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Important Symbols defined by an enumerated type are constant values . So when a compiler
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sees code that references an enumerated type s symbol, the compiler substitutes the symbol s numeric value at compile time, and this code no longer references the enumerated type that defined the symbol . This means that the assembly that defines the enumerated type may not be required at runtime; it was required only when compiling . If you have code that references the enumerated type rather than just having references to symbols defined by the type the assembly containing the enumerated type s definition will be required at runtime . Some versioning issues arise because enumerated type symbols are constants instead of read-only values . I explained these issues in the Constants section of 7, Constants and Fields .
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For example, the System.Enum type has a static method called GetUnderlyingType, and the System.Type type has an instance method called GetEnumUnderlyingType:
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public static Type GetUnderlyingType(Type enumType); public Type GetEnumUnderlyingType(); // Defined in System.Enum // Defined in System.Type
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These methods return the core type used to hold an enumerated type s value . Every enumerated type has an underlying type, which can be a byte, sbyte, short, ushort, int (the most common type and what C# chooses by default), uint, long, or ulong . Of course, these C# primitive types correspond to FCL types . However, to make the implementation of the compiler itself simpler, the C# compiler requires you to specify a primitive type name here; using an FCL type name (such as Int32) generates the following message: "error CS1008: Type byte, sbyte, short, ushort, int, uint, long, or ulong expected." The following code shows how to declare an enumerated type with an underlying type of byte (System.Byte):
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internal enum Color : byte { White, Red, Green, Blue, Orange }
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With the Color enumerated type defined in this way, the following code shows what GetUnderlyingType will return:
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// The following line displays "System.Byte". Console.WriteLine(Enum.GetUnderlyingType(typeof(Color)));
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The C# compiler treats enumerated types as primitive types . As such, you can use many of the familiar operators (==, !=, <, >, <=, >=, +, -, ^, &, |, ~, ++, and --) to manipulate enumerated type instances . All of these operators actually work on the value__ instance field inside each enumerated type instance . Furthermore, the C# compiler allows you to explicitly cast instances of an enumerated type to a different enumerated type . You can also explicitly cast an enumerated type instance to a numeric type .
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Part III Essential Types
Given an instance of an enumerated type, it s possible to map that value to one of several string representations by calling the ToString method inherited from System.Enum:
Color c = Color.Blue; Console.WriteLine(c); Console.WriteLine(c.ToString()); Console.WriteLine(c.ToString("G")); Console.WriteLine(c.ToString("D")); Console.WriteLine(c.ToString("X")); // // // // // "Blue" "Blue" "Blue" "3" "03" (General format) (General format) (General format) (Decimal format) (Hex format)
Note When using hex formatting, ToString always outputs uppercase letters . In addition, the
number of digits outputted depends on the enum s underlying type: 2 digits for byte/sbyte, 4 digits for short/ushort, 8 digits for int/uint, and 16 digits for long/ulong . Leading zeros are outputted if necessary .
In addition to the ToString method, the System.Enum type offers a static Format method that you can call to format an enumerated type s value:
public static String Format(Type enumType, Object value, String format);
Generally, I prefer to call the ToString method because it requires less code and it s easier to call . But using Format has one advantage over ToString: Format lets you pass a numeric value for the value parameter; you don t have to have an instance of the enumerated type . For example, the following code will display Blue :
// The following line displays "Blue". Console.WriteLine(Enum.Format(typeof(Color), 3, "G"));
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