C # enumeration related usage

What is enumeration?

　　Enumeration is a set of named integer constants. Enumerated type is to use the  enum  keyword declared. Enumeration is a value type. In other words, the enumeration contains its own value and can not inherit or transfer inheritance.

Enumeration definitions :

public enum Direction
{
    [Description("东")]
    East,
    [Description("南")]
    South,
    [Description("西")]
    West,
    [Description("北")]
    North 
}

The default value is zero-based enumeration int, int next enumerated value will automatically add a tired enumeration value. For example: East = 1, then the South = 2, West = 3, and so on. . . Or East = 4, then the South = 5, West = 7, North = 8. . .

Gets int value enumeration:

var eastNumber = (int)Direction.East;
// eastNumber = 0;

Gets an enumeration of strings:

var eastString = Direction.East.ToString();
// eastString= "East";

int turn enumeration:

var east = (Direction)0;
// east = Direction.East

string turn enumeration:

String strEnum = const "East"; 
// ignoreCase: to true / false (whether or not ignore case .true: Ignore case (default), false: do not ignore) 
var East that Enum.Parse = (typeof (Direction), strEnum, ignoreCase : to true); 
// Direction.East = East;

For a description (Description) enumeration:

/// <Summary> 
/// Gets an enumeration method described 
/// </ Summary> 
/// <param name = "enumValue"> </ param> 
/// <Returns> </ Returns> 
public static String GetEnumDescription (the Enum enumValue) 
{ 
    String value = enumValue.ToString (); 
    the FieldInfo Field enumValue.GetType = () GetField (value);. 
    Object [] = field.GetCustomAttributes OBJS (typeof (the DescriptionAttribute), to false); // Get the description attribute 
    if (objs.Length == 0) // if there is no description attribute, the name of the direct return 
        return value; 
    the DescriptionAttribute DescriptionAttribute = (the DescriptionAttribute) OBJS [0]; 
    return descriptionAttribute.Description; 
}

// Call Gets an enumeration of the methods described 
var = GetEnumDescription the Description (Direction.East); 
// the Description = "East";    

Enumeration loop:

foreach (Direction item in Enum.GetValues(typeof(Direction)))
{
    // item is East/South/West/North
}