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One important question remains: how did we know what exception type to catch from our code Unlike some other languages (e.g., Java) there is no keyword which allows us to specify that a method can throw a particular exception. We have to rely on good developer documentation. The MSDN documentation for the framework itself carefully documents all the exceptions that can be thrown from its methods (and properties), and we should endeavor to do the same. The .NET Framework provides a wide variety of exception types that you can catch (and often use). Let s revisit Table 6-1 (the common error types) and see what is available for those situations (see Table 6-2).

Table 6-2. Some common errors and their exception types Error Unexpected input Description A client passes data to a method that is outside some expected range. Examples

Unexpected data type Unexpected data format Unexpected result Unexpected method call Unavailable resource Contended resource

2. For example, ICMP-based smurf attacks can be prevented by configuring the firewall to drop ICMP ping requests sent to broadcast network addresses.

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A client passes data to a method that is not of the expected type. A client passes data to a method in a format that is not recognized. A client receives information from a method that it did not expect for the given input (e.g., null). The class wasn t expecting you to call a particular method at that time; you hadn t performed some required initialization, for example. A method tried to access a resource of some kind and it failed to respond in a timely fashion; a hardware device was not plugged in, for instance. A method tried to access a scarce resource of some kind (memory or a hardware device that cannot be shared) and it was not available because someone else was using it.

Obviously, that s a much abbreviated list, but it contains some of the most common exceptions you ll see in real applications. One of the most useful that you ll throw yourself is the ArgumentException. You can use that when parameters passed to your methods fail to validate. Let s make use of that in our RunFor method. Say that a feature of our turtle hardware is that it crashes and becomes unresponsive if we try to run it for zero seconds. We can work around this in our software by checking for this condition in the RunFor method, and throwing an exception if clients try this, as shown in Example 6-21.

public void RunFor(double duration) { if (duration <= double.Epsilon) { throw new ArgumentException( "Must provide a duration greater than 0", "duration"); } try { // ... } catch (InvalidOperationException iox)

{

}

Additional relevant security techniques have also been added to the appropriate cells of Table A-1 to show that a wide variety of techniques fit well within the context of the FLI framework. At the same time, we realize that the cells in Table A-1 do not have absolutely precise boundaries, and it is sometimes arguable as to whether a given security problem or solution fits into one cell or another, or may even span across multiple cells. However, we find the FLI framework useful to conceptually organize the space of threats and countermeasures.

throw new Exception("Some problem with the turtle has occurred", iox); } catch (Exception ex) { // Log here Console.WriteLine("Log error: " + ex.Message); // Rethrow throw; } finally { Console.WriteLine("In the Turtle finally block"); }

The second parameter in this constructor should match the name of the parameter that is in error. The first represents the exception message.

The componentManager operation add is called with t for the variable and TechnoratiClass as the name of the JavaScript object to be created for the block. The first code of the block is an empty constructor:

When you come to use ArgumentNullException (which you throw when you are erroneously passed a null argument) you ll find that the error message and parameter arguments are swapped around in the constructor. This irritating inconsistency has been with us since .NET 1.0, and too much code depends on it to fix it now.

static void Main(string[] args) { Turtle arthurTheTurtle = new Turtle { PlatformWidth = 0.0, PlatformHeight = 10.0, MotorSpeed = 5.0 }; ShowPosition(arthurTheTurtle); try {

In our description of the FLI model using Table A-1, the threats, or possible attacks, make up the columns of the table; and prevention, detection, containment, and recovery make up the rows Inside the cells of the table are defense mechanisms that can be employed While the description of the threats in Table A-1 is fairly generic, you can apply a FLI-like model to your particular application by writing out the threats as the columns For instance, let s say that you run an e-commerce site with a database back end that allows users to log in with a username and password Some threats that you might be interested in defending against are phishing, dictionary attacks, and SQL injection these would make up the columns of your table.

arthurTheTurtle.RunFor(0.0); // ... } catch (InvalidOperationException e) { Console.WriteLine("Error running turtle:"); Console.WriteLine(e.Message); } catch (Exception e1) { // Loop through the inner exceptions, printing their messages Exception current = e1; while (current != null)

{

}

} } finally { Console.WriteLine("Waiting in the finally block"); Console.ReadKey(); }

Console.WriteLine(current.Message); current = current.InnerException;

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