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his chapter examines one of C# s most sophisticated and powerful features: generics Interestingly, although generics are now an indispensable part of C# programming, they were not included in the original 10 release Instead, they were added by C# 20 It is not an overstatement to say that the addition of generics fundamentally changed the character of C# Not only did it add a new syntactic element, it also added new capabilities and resulted in many changes and upgrades to the library Although it has been a few years since the inclusion of generics in C#, the effects still reverberate throughout the language The generics feature is so important because it enables the creation of classes, structures, interfaces, methods, and delegates that work in a type-safe manner with various kinds of data As you may know, many algorithms are logically the same no matter what type of data they are being applied to For example, the mechanism that supports a queue is the same whether the queue is storing items of type int, string, object, or a user-defined class Prior to generics, you might have created several different versions of the same algorithm to handle different types of data Through the use of generics, you can define a solution once, independently of any specific type of data, and then apply that solution to a wide variety of data types without any additional effort This chapter describes the syntax, theory, and use of generics It also shows how generics provide type safety for some previously difficult cases Once you have completed this chapter, you will want to examine 25, which covers Collections There you will find many examples of generics at work in the generic collection classes

At its core, the term generics means parameterized types Parameterized types are important because they enable you to create classes, structures, interfaces, methods, and delegates in which the type of data upon which they operate is specified as a parameter Using generics, it is possible to create a single class, for example, that automatically works with different types of data A class, structure, interface, method, or delegate that operates on a parameterized type is called generic, as in generic class or generic method It is important to understand that C# has always given you the ability to create generalized code by operating through references of type object Because object is the base class of all other classes, an object reference can refer to any type of object Thus, in pre-generics code, generalized code used object references to operate on a variety of different kinds of objects

2 Suggest that they look at combining categories to see if we can eliminate duplications and redundancies By identifying the main categories and forcing myself to ll in the blanks, I was able to generate ideas For example, the idea of combining categories to avoid duplications and redundancies I think that s a really good idea, and it only came to me because I needed a No 2 to follow my No 1 In the end, the E-mail just about wrote itself (See Figure 21)

Part I:

d cot x = (csc x)2 dx d sec x = sec x tan x 5 dx d csc x = csc x cot x 6 dx 4 C Derivatives of lnx and ex : We conclude our library of derivatives of basic functions with d x e = ex dx and 1 d ln x = dx x We may apply the Chain Rule to obtain the following particularly useful generalization of this logarithmic derivative: (x) d ln (x) = dx (x) Now it is time to learn to differentiate the functions that we will commonly encounter in our work We do so by applying the rules for sums, products, quotients, and compositions to the formulas for the derivatives of the elementary functions Practice is the essential tool in mastery of these ideas Be sure to do all the You Try It problems in this section

The problem was that it could not do so with type safety because casts were needed to convert between the object type and the actual type of the data This was a potential source of errors because it was possible to accidentally use an incorrect cast Generics avoid this problem by providing the type safety that was lacking Generics also streamline the process because it is no longer necessary to employ casts to translate between object and the type of data that is actually being operated upon Thus, generics expand your ability to re-use code, and let you do so safely and easily

in C++ and generics in Java, they are not the same as either In fact, there are some fundamental differences among these three approaches to generics If you have a background in C++ or Java, it is important to not jump to conclusions about how generics work in C#

Let s begin with a simple example of a generic class The following program defines two classes The first is the generic class Gen, and the second is GenericsDemo, which uses Gen