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PART I
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The Creation of C#
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While Java successfully addresses many of the issues surrounding portability in the Internet environment, there are still features that it lacks One is cross-language interoperability, also called mixed-language programming This is the ability for the code produced by one language to work easily with the code produced by another Cross-language interoperability is needed for the creation of large, distributed software systems It is also desirable for programming
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Part I:
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software components because the most valuable component is one that can be used by the widest variety of computer languages, in the greatest number of operating environments Another feature lacking in Java is full integration with the Windows platform Although Java programs can be executed in a Windows environment (assuming that the Java Virtual Machine has been installed), Java and Windows are not closely coupled Since Windows is the mostly widely used operating system in the world, lack of direct support for Windows is a drawback to Java To answer these and other needs, Microsoft developed C# C# was created at Microsoft late in the 1990s and was part of Microsoft s overall NET strategy It was first released in its alpha version in the middle of 2000 C# s chief architect was Anders Hejlsberg Hejlsberg is one of the world s leading language experts, with several notable accomplishments to his credit For example, in the 1980s he was the original author of the highly successful and influential Turbo Pascal, whose streamlined implementation set the standard for all future compilers C# is directly related to C, C++, and Java This is not by accident These are three of the most widely used and most widely liked programming languages in the world Furthermore, at the time of C# s creation, nearly all professional programmers knew C, C++, and/or Java By building C# upon a solid, well-understood foundation, C# offered an easy migration path from these languages Since it was neither necessary nor desirable for Hejlsberg to reinvent the wheel, he was free to focus on specific improvements and innovations The family tree for C# is shown in Figure 1-1 The grandfather of C# is C From C, C# derives its syntax, many of its keywords, and its operators C# builds upon and improves the object model defined by C++ If you know C or C++, then you will feel at home with C# C# and Java have a bit more complicated relationship As explained, Java is also descended from C and C++ It too shares the C/C++ syntax and object model Like Java, C# is designed to produce portable code However, C# is not descended from Java Instead, C# and Java are more like cousins, sharing a common ancestry, but differing in many important ways The good news, though, is that if you know Java, then many C# concepts will be familiar Conversely, if in the future you need to learn Java, then many of the things you learn about C# will carry over
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FIGURE 1-1 The C# family tree
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1:
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The Creation of C#
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C# contains many innovative features that we will examine at length throughout the course of this book, but some of its most important relate to its built-in support for software components In fact, C# has been characterized as being a component-oriented language because it contains integral support for the writing of software components For example, C# includes features that directly support the constituents of components, such as properties, methods, and events However, C# s ability to work in a secure, mixed-language environment is perhaps its most important component-oriented feature
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PART I
The Evolution of C#
Since its original 10 release, C# has been evolving at a rapid pace Not long after C# 10, Microsoft released version 11 It contained many minor tweaks but added no major features However, the situation was much different with the release of C# 20 C# 20 was a watershed event in the lifecycle of C# because it added many new features, such as generics, partial types, and anonymous methods, that fundamentally expanded the scope, power, and range of the language Version 20 firmly put C# at the forefront of computer language development It also demonstrated Microsoft s long-term commitment to the language The next major release of C# was 30 Because of the many new features added by C# 20, one might have expected the development of C# to slow a bit, just to let programmers catch up, but this was not the case With the release of C# 30, Microsoft once again put C# on the cutting edge of language design, this time adding a set of innovative features that redefined the programming landscape These include lambda expressions, languageintegrated query (LINQ), extension methods, and implicitly typed variables, among others Although all of the new 30 features were important, the two that had the most high-profile impact on the language were LINQ and lambda expressions They added a completely new dimension to C# and further emphasized its lead in the ongoing evolution of computer languages The current release is C# 40, and that is the version of C# described by this book C# 40 builds on the strong foundation established by the previous three major releases, adding several new features Perhaps the most important are named and optional arguments Named arguments let you link an argument with a parameter by name Optional arguments give you a way to specify a default argument for a parameter Another important new feature is the dynamic type, which is used to declare objects that are type-checked at runtime, rather than compile time Covariance and contravariance support is also provided for type parameters, which are supported by new uses of the in and out keywords For those programmers using the Office Automation APIs (and COM in general), access has been simplified (Office Automation and COM are outside the scope of this book) In general, the new 40 features further streamline coding and improve the usability of C# There is another major feature that relates directly to C# 40 programming, but which is provided by the NET Framework 40 This is support for parallel programming through two major new features The first is the Task Parallel Library (TPL) and the second is Parallel LINQ (PLINQ) Both of these dramatically enhance and simplify the process of creating programs that use concurrency Both also make it easier to create multithreaded code that automatically scales to utilize the number of processors available in the computer Put directly, multicore computers are becoming commonplace, and the ability to parallelize your code to take advantage of them is an increasingly important part of nearly every C# programmer s job description Because of the significant impact the TPL and PLINQ are having on programming, both are covered in this book
Part I:
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