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You should consider very carefully whether you want to catch instances of the base Exception type. When you do that you are saying something bad happened, but I don t really know what it was. That degree of uncertainty tends to imply that the app has lost control of its own internal consistency. It is a common practice to catch Exception in your top-level exception handlers (e.g., in Main or, as we ll see later, in threading worker functions); and when you do, you normally need to terminate the application (or at least restart some subsystem). Of course, you might know perfectly well what might go wrong, and you re catching Exception because you can t be bothered to list the half dozen exception types you intend to handle in the same way. (Maybe F1 wasn t working so well that day and you couldn t inspect the docs; and someone was pressing you to check in your changes.) Beware! What happens if an implementation detail changes in another class on which you depend, such that a new exception is thrown Your handler will swallow it up and carry on. That might be OK, and your game of tic-tac-toe will continue happily. Or it might have unintended consequences, such as data loss or the start of WWIII. You just can t know in advance.

When the flow of control leaves the try block successfully, or the flow of control exits the last catch block if an exception occurred in the try block, the code in the finally block is executed. In other words, the code in the finally block is always executed, regardless of whether there was an exception. If you designed your exception-handling code nicely, you ll almost certainly use far more finally blocks than you do catch blocks. The finally block is a good place for cleaning up your resources, or winding back internal state if an error occurs, to ensure that your pre- and post conditions are still valid, whereas a catch block allows you to deal with an error condition you, as a client, understand in some way even if it is only to present a message to the user (as in this case). If we compile and run our code again, we ll see the following output:

Arthur is at (0,0) and is pointing at angle 0.00 radians. Arthur is at (0,10) and is pointing at angle 0.00 radians. Error running turtle: The PlatformWidth must be initialized to a value > 0.0 Waiting in the finally block...

a.SoundOff(); b.SoundOff(); c.SoundOff(); } } This code produces the following output: MyName Nemo, MyNumber 28 MyName Nemo, MyNumber 7 MyName Bill, MyNumber 0

Notice how the error-handling code is now consolidated neatly into clearly defined blocks, rather than scattered throughout our code, and we ve been able to cut down substantially on the number of points of return from our method.

Note that you should enclose the JSON data in parentheses before calling eval. By doing this, you force eval to consider the argument an expression, and an object literal {} won t be interpreted as a code block. But the eval function can execute arbitrary code, which can lead to security issues if the data come from an untrusted source. For this reason, it s always recommended that you validate the JSON data before calling the eval function.

At the moment, we re not handling any exceptions in our Turtle itself. Let s imagine that our Turtle is being provided to clients in a library, and we (as the leading vendors of turtle simulators) want the library to do some internal logging when errors occur: maybe we have an opt-in customer experience program that sends telemetry back to our team. We still want the errors to propagate up to the client for them to deal with; we just want to see them on the way past. C# gives us the ability to catch, and then transparently rethrow, an exception, as shown in Example 6-17.

// Run the turtle for the specified duration public void RunFor(double duration) { try { 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))

{

If no instance constructor is explicitly supplied in the class declaration, then the compiler supplies an implicit, default constructor with No parameters An empty body If the programmer defines any constructor at all, then the compiler does not define any default constructors for the class. For example, Class2 declares two constructors. Because there is at least one explicitly defined constructor, the compiler does not create any additional constructors. In Main, there is an attempt to create a new instance using a constructor with no parameters. Since there is no constructor with zero parameters, the compiler will produce an error message. class Class2 { public Class2(int Value) { ... } public Class2(String Value) { ... } } class Program { static void Main() { Class2 a = new Class2(); ... } }

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);

} } catch (Exception ex) { Console.WriteLine("Log message: " + ex.Message); // Rethrow throw;

}

}

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