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But when exactly do static constructors run We know when regular members get initialized and when normal constructors run that happens when we new up the object. Everything gets initialized to zero, and then our constructor(s) are called to do any other initialization that we need doing. But what about static initialization The static constructor will run no later than the first time either of the following happens: you create an instance of the class; you use any static member of the class. There are no guarantees about the exact moment the code will run it s possible you ll see them running earlier than you would have expected for optimization reasons. Field initializers for static fields add some slight complication. (Remember, a field initializer is an expression that provides a default value for a field, and which appears in the field declaration itself, rather than the constructor. Example 3-44 shows some examples.) .NET initializes the statics in the order in which they are declared. So, if you

What you are going to do next is get the Popfly SDK block test harness up and running within Visual Web Developer (VWD). In order to do that, we have to create a new web site project in VWD. Select File New Web Site (see Figure 8-11).

reference one static field from the initializer for another static field in the same class, you need to be careful, or you can get errors at runtime. Example 3-44 illustrates how this can go wrong. (Also, the .NET Framework is somewhat noncommittal about exactly when field initializers will run in theory it has more freedom than with a static constructor, and could run them either later or earlier than you might expect, although in practice, it s not something you d normally need to worry about unless you re writing multithreaded code that depends on the order in which static initialization occurs.)

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class Bar { public bool myField; } // Bad - null reference exception on construction class Foo { public static bool field2 = field1.myField; public static Bar field1 = new Bar(); } // OK - initialized in the right order class Foo { public static Bar field1 = new Bar(); public static bool field2 = field1.myField; }

Summary

He wants to respond to Alice and say, I think you are the love of my life, but he s interested in other women as well Carol may also respond to Bob s personal ad, and Bob may not know which woman he loves more He might want to tell both of these women that he loves them, yet he may not want Alice to know that he tells Carol that she is the love of his life, and vice versa We could try to use symmetric key cryptography to enable confidential communication between Alice and Bob, and Carol and Bob If Bob publishes a symmetric key in an online directory, then anyone who has access to that directory has access to that key With the key, someone can decode any messages encrypted with that key regardless of who encrypted it.

We saw how to define classes from which we can create instances called objects, and that this can be useful when attempting to model real-world entities. We can also define value types, using the struct keyword, and the main difference is that when we assign variables or pass arguments, value types always copy the whole value, whereas ordinary classes (which are reference types) only copy a reference to the underlying object. We also saw a simpler kind of type: enum. This lets us define named sets of constant values, and is useful when we need a value representing a choice from a fixed set of options. So, now we know how to abstract basic ideas of information storage (through fields and simple properties) and manipulation (through functions and calculated properties), using classes and objects. In the next chapter, we re going to look at how we can extend these ideas further using a concept called polymorphism to model a hierarchy of related classes that can extend or refine some basic contract.

In the previous chapter, we saw how to define various types of classes and specify their members fields, properties, and functions. In this chapter, we re going to start by looking at this again in more detail, and try to understand what underlying concepts we re implementing when we use these different coding patterns. We ll then introduce a couple of new concepts inheritance and polymorphism and the language features that help us implement them. We ve finished our ATC application, by the way. Having gotten a reputation for building robust mission-critical software on time and to spec, we ve now been retained by the fire department to produce a training and simulation system for them. Example 4-1 shows what we have so far.

class Firefighter { public string Name { get; set; } public void ExtinguishFire() { Console.WriteLine("{0} is putting out the fire!", Name); } public void Drive(Firetruck truckToDrive, Point coordinates) { if (truckToDrive.Driver != this) { // We can't drive the truck if we're not the driver // But just silently failing is BADBAD // What we need is some kind of structured means // of telling the client about the failure // We'll get to that in 6 return; } truckToDrive.Drive(coordinates); }

} class Firetruck { public Firefighter Driver { get; set; } public void Drive(Point coordinates) { if (Driver == null) { // We can't drive if there's no driver return; } } Console.WriteLine("Driving to {0}", coordinates);

}

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