I am using a very stupid method, but can help beginners understand the process of accessing the XML node.
One XML file is known (bookstore.xml) is as follows:
Oberon's legacy </ title></p>
<p><Author> Corets, EVA </ author></p>
<p><price> 5.95 </ price></p>
<p></ book></p>
<p></ bookstore></p>
<p>1. Insert a <book> node into the <BookStore> node:</p>
<p>XMLDocument Xmldoc = new xmldocument ();</p>
<p>XMLDoc.Load ("BookStore.xml");</p>
<p>XMLNode root = xmldoc.selectsinglenode ("bookstore"); // Find <bookstore></p>
<p>XMLELEMENT XE1 = XMLDoc.createElement ("Book"); // Create a <book> node</p>
<p>Xe1.setttribute ("Genre", "Li Zanhong"); // Set this node GENRE attribute</p>
<p>Xe1.SetaTRibute ("ISBN", "2-3631-4"); // Setting this node ISBN property</p>
<p>XMLELEMENT XESUB1 = Xmldoc.createElement ("Title");</p>
<p>Xesub1.innerText = "CS from getting started to proficiency"; // Set text node</p>
<p>XE1.Appendchild (Xesub1); // Add to <Book> Node</p>
<p>XMLELEMENT XESUB2 = Xmldoc.createElement ("Author");</p>
<p>XESUB2.INNNERTEXT = "Waiting";</p>
<p>XE1.Appendchild (Xesub2);</p>
<p>XMLELEMENT XESUB3 = Xmldoc.createElement ("Price");</p>
<p>XESUB3.INNNERTEXT = "58.3";</p>
<p>Xe1.appendchild (Xesub3);</p>
<p>Root.Appendchild (Xe1); // Add to <BookStore> Node</p>
<p>XMLDoc.save ("BookStore.xml");</p>
<p>/ / =======================================================================================</p>
<p>The result is:</p>
<p><? XML Version = "1.0" encoding = "GB2312"?></p>
<p><bookstore></p>
<p><book genre = "fantasy" ISBN = "2-3631-4"></p>
<p><title> Oberon's Legacy </ title> <author> Corets, EVA </ author></p>
<p><price> 5.95 </ price></p>
<p></ book></p>
<p><book genre = "李赞红" ISBN = "2-3631-4"></p>
<p><title> CS from getting started to master </ Title></p>
<p><Author> Waiting </ Author></p>
<p><price> 58.3 </ price></p>
<p></ book></p>
<p></ bookstore></p>
<p>2. Modify the node: Change the genre value of the GENRE attribute value to the node of "Li Zanhong" to "Update Li Zanli", and modify the text of the child's child's child <author> to "Ansheng".</p>
<p>XMLNodelist nodelist = xmldoc.selectsinglenode ("bookstore"). ChildNodes; // Get all child nodes in the BookStore node</p>
<p>Foreach (XMLNode Xn In nodelist) // Traverse all child nodes</p>
<p>{</p>
<p>XMLELEMENT XE = (XMLELEMENT) XN; // Convert the child node type to XMLELEMENT type</p>
<p>IF (Xe.GetaTribute ("genre") == "Li Zanhong" // If the GENRE attribute value is "Li Zanhong"</p>
<p>{</p>
<p>Xe.setttribute ("Genre", "Update Li Zanli"); // Modify this property as "Update Li Zanli"</p>
<p>XMLNodelist NLS = Xe.childNodes; // Continue all child nodes of the XE child node</p>
<p>Foreach (XMLNode XN1 in NLS) // Traverse</p>
<p>{</p>
<p>XMLELEMENT XE2 = (XMLELEMENT) XN1; // Conversion Type</p>
<p>IF (xe2.name == "author") // If you find</p>
<p>{</p>
<p>Xe2.innertext = "Assembly"; // modified</p>
<p>Break; // Find out to exit it.</p>
<p>}</p>
<p>}</p>
<p>Break;</p>
<p>}</p>
<p>}</p>
<p>XMLDoc.save ("BookStore.xml"); // Save.</p>
<p>/ / =========================================================================================================================================================================================== ==</p>
<p>The last result is:</p>
<p><? XML Version = "1.0" encoding = "GB2312"?></p>
<p><bookstore></p>
<p><book genre = "fantasy" ISBN = "2-3631-4"></p>
<p><title> Oberon's legacy </ title></p>
<p><Author> Corets, EVA </ author></p>
<p><price> 5.95 </ price></p>
<p></ book></p>
<p><book genre = "Update Li Zanli" ISBN = "2-3631-4"></p>
<p><title> CS from getting started to the master </ title> <author> Yak </ author></p>
<p><price> 58.3 </ price></p>
<p></ book></p>
<p></ bookstore></p>
<p>3, delete <book genre = "fantasy" ISBN = "2-3631-4"> Node's GENRE attribute, delete <book genre = "Update Li Zanhong" ISBN = "2-3631-4"> node.</p>
<p>XMLNodelist XNL = XmLDoc.selectsinglenode ("BookStore"). ChildNodes;</p>
<p>Foreach (XMLNode Xn In XNL)</p>
<p>{</p>
<p>XMLELEMENT XE = (XMLELEMENT) XN;</p>
<p>IF (Xe.GetaTribute ("genre") == "fantasy")</p>
<p>{</p>
<p>Xe.Removettribute ("genre"); // Delete GENRE attribute</p>
<p>}</p>
<p>Else IF (Xe.GetaTRibute ("genre") == "Update Li Zanli")</p>
<p>{</p>
<p>Xe.removeAll (); // Delete the entire content of the node</p>
<p>}</p>
<p>}</p>
<p>XMLDoc.save ("BookStore.xml");</p>
<p>/ / ========================================================================</p>
<p>The last result is:</p>
<p><? XML Version = "1.0" encoding = "GB2312"?></p>
<p><bookstore></p>
<p><book isbn = "2-3631-4"></p>
<p><title> Oberon's legacy </ title></p>
<p><Author> Corets, EVA </ author></p>
<p><price> 5.95 </ price></p>
<p></ book></p>
<p><book></p>
<p></ book></p>
<p></ bookstore></p>
<p>4, display all data.</p>
<p>XMLNode XN = Xmldoc.selectsinglenode ("BookStore");</p>
<p>XMLnodelist XNL = xn.childnodes;</p>
<p>Foreach (XMLNode Xnf in XL)</p>
<p>{</p>
<p>XMLELEMENT XE = (XMLELEMENT) XNF;</p>
<p>Console.WriteLine (Xe.GetaTribute ("genre"); // Displays property values</p>
<p>Console.writeline (Xe.GetaTRibute ("ISBN"));</p>
<p>XMLNodelist XNF1 = Xe.childNodes;</p>
<p>Foreach (XMLNode XN2 in Xnf1)</p>
<p>{</p>
<p>Console.writeline (xn2.innertext); // Displays subtitle text</p>
<p>}</p>
<p>}</p></div><div class="text-center mt-3 text-grey">
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