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Enums can be declared as top-level structures or contained within a class or struct. The modifiers available depend on the context of the enum declaration. Table 5-4 summarizes the available modifiers for each context.
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5. Data Types
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Table 5-4. Enum Declaration Modifier Availability
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Enum Declaration Context Member of Namespace Accessibility public protected private internal protected internal Inheritance new abstract sealed virtual override Other readonly volatile static extern
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Member of Class Member of Struct
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N/A N/A (default) N/A N/A N/A (implicit) N/A N/A N/A N/A N/A N/A
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(default)
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N/A (default) N/A N/A N/A (implicit) N/A N/A N/A N/A N/A N/A
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N/A (implicit) N/A N/A N/A N/A N/A N/A
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Members and inheritance
The user-defined members of an enum are restricted to the set of public name/value pairs contained within the enum. Enums do not support user-defined inheritance, but all enums implicitly derive from System.Enum, which derives from System.ValueType and ultimately from System.Object. The System.Enum class provides a number of static methods for working with enum member names and values, summarized in Table 5-5.
Table 5-5. System.Enum Methods
Method GetName() GetNames() GetUnderlyingType() GetValues() IsDefined()
Description Gets the name of the member with the specified value in an enum. Gets an array of the member names contained within an enum. Gets the underlying base type of the enum. Gets an array of the member values contained within an enum. Determines whether the enum has a member with the specified value.
Reference Types
In C#, reference types include class, interface, array, and delegate. With the exception of delegate, Java developers will be familiar with all of these. We discuss each reference type in detail in the following sections.
5. Data Types
Classes
The implementation of classes in C# mirrors that of Java. Both are reference types, supporting single implementation inheritance and multiple interface implementations. The few differences that do exist are predominantly syntax changes or are required to support the modifiers and member types introduced by C#. Only Java anonymous and local classes have no C# equivalent.
Declaration
A C# class declaration takes the following form: [attributes] [modifiers] class identifier [:superclass] [interfaces] {body} The Java keywords extends and implements are not used. C# uses the colon to separate the class name from its superclasses and interfaces. Commas are used to separate the superclass and each subsequent interface name; the superclass must come first, or a compiler error will occur. For example, the following is the C# code to declare a public class named MyClass that inherits from the superclass MyBaseClass and implements two interfaces named IAnInterface and IAnotherInterface:
public MyClass : MyBaseClass, IAnInterface, IAnotherInterface { // Implementation code }
Modifiers
The applicability of modifiers to class declarations depends on the context in which the class is declared. Classes can be declared as a top-level type, being direct members of an enclosing namespace, or they can be nested within the definition of a class or struct. Table 5-6 summarizes modifier availability for classes.
Table 5-6. Class Declaration Modifier Availability
Class Declaration Context Member of Namespace Accessibility public protected private internal protected internal Inheritance new abstract
Member of Class Member of Struct
N/A N/A Member of Namespace (default) N/A N/A
N/A (default) (default) Member of Class Member of Struct N/A N/A
5. Data Types
sealed virtual override Other readonly volatile static extern
Members
N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A
N/A N/A N/A N/A N/A N/A
Classes can contain the following member types: constant, field, method, property, event, indexer, operator, instance constructor, static constructor, and nested type declarations. For comprehensive coverage of member types, see the "Members" section later in this chapter.
Abstract classes
The implementation of interface members represents an important difference in the default behavior of how abstract classes are handled in Java and C#. In Java, any interface members that are not implemented simply become abstract members that concrete classes must implement. C# abstract classes must provide implementations for all interface members, but the abstract class may declare the member as abstract. For example:
public interface MyInterface { int MyMethod(int x); } public abstract class MyClass : MyInterface { // Compile time error if the following declaration is missing public abstract int MyMethod(int x); }
Default constructor accessibility
The C# compiler, like the Java compiler, will provide a default constructor if one is not explicitly defined for a class. The accessibility Java assigns to this default constructor is the same as the accessibility of the containing class; C# defines the default constructor as protected if the class is abstract, otherwise as public.
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