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In addition to the CLR and CTS/CLS specifications, the .NET platform provides a base class library that is available to all .NET programming languages. Not only does this base class library encapsulate various primitives such as threads, file input/output (I/O), graphical rendering systems, and interaction with various external hardware devices, but it also provides support for a number of services required by most real-world applications. For example, the base class libraries define types that facilitate database access, manipulation of XML documents, programmatic security, and the construction of web-enabled as well as traditional desktop and console-based front ends. From a high level, you can visualize the relationship between the CLR, CTS, CLS, and the base class library, as shown in Figure 1-1.

Given that .NET is such a radical departure from previous technologies, Microsoft crafted a new programming language, C#, specifically for this platform. C# is a programming language whose core syntax looks very similar to the syntax of Java. However, to call C# a Java rip-off is inaccurate. Both C# and Java are members of the C family of programming languages (e.g., C, Objective C, C++) and therefore share a similar syntax. The truth of the matter is that many of C# s syntactic constructs are modeled after various aspects of Visual Basic 6.0 and C++. For example, like VB6, C# supports the notion of formal type properties (as opposed to traditional getter and setter methods) and the ability to declare methods taking a varying

$this->assertFalse($result, $message = % , $group = Other )

number of arguments (via parameter arrays). Like C++, C# allows you to overload operators, as well as create structures, enumerations, and callback functions (via delegates). Moreover, as you work through this text, you will quickly see that C# supports a number of features traditionally found in various functional languages (e.g., LISP or Haskell) such as lambda expressions and anonymous types. Furthermore, with the advent of LINQ (Language Integrated Query), C# supports a number of constructs that make it quite unique in the programming landscape. Nevertheless, the bulk of C# is indeed influenced by C-based languages. Due to the fact that C# is a hybrid of numerous languages, the result is a product that is as syntactically clean if not cleaner as Java, is about as simple as VB6, and provides just about as much power and flexibility as C++ (without the associated ugly bits). Here is a partial list of core C# features that are found in all versions of the language. No pointers required! C# programs typically have no need for direct pointer manipulation (although you are free to drop down to that level if absolutely necessary, as shown in 12). Automatic memory management through garbage collection. Given this, C# does not support a delete keyword. Formal syntactic constructs for classes, interfaces, structures, enumerations, and delegates. The C++-like ability to overload operators for a custom type, without the complexity (e.g., making sure to return *this to allow chaining is not your problem). Support for attribute-based programming. This brand of development allows you to annotate types and their members to further qualify their behavior.

With the release of .NET 2.0 (circa 2005), the C# programming language was updated to support numerous new bells and whistles, most notability the following: The ability to build generic types and generic members. Using generics, you are able to build very efficient and type-safe code that defines numerous placeholders specified at the time you interact with the generic item. Support for anonymous methods, which allow you to supply an inline function anywhere a delegate type is required. Numerous simplifications to the delegate/event model, including covariance, contravariance, and method group conversion. (If some of these terms are unfamiliar, fear not. You ll learn about such details over the course of the book.) The ability to define a single type across multiple code files (or if necessary, as an in-memory representation) using the partial keyword.

This function asserts that the variable $result resolves to false. $foo = is_valid( foo ); $this->assertFalse($valid, t( Make sure that the foo is not a valid variable));

.NET 3.5 (released circa 2008) added even more functionality to the C# programming language, including the following features: Support for strongly typed queries (e.g., LINQ) used to interact with various forms of data. Support for anonymous types that allow you to model the shape of a type rather than its behavior.