C # xml operations

Let's take a look at the use of XML in C #.

In fact, an XML file will exist in the form of a DOM tree after being added to the memory,

Therefore, operations on an XML file are ultimately an operation on the Dom,

First, let's take a look at the general structure of the XML file.

That is, a student in a school has a student ID, name, gender, and age.

 

<? XML version = "1.0" encoding = "UTF-8"?>

<School>

<Student number = "001">

<Name> Xiaozhen </Name>

<Sex> male </sex>

<Age> 20 </age>

</Student>

<Student number = "002">

<Name> baobei </Name>

<Sex> male </sex>

<Age> 20 </age>

</Student>

<Student number = "003">

<Name> Suha </Name>

<Sex> female </sex>

<Age> 21 </age>

</Student>

<Student number = "004">

<Name> baobeime </Name>

<Sex> female </sex>

<Age> 20 </age>

</Student>

</School> 

 

 Then the basic operation is performed on it.

Public class getallxmldata

{

Private string xmlpath;

Public getallxmldata (string path)

{

Xmlpath = path;

}

// Obtain all data in the XML file of the specified path

// Return the dataset as a dataview object

Public dataview getxmldataview ()

{

Datatable mytable = new datatable ();

Datarow myrow;

Mytable. Columns. Add ("student ID", type. GetType ("system. String "));

Mytable. Columns. Add ("name", type. GetType ("system. String "));

Mytable. Columns. Add ("gender", type. GetType ("system. String "));

Mytable. Columns. Add ("Age", type. GetType ("system. String "));

Xmldocument xmldoc = new xmldocument ();

Xmldoc. Load (xmlpath );

Xmlelement root = xmldoc. documentelement;

Foreach (xmlnode node in root. childnodes)

{

Myrow = mytable. newrow ();

Myrow ["student ID"] = node. attributes ["Number"]. value;

Myrow ["name"] = node. selectsinglenode ("./Name"). innertext;

Myrow ["gender"] = node. selectsinglenode ("./sex"). innertext;

Myrow ["Age"] = node. selectsinglenode ("./age"). innertext;

Mytable. Rows. Add (myrow );

}

Return mytable. defaultview;

}

}

Another example is to add a new data entry to the XML file.

Public void insertxmldata (string xmlpath)

{

Xmldocument xmldoc = new xmldocument ();

Xmldoc. Load (xmlpath );

Xmlelement root = xmldoc. documentelement;

Xmlelement student = xmldoc. createelement ("student ");

Student. setattribute ("Number", strnumber );

Xmlelement name = xmldoc. createelement ("name ");

Name. innertext = strname;

Xmlelement sex = xmldoc. createelement ("sex ");

Sex. innertext = strsex;

Xmlelement age = xmldoc. createelement ("Age ");

Age. innertext = strage;

Student. appendchild (name );

Student. appendchild (sex );

Student. appendchild (AGE );

Root. appendchild (student );

Xmldoc. Save (xmlpath );

} 

From aboveCodeWe can see that

An XML operation is fully implemented in the form of Dom.

The key to understanding XML is Dom.