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You can leave one or the other of a property s accessors undefined by omitting its declaration. A property with only a get accessor is called a read-only property. A read-only property is a safe way of passing an item of data out from a class or class instance without allowing too much access. A property with only a set accessor is called a write-only property. A write-only property is a safe way of passing an item of data from outside of the class to the class without allowing too much access. At least one of the two accessors must be defined; otherwise, the compiler will produce an error message. Figure 6-10 illustrates read-only and write-only properties.

If we take a look at the Exception class (see http://msdn.microsoft.com/library/system .exception) we ll see that it has a Message property. That s what we re setting with the string we pass to the constructor, and it can be any text we like preferably something that will help us (or one of our clients) debug the problem in the future. There s also a property called Data. This is a dictionary of key/value pairs that lets us associate more information with the exception, and it can be extremely useful for debugging or logging purposes. Replacing the return value with an exception, we will need to perform a bit of surgery on our application to get it to compile. First, let s change the Turtle.RunFor method so that it no longer returns a value, and delete the TurtleError enumeration (see Example 6-12).

// Run the turtle for the specified duration public void RunFor(double duration) { if (LeftMotorState == MotorState.Stopped && RightMotorState == MotorState.Stopped) { // If we are at a full stop, nothing will happen return; } // The motors are both // then we just drive if ((LeftMotorState == RightMotorState == (LeftMotorState == RightMotorState == { Drive(duration); } // // // if running in the same direction MotorState.Running && MotorState.Running) || MotorState.Reversed && MotorState.Reversed))

{ }

The motors are running in opposite directions, so we don't move, we just rotate about the center of the rig ((LeftMotorState == MotorState.Running && RightMotorState == MotorState.Reversed) || (LeftMotorState == MotorState.Reversed && RightMotorState == MotorState.Running)) Rotate(duration);

In most of the examples so far, the property has been associated with a field, and the get and set accessors have referenced that field. However, a property does not have to be associated with a field. In the following example, the get accessor computes the return value. In the following example code, class RightTriangle represents, not surprisingly, a right triangle. It has two public fields that represent the lengths of the two right-angle sides of the triangle. These fields can be written to and read from. The third side is represented by property Hypotenuse, which is a read-only property whose return value is based on the lengths of the other two sides. It is not stored in a field. Instead, it computes the correct value, on demand, for the current values of A and B. Figure 6-11 illustrates read-only property Hypotenuse. class RightTriangle { public double A = 3; public double B = 4; public double Hypotenuse { get{ return Math.Sqrt((A*A)+(B*B)); } } }

}

Then, we can update the calling program, and strip out the code that deals with the return value (see Example 6-13).

static void Main(string[] args) { Turtle arthurTheTurtle = new Turtle { PlatformWidth = 0.0, PlatformHeight = 10.0, MotorSpeed = 5.0 }; ShowPosition(arthurTheTurtle); // We want to proceed forwards arthurTheTurtle.LeftMotorState = MotorState.Running; arthurTheTurtle.RightMotorState = MotorState.Running; // For two seconds arthurTheTurtle.RunFor(2.0); ShowPosition(arthurTheTurtle); // Now, let's rotate clockwise for a bit arthurTheTurtle.RightMotorState = MotorState.Reversed; // PI / 2 seconds should do the trick arthurTheTurtle.RunFor(Math.PI / 2.0); ShowPosition(arthurTheTurtle); // And let's go into reverse arthurTheTurtle.RightMotorState = MotorState.Reversed; arthurTheTurtle.LeftMotorState = MotorState.Reversed; // And run for 5 seconds arthurTheTurtle.RunFor(5); ShowPosition(arthurTheTurtle); // Then rotate back the other way arthurTheTurtle.RightMotorState = MotorState.Running; // And run for PI/4 seconds to give us 45 degrees arthurTheTurtle.RunFor(Math.PI / 4.0); ShowPosition(arthurTheTurtle); // And finally drive backwards for a bit arthurTheTurtle.RightMotorState = MotorState.Reversed; arthurTheTurtle.LeftMotorState = MotorState.Reversed; arthurTheTurtle.RunFor(Math.Cos(Math.PI / 4.0)); ShowPosition(arthurTheTurtle); } Console.ReadKey();

[1, 2, 3, 5, 7]

OK, what happens if you compile and run (make sure you press F5 or choose Debug Start Debugging so that you run in the debugger) Well, you drop very rapidly into the debugger, as you can see in Figure 6-3.

class Program { static void Main() { RightTriangle c = new RightTriangle(); Console.WriteLine("Hypotenuse: {0}", c.Hypotenuse); } }

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