C# 4 and .NET 4

952 ❘ ChaPTer 33 mAnipulAtinG xml
The Tragedy of Hamlet, Prince of Denmark
Dramatis Personae
CLAUDIUS, king of Denmark.
HAMLET, son to the late king,
and nephew to the present king.
POLONIUS, lord chamberlain.
HORATIO, friend to Hamlet.
LAERTES, son to Polonius.
LUCIANUS, nephew to the king.
Now look at this C# query:
XDocument xdoc = XDocument.Load(@"C:\hamlet.xml");
Console.WriteLine(
xdoc.Element("PLAY").Element("PERSONAE").Element("PERSONA").Value);
This bit of code starts at , works down to the element, and then makes use of the
element. However, using this will produce the following results:
CLAUDIUS, king of Denmark
The reason for this is that although there is a collection of elements, you are dealing only with
the first one that is encountered using the Element().Value call.
Writing to an Xml document
In addition to reading from an XML document, you can write to the document just as easily. For instance, if
you wanted to change the name of the first player of the Hamlet play file, you could use the following code:
using System;
using System.Linq;
using System.Xml.Linq;
namespace ConsoleApplication1
{
class Class1
{
static void Main()
{
XDocument xdoc = XDocument.Load(@"C:\hamlet.xml");
xdoc.Element("PLAY").Element("PERSONAE").
Element("PERSONA").SetValue("Bill Evjen, king of Denmark");
Console.WriteLine(xdoc.Element("PLAY").
Element("PERSONAE").Element("PERSONA").Value);
}
}
}
Console.ReadLine();
code download ConsoleApplication1.sln
www.it-ebooks.info