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Eric Gunnerson's A Programmer's Introduction to C# PDF

By Eric Gunnerson

C# is the foremost language for Microsoft's subsequent new release of home windows companies, the .NET platform. This new programming language is quickly and glossy and used to be designed to extend programmer productiveness. C# allows programmers to quick construct quite a lot of functions for the hot Microsoft .NET platform. The .Net platform allows builders to construct C# elements to turn into internet companies on hand around the net. utilizing C# language constructs, those parts could be switched over into net companies, permitting them to be invoked around the web. Gunnerson's e-book is designed as a entire reference for specialist programmers to aid get them up to the mark on C#. The writer is a lead developer on Microsoft's C# improvement staff, and has logged many developer hours writing and trying out C# code. As such, he is uniquely poised to educate builders the powerful use of this new language. A Microsoft insider, Gunnerson can be capable of clarify to readers how C# suits into Microsoft's new .NET framework. a last component to the e-book presents a background of C#, and a language comparability to different conventional programming languages. Gunnerson's publication offers a beginning upon which programmers can start to improve in C#. one of the middle issues coated are the COM+ atmosphere, statements and move of execution, sessions, structs, interfaces, expressions, arrays, enums, delegates and occasions, exception dealing with, interoperability, and chosen complex subject matters.

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0F; // minimum charge. 75F)); } } The CalculateCharge() and TypeName() functions are now declared with the virtual keyword in the base class, and that’s all that the base class has to know. It needs no knowledge of the derived types, other than to know that each derived class can implement CalculateCharge() and TypeName(), if desired. In the derived class, the functions are declared with the override keyword, which means that they are the same function that was declared in the base class. If the override keyword is missing, the compiler will assume that the function is unrelated to the base class’s function, and virtual dispatching won’t function.

In addition to the version that takes the array, it usually makes sense to provide one or more specific versions of the function. This is useful both for efficiency (so the object array doesn’t have to be created), and so that languages that don’t support the params syntax don’t have to use the object array for all calls. Overloading a function with versions that take one, two, and three parameters, plus a version that takes an array, is a good rule of thumb. Chapter 9: Structs (Value Types) Overview CLASSES WILL BE USED to implement most objects.

Close() would have been skipped, and the file would have remained open. The code inside the finally block is guaranteed to execute before the exit of the function, whether there is an exception or not. Close() call in the finally block, the file will always be closed. Efficiency and Overhead In languages without garbage collection, adding exception handling is expensive, since all objects within a function must be tracked to make sure that they are properly destroyed if an exception is thrown. The required tracking code both adds execution time and code size to a function.

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