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Well done, Bill; all that training came in handy, exactly as we d expect. Although it works, you ll notice that we ve duplicated some code from our base class into our derived class the bit that actually does the work in each of those methods. It would be better if we could just call on our base class implementation to do the job for us. As you d expect, C# has this in hand, with the base keyword.

If we ever want to call on the implementation of a member in our base class (bypassing any of our own overrides), we can do so through the special base name:

base.CallOnTheBase();

Using that, we can reimplement our TraineeFirefighter and remove that duplicate code, as shown in Example 4-12.

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At a first glance, preventing XSS appears fairly straightforward We have to ensure that our application never sends any untrusted data to the user s browser such that this data could cause execution of script in the browser Usually, this can be done by either suppressing certain characters (such as the characters < and > that delimit HTML tags), or replacing them with an appropriate escape sequence (such as < and >) Unfortunately, the solution is not as simple as just escaping <, >, and "; there are a multitude of situations and contexts in which a string could be interpreted by the browser in a way that causes execution of script In the following, we examine each such context in turn, and then also cover a number of special situations.

class TraineeFirefighter : Firefighter { private bool hoseTrainedOnFire; protected override void TurnOnHose() { if (hoseTrainedOnFire) { // Call on the base implementation base.TurnOnHose(); } else { Console.WriteLine("There's water going everywhere!"); } } protected override void TrainHoseOnFire() { hoseTrainedOnFire = true; base.TrainHoseOnFire(); }

}

You ve just successfully run the test harness. The harness will be a central place for you to test your blocks. But now, it s time for you to further understand how the harness works and how to configure it to work with your blocks.

So, what happens if in a later version we change the implementation of the Extinguish Fire method on the base class Maybe we found an optimization that means it is faster to implement it like this:

public virtual void ExtinguishFire() { Console.WriteLine("{0} is putting out the fire!", Name); // We've swapped these around TurnOnHose(); TrainHoseOnFire(); }

Let s imagine that this Firefighter class is being implemented by one of our colleagues. She tested the new implementation against her Firefighter unit test suite, exactly as required, and everything passed just fine fires were extinguished. Then she handed it over to us to use (with our new TraineeFirefighter class that we re working on). If we compile and run, we get the following output:

Most situations in which a particular string could cause script execution involve placement into a specific context within an HTML document We give examples for these contexts in the form of HTML snippets with variable substitution placeholders such as %(variable)s (this syntax will be familiar to Python programmers) We refer to HTML snippets containing such placeholders as HTML template snippets For example, the HTML template snippet <title>Example document: %(title)s</title> is intended to illustrate a template snippet that results in the following HTML to be emitted to the browser if the variable title has value Cross-Site Scripting: <title>Example document: Cross-Site Scripting</title> We chose this syntax to keep the examples independent from any particular templating or HTML rendering infrastructure; the equivalent notation for the preceding would be < = title > in PHP and <%=title %> in ASP or JSP The examples in this document are based on JavaScript.

Joe is putting out the fire! Training the hose on the fire. The fire is going out. Bill is putting out the fire! There's water going everywhere! Training the hose on the fire.

So the Firefighter code works fine, just as our colleague promised; but our Trainee Firefighter has made a bit of a mess. This is a shame, as he has not done anything different we didn t change a single line of our TraineeFirefighter code that was working just a moment earlier. The problem is that, while our documentation for ExtinguishFire told us that it would call both of those virtual methods it didn t promise to do so in any particular order. And there was no documentation at all on our protected virtual methods to tell us how we should override them, or whether there were any particular constraints or invariants we should maintain.

This is a very common combination of problems when designing an inheritance hierarchy poor documentation on the base class, and insufficiently defensive implementations in a derived class. Creating a class hierarchy is not an easy thing to do. And this is when we re only making selected methods virtual imagine the chaos if all methods were virtual by default! In the next chapter, we re going to look at some alternative ways to vary behavior that are more easily documented and potentially more robust than deriving from a base class. That s not to say that you shouldn t make use of such a powerful concept as polymorphism; it is just that you should take care when you do so.

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