> <author> Waiting </ author> <price> 58.3 </ price> </ node> <node genre = "Zhang 3" ISBN = "1-1111-1"> <title> C # Getting Started Help </ Title> <author> master </ author> <price> 158.3 </ price> </ node> <node genre = "Zhang 3" ISBN = "1-1111-1"> <title> c # Getting Started </ title> <author> master </ Author> <price> 158.3 </ price> </ node> </ employees> Deleted content: <? xml version = "1.0" encoding = "gb2312"?> <Employees> <node genre = "Li Zan Hong" ISBN = "2-3631-4"> <title> CS from the introductory to the master </ title> <author> 捷 </ author> <price> 58.3 </ price> </ node> <node genre = "李赞红" isbn = "2-3631-4"> <title> CS from getting started </ title> <author> 捷 </ author> <price> 58.3 </ price> </ node> </ employees></p>
<p>7, read XML according to the text file</p>
<p>System.IO.StreamReader myFile = new System.IO.StreamReader (Server.MapPath ( "data.xml"), System.Text.Encoding.Default); // Note System.Text.Encoding.Defaultstring myString = myFile.ReadToEnd ( ); // mystring is a read string myfile.close ();</p></div><div class="text-center mt-3 text-grey">
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