A Programmer's Introduction to C# by Eric Gunnerson

By Eric Gunnerson

C# is the main language for Microsoft's subsequent iteration of home windows providers, the .NET platform. This new programming language is speedy and glossy and was once designed to extend programmer productiveness. C# permits programmers to speedy construct quite a lot of functions for the hot Microsoft .NET platform. The .Net platform permits builders to construct C# elements to develop into internet providers on hand around the web. utilizing C# language constructs, those elements might be switched over into net companies, letting them be invoked around the web. Gunnerson's e-book is designed as a accomplished 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 workforce, and has logged many developer hours writing and trying out C# code. As such, he is uniquely poised to coach builders the potent use of this new language. A Microsoft insider, Gunnerson can be in a position to clarify to readers how C# suits into Microsoft's new .NET framework. a last component to the publication presents a historical past of C#, and a language comparability to different typical programming languages. Gunnerson's publication offers a origin upon which programmers can start to advance in C#. one of the center themes coated are the COM+ setting, statements and stream of execution, sessions, structs, interfaces, expressions, arrays, enums, delegates and occasions, exception dealing with, interoperability, and chosen complex subject matters.

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A static constructor cannot have any parameters. class MyClass { static MyClass() { } } There is no static destructor analog of a destructor. Constants C# allows values be defined as constants. For a value to be a constant, its value must be something that can be written as a constant. This limits the types of constants to the built-in types that can be written as literal values. Not surprisingly, putting const in front of a variable means that its value can- not be changed. Here’s an example of some constants: using System; enum MyEnum { Jet } class LotsOLiterals { // const items can't be changed.

A JIT could, however, notice that there were no derived classes from the class on which the function call was made, and convert the virtual dispatch to a straight call. ” Abstract Classes There is a small problem with the approach used so far. A new class doesn’t have to implement the TypeName() function, since it can inherit the implementation from Engineer. This makes it easy for a new class of engineer to have the wrong name associated with it. 50F); earray[1] = new ChemicalEngineer("Dr. 75F)); } } The ChemicalEngineer class will inherit the CalculateCharge() function from Engineer, which might be correct, but it will also inherit TypeName(), which is definitely wrong.

0F); earray[1] = new ChemicalEngineer("Dr. , has one or more abstract functions), and the addition of abstract before the TypeName() virtual function. The use of abstract on the virtual function is the important one; the one before the name of the class makes it clear that the class is abstract, since the abstract function could easily be buried amongst the other functions. The implementation of CivilEngineer is identical, except that now the compiler will check to make sure that TypeName() is implemented by both CivilEngineer and ChemicalEngineer.

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