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// A "lightweight" event handler.

partial void OnZipCodeLookup(string make);

}

If a class builder wishes to be informed when the CarAvailableInZipCode() method has been

called, they can provide an implementation of the OnZipCodeLookup() method. If they do not care,

they simply do nothing.

■

Source Code

The PartialMethods project can be found under the Chapter 13 subdirectory.

Understanding Object Initializer Syntax

C# 2008 offers a new way to hydrate the state of a new class or structure variable termed object ini-

tializer syntax. Using this technique, it is possible to create a new type variable and assign a slew of

properties and/or public fields in a few lines of code. Syntactically, an object initializer consists of a

comma-delimited list of specified values, enclosed by the { and } tokens. Each member in the ini-

tialization list maps to the name of a public field or public property of the object being initialized.

To see this new syntax in action, create a new Console Application named ObjectInitializers.

Now, consider the various geometric types created over the course of this text (Point, Rectangle,

Hexagon, etc.). For example, recall our simple Point type (which did not make use of C# 2008 auto-

matic properties):

public class Point

{

private int xPos, yPos;

public Point(int x, int y)

{

xPos = x; yPos = y; }

public Point(){}

public int X

{

get { return xPos; }

set { xPos = value; }

}

public int Y

{

get { return yPos; }

set { yPos = value; }

}

public override string ToString()

{ return string.Format("[{0}, {1}]", xPos, yPos); }

}

Under C# 2008, we could now make Points using any of the following approaches:

static void Main(string[] args)

{

Console.WriteLine("***** Fun with Object Init Syntax *****\n");