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An object browser is an example of a program that displays metadata. It can read assemblies and display the types they contain, along with all the characteristics and members. This chapter will look at how your programs can reflect on data using the Type class and how you can add metadata to your types using attributes.

Lifetime value can at rst be computed for all customers as a group, but once it has been developed, it should be determined for customer segments. The LTV of an individual customer is derived from the LTV of the segment that includes that customer, adjusted for the products the customer owns and other factors that seem to determine the customer s particular LTV. Lifetime value produces numbers that can eventually be audited after the fact. A year later, you can go back and see what the retention (repurchase) rate was; what the spending rate was; what the marketing expenditures, the pro ts, and the discount rate were. It is not smoke and mirrors.

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Throughout this text I ve described how to declare and use the types available in C#. These include the predefined types (int, long, string, and so on), types from the BCL (Console, IEnumerable, and so on), and user-defined types (MyClass, MyDel, and so on). Every type has its own members and characteristics. The BCL declares an abstract class called Type, which is designed to contain the characteristics of a type. Using objects of this class allows you to get information about the types your program is using. Since Type is an abstract class, it cannot have actual instances. Instead, at run time, the CLR creates instances of a class derived from Type (RuntimeType) that contains the type information. When you access one of these instances, the CLR returns a reference, not of the derived type but of the base class Type. For simplicity s sake, though, throughout the rest of the chapter, I ll call the object pointed at by the reference an object of type Type, although technically it s an object of a derived type that is internal to the BCL. Important things to know about Type are the following: For every type used in a program, the CLR creates a Type object that contains the information about the type. Every type used in a program is associated with a separate Type object. Regardless of the number of instances of a type that are created, there is only a single Type object associated with all the instances.

Figure 24-1 shows a running program with two MyClass objects and an OtherClass object. Notice that although there are two instances of MyClass, there is only a single Type object representing it.

Computing LTV using complex formulas that your top management does not understand. If your management doesn t understand exactly how you developed it, it will have no con dence in it and will not use it pro tably. Looking at LTV numbers by themselves. An LTV number by itself is meaningless. Its most important use is in calculating whether proposed marketing programs will increase or decrease lifetime value. Spending resources on getting an exact lifetime value number. LTV is a future number. The future has so many unknown factors that you should use LTV as a rough guide: Do this, and don t do that. That is all it is good for.

Figure 24-1. The CLR instantiates objects of type Type for every type used in a program. You can get almost anything you need to know about a type from its Type object. Table 24-1 lists some of the more useful members of the class. Table 24-1. Selected Members of Class System.Type

Returns the name of the type. Returns the namespace containing the type declaration. Returns the assembly in which the type is declared. If the type is generic, it returns the assembly in which the type is defined. Returns a list of the type s fields. Returns a list of the type s properties. Returns a list of the type s methods.

What remains is the technique definition: technique Mirror { pass Pass0 { VertexShader = compile vs_1_1 MirrorVS(); PixelShader = compile ps_2_0 MirrorPS(); } }

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