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// Calling a more interesting custom constructor with init syntax



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[book] [en] Pro C# 2008 and the NET 3.5 Platform Fourth Edition

// Calling a more interesting custom constructor with init syntax.

Point goldPoint = new Point(PointColor.Gold){ X = 90, Y = 20 };

Console.WriteLine("Value of Point is: {0}", goldPoint);

Initializing Inner Types

Recall from Chapter 6 that the “has-a” relationship allows us to compose new types by defining

member variables of existing types. For example, assume we now have a Rectangle class, which

makes use of the Point type to represent its upper-left/bottom-right coordinates:

public class Rectangle

{

private Point topLeft = new Point();



private Point bottomRight = new Point();

public Point TopLeft

{

get { return topLeft; }



set { topLeft = value; }

}

public Point BottomRight



{

C H A P T E R   1 3  



C #   2 0 0 8   L A N G U A G E   F E AT U R E S



438

8849CH13.qxd  10/2/07  12:42 PM  Page 438




get { return bottomRight; }

set { bottomRight = value; }

}

public override string ToString()



{

return string.Format("[TopLeft: {0}, {1}, BottomRight: {2}, {3}]", topLeft.X,

topLeft.Y, bottomRight.X, bottomRight.Y);

}

}



Using object initialization syntax, we could create a new Rectangle type and set the inner

Points as follows:




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