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CLASSES AND INHERITANCE
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The second assembly contains the declaration of a class called DerivedClass, which inherits from MyBaseClass, declared in the first assembly. The source file is named Assembly2.cs. Figure 7-14 illustrates the two assemblies. DerivedClass has an empty body but inherits method PrintMe from MyBaseClass. Main creates an object of type DerivedClass and calls its inherited method PrintMe.
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// Source file name Assembly2.cs using System; using BaseClassNS; Namespace containing declaration of base class namespace UsesBaseClass { Base class in other assembly class DerivedClass: MyBaseClass { // Empty body } class Program { static void Main( ) { DerivedClass mdc = new DerivedClass(); mdc.PrintMe(); } } } This code produces the following output: I am MyBaseClass
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Figure 7-14. Inheriting across assemblies
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Member Access Modifiers
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The previous two sections explained class accessibility. With class accessibility, there are only two modifiers internal and public. This section covers member accessibility. Class accessibility describes the visibility of a class; member accessibility describes the visibility of the members of a class object. Each member declared in a class is visible to various parts of the system, depending on the access modifier assigned to it in its class declaration. You ve seen that private members are visible only to other members of the same class, while public members can be visible to classes outside the assembly as well. In this section, we ll look again at the public and private access levels, as well as the three other levels of accessibility. Before looking at the specifics of member accessibility, there are some general things we need to cover first: All members explicitly declared in a class s declaration are visible to each other, regardless of their accessibility specification. Inherited members are not explicitly declared in a class s declaration, so, as you ll see, inherited members might or might not be visible to members of a derived class. There are five member access levels: public private protected internal protected internal
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You must specify member access levels on a per-member basis. If you don t specify an access level for a member, its implicit access level is private. A member cannot be more accessible than its class. That is, if a class has an accessibility level limiting it to the assembly, individual members of the class cannot be seen outside the assembly, regardless of their access modifiers, even public.
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Regions Accessing a Member
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The member access modifiers in a class s declaration specify which other types can and cannot access which members of the class. For example, the following declaration shows members declared with the five access levels. public class MyClass { public private protected internal protected internal ...
int int int int int
Member1; Member2; Member3; Member4; Member5;
The access levels are based on two characteristics with regard to the class being declared: Whether the class is derived from the class being declared Whether a class is in the same assembly as the class being declared
These two characteristics yield four groups, as illustrated in Figure 7-15. In relation to the class being declared, another class can be any of the following: In the same assembly and derived from it (bottom right) In the same assembly but not derived from it (bottom left) In a different assembly and derived from it (top right) In a different assembly and not derived from it (top left) These characteristics are used to define the five access levels.
Figure 7-15. Areas of accessibility
CLASSES AND INHERITANCE
Public Member Accessibility
The public access level is the least restrictive. All classes both inside and outside the assembly have free access to the member. Figure 7-16 illustrates the accessibility of a public class member of MyClass. To declare a member public, use the public access modifier, as shown. Keyword public int Member1;
Figure 7-16. A public member of a public class is visible to all classes in the same assembly or other assemblies.
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