New PDF release: Foundations of Object-Oriented Programming Using .NET 2.0

By Christian Gross

The point of interest of this ebook is to provide object-oriented programming utilizing .NET styles. styles are at present being mostly taught in accordance with the idea that the reader is familiar with item orientated programming innovations. This has led to one other hole because the innovations taught frequently conflict with the ideas utilized by the reader. The development thought is additionally summary and sometimes fails to make the leap from idea to functional. the aim of this e-book is to mend the object-oriented and development programming difficulty by means of "mixing" the two—that is, instructing object-oriented ideas utilizing styles. If a second is taken to consider the matter, this can be a very logical process because it promotes a solutions-based method. The options are "how to create an object," "how to outline the place one desires to go," "how could one outline the implementation", and so forth. This booklet is exclusive in that it really is modeled after the author’s profitable talking fabric that applies styles in a truly pragmatic and functional demeanour. The fabrics can be geared up utilizing initiatives, provided utilizing styles, and illustrated utilizing improvement difficulties and recommendations. This e-book will reference open resource tasks that illustrate the various improvement difficulties and strategies. the point of interest is to exploit functional strategies that builders come upon daily, similar to database manipulations, GUI improvement, or heart tier part improvement. there'll be no specialize in particular applied sciences; for instance, to demonstrate database manipulations, Microsoft SQL Server can be used, however the booklet will concentrate on utilizing a wide-spread database and the SQL programming language.

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Using the virtual keyword means that the method has declared itself as a candidate for being overridden. The types Human and Dog subclass the type Animal, and redefine the method WhatAmI. The keyword override is used to indicate that the virtual method will be overridden, and any reference to the WhatAmI method will be redirected to the appropriate method. WhatAmI(); "Created Human and assigned to Animal"); Human(); "Created Dog and assigned to Animal"); Dog(); The types Human and Dog are instantiated and assigned to the variables animal1 and animal2, which are the type Animal.

If both tests are true, then a log entry is written. The code, as presented here, has two problems: what happens if the logging configuration file is incorrect, or if the message priority isn’t enabled? The answer is that if the parameter val is less than zero and logging isn’t enabled, a message won’t be logged, and the application thinks everything is executing correctly. This is an example of where writing clever or compact code introduces an error. fm Page 33 Thursday, August 25, 2005 5:51 AM CHAPTER 2 ■ LOGGING, ERRORS, AND TEST-DRIVEN DEVELOPMENT In the rewritten example, the test val is separated from the test of the property IsErrorEnabled.

Syntax errors aren’t a problem, and generally speaking, doing an improper cast is also not a major problem. It’s easy to find and fix this type of problem. More problematic are logical errors, a kind of error that Generics don’t address. In fact, in some cases, Generics amplify the problem, because the source code that uses Generics extensively is abstract and requires some thinking to figure out what’s being defined. Putting it simply, imagine developing an architecture that can be abstracted.

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