C # operating XML (non-LINQ Version)

<? XML version = "1.0" encoding = "UTF-8"?>
<Books>
<Book>
<Name> Harry Potter </Name>
<Price> 10 </price>
<Memo> This is a nice book. </Memo>
</Book>
<Book id = "B02">
<Name> Romance of the Three Kingdoms </Name>
<Price> 10 </price>
<Memo> one of the four famous books. </Memo>
</Book>
<Book id = "b03">
<Name> region </Name>
<Price> 6 </price>
<Memo> one of the four famous books. </Memo>
</Book>
<Book id = "b04">
<Name> redhouse </Name>
<Price> 5 </price>
<Memo> one of the four famous books. </Memo>
</Book>
</Books>

 

Using system;
Using system. Collections. Generic;
Using system. LINQ;
Using system. text;
Using system. xml;

 

Namespace xmltest
{
Class Program
{
Static void main (string [] ARGs)
{
Xmlelement thebook = NULL, theelem = NULL, root = NULL;
Xmldocument xmldoc = new xmldocument ();
Try
{
String url = appdomain. currentdomain. basedirectory + "XML/books. xml ";
Xmldoc. Load ("http://www.cnblogs.com/XML/Books.xml ");
Root = xmldoc. documentelement;

// --- Create a new book ----
Thebook = xmldoc. createelement ("book ");
Theelem = xmldoc. createelement ("name ");
Theelem. innertext = "new book ";
Thebook. appendchild (theelem );

Theelem = xmldoc. createelement ("price ");
Theelem. innertext = "20 ";
Thebook. appendchild (theelem );

Theelem = xmldoc. createelement ("memo ");
Theelem. innertext = "better book. ";
Thebook. appendchild (theelem );
Root. appendchild (thebook );
Console. Out. writeline ("--- create a new book ----");
Console. Out. writeline (root. outerxml );
// --- Create a new book ----

// --- Make some changes to Harry Potter. ----
// --- Query for Harry Potter ----
Thebook = (xmlelement) root. selectsinglenode ("/books/book [name = 'Harry Potter ']");
Console. Out. writeline ("--- find Harry Potter ----");
Console. Out. writeline (thebook. outerxml );
// --- Modify the price of this book at this time -----
Thebook. getelementsbytagname ("price"). Item (0). innertext = "15"; // getelementsbytagname returns nodelist, so keep up with item (0 ). In addition, getelementsbytagname ("price") is equivalent to selectnodes (". // price ").
Console. Out. writeline ("--- modify the price of this book at this time ----");
Console. Out. writeline (thebook. outerxml );
// --- You also want to add an attribute ID with the value B01 ----
Thebook. setattribute ("ID", "B01 ");
Console. Out. writeline ("--- you also want to add an attribute ID with the value B01 ----");
Console. Out. writeline (thebook. outerxml );
// --- Modify Harry Potter. ----

// --- Delete all books whose prices are less than 10 ----
Thebook = (xmlelement) root. selectsinglenode ("/books/book [@ ID = 'b02']");
Console. Out. writeline ("--- use the ID attribute to delete the book" Romance of Three Kingdoms ----");
Console. Out. writeline (thebook. outerxml );
Thebook. parentnode. removechild (thebook );
Console. Out. writeline ("--- XML after deletion ----");
Console. Out. writeline (xmldoc. outerxml );

// --- Delete all books whose prices are less than 10 ----
Xmlnodelist somebooks = root. selectnodes ("/books/book [price <10]");
Console. Out. writeline ("--- delete all books with prices lower than 10 ---");
Console. Out. writeline ("--- eligible books include" + somebooks. Count +. ---");

For (INT I = 0; I <somebooks. Count; I ++)
{
Somebooks. Item (I). parentnode. removechild (somebooks. Item (I ));
}
Console. Out. writeline ("--- XML after deletion ----");
Console. Out. writeline (xmldoc. outerxml );

Xmldoc. Save ("books. xml"); // save it to books. xml

Console. In. Read ();
Console. Readline ();
}
Catch (exception E)
{
Console. Out. writeline (E. Message );
}
}
}
}