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A Programmer's Guide to C# 5.0 by Eric Gunnerson

By Eric Gunnerson

A Programmer’s advisor to C# 5.0 is a ebook for software program builders who are looking to actually comprehend C#. even if you’ve labored with C# ahead of or with one other general-purpose programming language, each one fast paced, concentrated bankruptcy will take you directly to the guts of a function of C# and express you why it really works how it does.

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Success) { // process the error } This works okay, but every return value has to be checked for an error. If the above was written as CallFunction(); any error return would be thrown away. That’s where bugs come from. There are many different models for communicating status; some functions may return an HRESULT, some may return a Boolean value, and others may use some other mechanism. NET Runtime world, exceptions are the fundamental method of handling error conditions. Exceptions are nicer than return codes because they can’t be silently ignored.

0F; // minimum charge. 75F)); } } 26 Chapter 4 ■ Base Classes and Inheritance 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 override 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.

4 51 Chapter 6 ■ Member Accessibility and Overloading Better Conversions In some situations there are multiple matches based on the simple rule mentioned previously. 5 The three rules are as follows: 1. An exact match of type is preferred over one that requires a conversion. 2. If an implicit conversion exists from one type to another and there is no implicit conversion in the other direction, the type that has the implicit conversion is preferred. 3. If the argument is a signed integer type, a conversion to another signed integer type is preferred over one to an unsigned integer type.

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