Use xmldocument to operate XML files

Xmldocument can be used to conveniently operate XML files.

1. Basic Methods for operating XML files

(1) Add a reference to system. xml and use the using statement to add a reference;

(2) assume that the XML file to be read is as follows:

<? XML version = "1.0" encoding = "UTF-8"?>
<Students>
<Student>
<Name> Zhang liangjing </Name>
<Age> 20 </age>
<Holobby> singing songs </Student>
<Student>
<Name> Zhou jiejie </Name>
<Age> 22 </age>
<Holobby> play with a dual-stick </Student>
</Students>

(3) write programs and add nodes:

Private Static void addnode ()
{
Xmldocument myxml = new xmldocument ();
Myxml. Load ("student. xml"); // read the specified XML document
Xmlnode students = myxml. selectsinglenode ("Students"); // read students Node
Xmlelement newstudent = myxml. createelement ("student ");

Newstudent. setattribute ("class", "10 software ");
Xmlelement name = myxml. createelement ("name ");
Name. innertext = "James ";
Xmlelement age = myxml. createelement ("Age ");
Age. innertext = "20 ";
Xmlelement holobby = myxml. createelement ("holobby ");
Holobby. innertext = "reading ";
Newstudent. appendchild (name );
Newstudent. appendchild (AGE );
Newstudent. appendchild (holobby );
Students. appendchild (newstudent );
Myxml. Save ("student. xml ");
}

(4) Delete A node:

Private Static void delnode ()
{
Xmldocument myxml = new xmldocument ();
Myxml. Load ("student. xml"); // read the specified XML document
Xmlnode student = myxml. selectsinglenode ("// student [name = 'zhang deyou ']"); // read the node
If (student! = NULL)
Student. parentnode. removechild (student );
Myxml. Save ("student. xml ");
}

(5) modify the node value:

Private Static void changenode ()
{
Xmldocument myxml = new xmldocument ();
Myxml. Load ("student. xml"); // read the specified XML document
Xmlnodelist students = myxml. documentelement. childnodes;
Foreach (xmlnode student in students)
{
Xmlelement name = student. selectsinglenode ("name") as xmlelement; // read a node
If (name. innertext. Equals ("Zhang San "))
Name. innertext = "Li Si ";
}
Myxml. Save ("student. xml ");
}

(6) read XML files:

Private Static void readnode ()
{
Xmldocument myxml = new xmldocument ();
Myxml. Load ("student. xml"); // read the specified XML document
Xmlnodelist students = myxml. documentelement. childnodes; // read all student nodes
Foreach (xmlnode student in students) // loop the subnode
{
Foreach (xmlnode node in student. childnodes)
{
// Display the content of each node
Switch (node. Name)
{
Case "name ":
Console. writeline ("Name: {0}", node. innertext );
Break;
Case "Age ":
Console. writeline ("Age: {0}", node. innertext );
Break;
Case "holobby ":
Console. writeline ("Hobbies: {0}", node. innertext );
Break;
}
}
}
}

2. Operate the ASP. NET Website map file:

The format of the website map file web. sitemap is as follows:

<? XML version = "1.0" encoding = "UTF-8"?>
<Sitemapnode url = "default. aspx" Title = "New Book recommendation" Description = "">
<Sitemapnode Title = "C #" url = "Booklist. aspx? Typeid = 1 "Description =" "/>
<Sitemapnode Title = ". Net" url = "Booklist. aspx? Typeid = 25 "Description =" "/>
</Sitemapnode>

/// <Summary>
/// Update all XML
/// </Summary>
Private void modifyxml ()
{
Xmldoctree. Load (server. mappath (catagoryxml ));
Xmldoctree. selectsinglenode ("sitemapnode"). innertext = "";
Foreach (Category catagory in categorymanager. getallcategories ())
{
Makechild (catagory );
}
Xmldoctree. Save (server. mappath (catagoryxml ));
}
/// <Summary>
/// Set the subnode
/// </Summary>
/// <Param name = "catagory"> </param>
Private void makechild (Category catagory)
{
Xmlelement xmlelnode = xmldoctree. createelement ("sitemapnode ");
Xmlelnode. setattribute ("title", catagory. Name );
Xmlelnode. setattribute ("url", booklisturl + catagory. Id. tostring ());
Xmlelnode. setattribute ("Description ","");
Xmldoctree. selectsinglenode ("sitemapnode"). appendchild (xmlelnode );
}