A Programmer's Introduction to C# by Eric Gunnerson

By Eric Gunnerson

C# is the major language for Microsoft's subsequent iteration of home windows companies, the .NET platform. This new programming language is quick and glossy and was once designed to extend programmer productiveness. C# allows programmers to fast construct a variety of functions for the hot Microsoft .NET platform. The .Net platform permits builders to construct C# parts to turn into internet prone on hand around the net. utilizing C# language constructs, those parts might be switched over into internet prone, permitting them to be invoked around the web. Gunnerson's ebook is designed as a accomplished reference for expert programmers to aid get them on top of things 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 coach builders the potent use of this new language. A Microsoft insider, Gunnerson can also be in a position to clarify to readers how C# matches into Microsoft's new .NET framework. a last part of the booklet presents a historical past of C#, and a language comparability to different frequent programming languages. Gunnerson's ebook presents a beginning upon which programmers can start to enhance in C#. one of the center subject matters lined are the COM+ setting, statements and circulation of execution, sessions, structs, interfaces, expressions, arrays, enums, delegates and occasions, exception dealing with, interoperability, and chosen complex themes.

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The output of the code is as expected: Engineer Charge = 31 Civil Engineer Charge = 40 Unfortunately, the base class has now become much more complicated; for every function that cares about the type of a class, there is code to check all the possible types and call the correct function. That’s a lot of extra code, and it would be untenable if there were 50 kinds of engineers. Worse is the fact that the base class needs to know the names of all the derived classes for it to work. If the owner of the code needs to add support for a new engineer, the base class must be modified.

Ref and out Parameters Having to call two member functions to get the values may not always be convenient, so it would be nice to be able to get both values with a single function call. There’s only one return value, however. WriteLine("myPoint({0}, {1})", x, y); } } In this code, the parameters have been declared using the ref keyword, as has the call to the function. This code should work, but when compiled, it generates an error message that says that uninitialized values were used for the ref parameters x and y.

In a Color class, it can be very useful to have constants as part of the class for the common colors. Red; } } - 60 - This clearly doesn’t work, since the static members Red, Green, and Blue can’t be calculated at compile time. But making them normal public members doesn’t work either, since anybody could change the red value to olive drab, or puce. The readonly modifier is designed for exactly that situation. By applying readonly, the value can be set in the constructor or in an initializer, but can’t be modified later.

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