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Figure 6-10. Inheritance through class derivation The VolvoCar class is the most specialized, and it has inherited members from Car and System.Object. (The methods that are inherited from System.Object are explained later in this chapter and elsewhere in the book.) As we continue to add classes to represent different cars, we can place new features where they most make sense. For example, the VolvoCar class contains a feature that is unique to Volvo cars a field representing which fixed set of Volvo in-car entertainment options has been installed. If I had added this feature to the Car class, any class derived from Car would inherit the VolvoSoundSystem field. We don t want to do that because this field has no relevance to cars made by, say, Ford. If I had added the VolvoSoundSystem to a class derived from VolvoCar, I would have to duplicate the field in every other class that derives from VolvoCar. When considering where to place a field, method, or other class member, try to find the sweet spot that doesn t add irrelevant features to classes and doesn t require duplication in peer-level classes.
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IIndexSet needs to have a reference to the IEnumerable collection that it is indexing, such as BusinessListBase and other CSLA .NET collection classes. When you write a class that supports IIndexSet, you are typically managing the set of IIndex objects (individual indices, described in the following sections) that constitute the index set, and providing the logic for performing the search to determine whether the query can use an index. You can think of the classes that implement this interface as coordinators for all indexing activity. Classes should evaluate the expression tree passed to Search(), determine the correct index to use (if applicable), and then either use the index (if it is an indexed property) or perform the search on the original collection (if there is no available index).
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1. Right-click SLVideoPlayer01 and create a new class called VideoData. 2. Right-click SLVideoPlayer01 and create a new class called Video. 3. Open VideoData. 4. The first thing to do in VideoData is specify the root (highest level node) of our XML file (note
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You can define custom format components and implement support for them using the System.IFormatProvider and System.ICustomFormatter interfaces. Let s imagine that we want to create a custom format component that we will use to format the string representation of Car objects. We want format component to be a combination of three characters: M to represent the manufacturer, O for the model, and C for the color. We want to be able to exclude one or more of the characters and be able to change the order of the characters to change the order of the information in the string representation of the Car. The first step is to create an implementation of the IFormatProvider interface. Listing 16-28 contains an implementation suitable for our example. Listing 16-28. An Implementation of the IFormatProvider Interface class CarFormatProvider : IFormatProvider { public object GetFormat(Type formatType) { if (formatType == typeof(System.ICustomFormatter)) {
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If instead you declare the Print method of SecondDerived as new, the result is as shown in Figure 7-10. Main is the same as in the previous case. class SecondDerived : MyDerivedClass { new public void Print() { Console.WriteLine("This is the second derived class."); } } class Program { static void Main() { SecondDerived derived = new SecondDerived(); MyBaseClass mybc = (MyBaseClass)derived; derived.Print(); mybc.Print(); } } The result is that when method Print is called through the reference to SecondDerived, the method in SecondDerived is executed, as you would expect. When the method is called through a reference to MyBaseClass, however, the method call is passed up only one level, to class MyDerived, where it is executed. The only difference between the two cases is whether the method in SecondDerived is declared with modifier override or modifier new. This code produces the following output: This is the second derived class. This is the derived class.
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You will see a small alert window pop up on the iPod touch and the sound will play.
As stated in 1, the managed type system is unified. Every managed type directly or indirectly inherits explicitly or implicitly from a single type called Object. This includes all reference types and the boxed form of all value types, and even the built-in primitive types, considering the aliases for those types such as Int32, Char, Double, etc. In 2, you saw how the array type is an object type, complete with properties, such as Length, and methods. These methods are part of the System::Array class. In fact, there are also methods defined on the Object class that every managed type has. Listing 4-1 is what the declaration of the Object type would look like, showing the available public methods (there are some protected methods as well, not shown here). Listing 4-1. The Object Type ref class Object { public: virtual Type^ GetType(); virtual String^ ToString(); virtual bool Equals(Object^); static bool Equals(Object^, Object^); static bool ReferenceEquals(Object^); virtual int GetHashCode(); }; The unified type system enables us to create functions that can operate on objects of any type, simply by taking a handle to Object as a parameter. The function can then figure out the type of the object and do something appropriate for that object. Or, in the case of a collection class, a single collection type with object handles as its elements could be used for objects of any type, although you ll see in 11 that a generic collection would be better. A very simple example of a function that might be useful is one that displays the type of an object
References
System; System.Collections.Generic; System.Linq; System.Text; System.Dynamic; System.Threading.Tasks; System.Diagnostics; System.Threading; System.Collections.Concurrent;
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