Read e-book online Comprehensive VB .NET Debugging PDF

By Mark Pearce

ISBN-10: 1590590503

ISBN-13: 9781590590508

Visible Studio .NET and, extra particularly, visible uncomplicated .NET supply builders extra productiveness and extra energy to increase functions, yet on the price of a fancy improvement surroundings and with a complete new set of power bugs.Comprehensive VB .NET Debugging analyzes the recent illness varieties that come up with VB .NET and investigates the debugging of each form of VB .NET program including many universal debugging eventualities. writer Mark Pearce indicates you the way to take advantage of the strong new .NET debugging instruments to discover insects anywhere they hideeven buried deep inside dispensed functions.

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Listing 2-9. Lame Cat Equal to Any Other Cat? WriteLine("Equal to a cat? WriteLine("Equal to a cat? NET Once again, you see a surprise when you look at the ugly cat: NormalCat is a Cat It has 4 legs and 4 feet LameCat is a LameCat It has 3 legs and 3 feet Equal to a cat? True UglyCat is a LameCat It has 3 legs and 3 feet Equal to a cat? False The explanation for this behavior is subtle. The Equals member of LameCat does not actually overload the Equals member for Cat, because Cats inherit from Object, whose Equals member takes an Object parameter.

Name = "Martin" Given the preceding example, you might be wondering what happens if you assign a value-type variable to a reference-type variable. When you do this, the CLR performs an automatic type conversion calling boxing. A boxing conversion implies making a copy of the value being boxed. Listing 2-23 shows what happens in a typical boxing operation and compares it with a similar operation that doesn't involve boxing. First a boolean and an object variable are declared, and both are set to the value of false.

The key lies in the Protected keyword and the way in which it interacts with the Overrides and Shadows keywords. A protected member without a Friend qualifier can only be accessed from within its own class or a derived class. Clients of the base class or the derived class cannot access it. So in each of the previous tests, the member within the Animal class is the only method that is ever invoked directly. ClassName member and can be called. However, the combination of the Protected and Shadows qualifiers on the ClassName member within the Feline class blocks access from the base class to that member and any associated member above it in the inheritance chain.

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Comprehensive VB .NET Debugging by Mark Pearce

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