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The Data Property

The Data property of System.Exception allows you to fill an exception object with relevant auxiliary

information (such as a time stamp or what have you). The Data property returns an object imple-

menting an interface named IDictionary, defined in the System.Collections namespace. Chapter 9

examines the role of interface-based programming as well as the System.Collections namespace.

For the time being, just understand that dictionary collections allow you to create a set of values

that are retrieved using a specific key. Observe the next update to the Car.Accelerate() method:

public void Accelerate(int delta)

{

if (carIsDead)

Console.WriteLine("{0} is out of order...", petName);

else

{

currSpeed += delta;

if (currSpeed >= MaxSpeed)

{

carIsDead = true;

currSpeed = 0;

// We need to call the HelpLink property, thus we need

// to create a local variable before throwing the Exception object.

Exception ex =

new Exception(string.Format("{0} has overheated!", petName));

ex.HelpLink = "http://www.CarsRUs.com";