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Errors happen all the time; they re a fact of life: Despite the best efforts of Microsoft Word, an army of highly skilled reviewers and editors, and even your authors, it would be surprising if there wasn t a typographical error in a book of this length. Although they are relatively few and far between, there are bugs in the .NET Framework hence the need for occasional service packs. You might type your credit card number for an online transaction and accidentally transpose two digits; or forget to type in the expiration date. Like it or not, we re going to have to face up to the fact that there are going to be errors of all kinds to deal with in our software too. In this chapter, we ll look at various types of errors, the tools that C# and the .NET Framework give us to deal with them, and some strategies for applying those tools. First, we need to recognize that all errors are not made the same. We ve classified a few of the more common ones in Table 6-1.

This will save rules that are currently active in the kernel to the file /etc/sysconfig/iptables It will overwrite the current contents of the file, so this method is only useful if you do not edit the configuration file manually The command service iptables invokes the iptables initialization (init) script This script is automatically run during system startup and shutdown It is possible to tune some of the actions that this script performs by editing another configuration file, called /etc/sysconfig/iptables config Of interest here are the variables IPTABLES_SAVE_ON_STOP and IPTABLES_SAVE_ON_RESTART If you set IPTABLES_SAVE_ON_STOP=yes, then any time you use the command service iptables stop or shut down or reboot the system, your current iptables rules will be saved If you set IPTABLES_SAVE_ON_RESTART=yes, then any time you use the command service iptables restart, your current iptables rules will be saved.

Without this parameter, when you compile the code later, the required properties would generate an error stating no value was provided Next, you must define the property s Get and Set statements, and you can add attributes as well One attribute is ValidationOption This attribute defines whether the property should be validated at compile time You can use the DescriptionAttribute to provide a description when the user puts the mouse over the property s name within the property window The structure for a property is as follows: <DesignerSerializationVisibilityAttribute _ (DesignerSerializationVisibilityVisible)> _ <ValidationOption(ValidationOptionRequired)> _ <BrowsableAttribute(True)> _.

Table 6-1. A far-from-exhaustive list of some common errors Error Bug Unexpected behavior Unexpected input Unexpected data type Unexpected data format Unexpected result Unexpected method call Unavailable resource Description/example A failure to implement a contract according to its documentation. A failure to document a contract properly for all expected input. A client passes data to a method that is outside some expected range. 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. 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 was not present a hardware device was not plugged in, for instance.

Description/example 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.

Although bugs are probably the most obvious type of error, we won t actually be dealing with them directly in this chapter. We will, however, look at how our error-handling techniques can make it easier (or harder!) to find the bugs that are often the cause of the other, better defined issues. Let s get started with an example we can use to look at error-handling techniques. We re going to branch out into the world of robotics for this one, and build a turtle-controlling application. The real-world turtle is a rectangular piece of board on which are mounted two motors that can drive two wheels. The wheels are located in the middle of the left and right edges of the board, and there are nondriven castor wheels at the front and back to give it a bit of stability. We can drive the two motors independently: we can move forward, move backward, or stop. And by moving the wheels in different directions, or moving one wheel at time, we can steer it about a bit like a tank. Let s create a class to model our turtle (see Example 6-1).