By Eric Gunnerson

C# is the foremost language for Microsoft's subsequent new release of home windows providers, the .NET platform. This new programming language is speedy and glossy and used to be designed to extend programmer productiveness. C# permits programmers to speedy construct a variety of functions for the recent Microsoft .NET platform. The .Net platform permits builders to construct C# elements to develop into internet prone to be had around the web. utilizing C# language constructs, those parts could be switched over into net prone, letting them be invoked around the web. Gunnerson's e-book is designed as a complete reference for expert programmers to assist get them up to the mark on C#. The writer is a lead developer on Microsoft's C# improvement crew, and has logged many developer hours writing and trying out C# code. As such, he is uniquely poised to coach builders the powerful use of this new language. A Microsoft insider, Gunnerson is additionally capable of clarify to readers how C# suits into Microsoft's new .NET framework. a last component to the booklet offers a historical past of C#, and a language comparability to different accepted programming languages. Gunnerson's e-book offers a beginning upon which programmers can start to strengthen in C#. one of the center themes lined are the COM+ setting, statements and circulation of execution, periods, structs, interfaces, expressions, arrays, enums, delegates and occasions, exception dealing with, interoperability, and chosen complex themes.

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The accessibility of the nested class follows similar rules to the ones outlined for the interaction of class and member modifiers. As with members, the accessibility modifier on a nested class defines what accessibility the nested class has outside of the nested class. Just as a private field is always visible within a class, a private nested class is also visible from within the class that contains it. In the following example, the Parser class has a Token class that it uses internally. Without using a nested class, it might be written as follows: public class Parser { Token[] tokens; } public class Token { string name; } In this example, both the Parser and Token classes are publicly accessible, which isn’t optimal.

Chapter 9: Structs (Value Types) Overview CLASSES WILL BE USED to implement most objects. Sometimes, however, it may be desirable to create an object that behaves like one of the built-in types; one that is cheap and fast to allocate and doesn’t have the overhead of references. In that case, a value type is used, which is done by declaring a struct in C#. Structs act similarly to classes, but with a few added restrictions. They can’t inherit from any other type (though they implicitly inherit from object), and other classes can’t inherit from them.

WriteLine("Exception: {0}", e); } } } When the DivideByZeroException is caught in the DoAverage() function, it is wrapped in a new exception that gives the user additional information about what caused the exception. Usually the wrapper exception is the same type as the caught exception, but this might change depending on the model presented to the caller. Main() Ideally, each function that wants to rethrow the exception will wrap it in an exception with additional contextual information. User-Defined Exception Classes One drawback of the last example is that the caller can’t tell what exception happened in the call to DoAverage() by looking at the type of the exception.

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