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Source Code

The CloneablePoint project is located under the Chapter 9 subdirectory.

Building Comparable Objects (IComparable)

The System.IComparable interface specifies a behavior that allows an object to be sorted based on

some specified key. Here is the formal definition:

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// This interface allows an object to specify its

// relationship between other like objects.

public interface IComparable

{

int CompareTo(object o);

}

Let’s assume you have a new Console Application named ComparableCar that defines the

following updated Car type (notice that we have basically just added a new member variable to

represent a unique ID for each car as well as ways to get and set the value):

public class Car

{

...

private int carID;

public int ID

{

get { return carID; }

set { carID = value; }

}

public Car(string name, int currSp, int id)

{

currSpeed = currSp;

petName = name;

carID = id;

}

...

}

Now assume you have an array of Car types as follows:

static void Main(string[] args)

{

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