Back End/🌈 ASP.NET
Enumeration types (C# reference)
James Wetzel
2022. 6. 16. 15:37
enum Season
{
Spring,
Summer,
Autumn,
Winter
}
enum ErrorCode : ushort
{
None = 0,
Unknown = 1,
ConnectionLost = 100,
OutlierReading = 200
}
enum 과 switch 문 활용 예)
public enum WhiteIpRequestState
{
NoRequest = 0,
Requested = 1,
Approved = 2,
Rejected = 3
}
WhiteIpRequestState whiteIpRequestState = ...
switch(whiteIpRequestState)
{
case WhiteIpRequestState.NoRequest:
case WhiteIpRequestState.Rejected:
return RedirectToAction("WhiteIpRequest", "Login");
case WhiteIpRequestState.Requested:
return RedirectToAction("WhiteIpRequestInProcess", "Login");
default:
break;
}
[Flags]
public enum Days
{
None = 0b_0000_0000, // 0
Monday = 0b_0000_0001, // 1
Tuesday = 0b_0000_0010, // 2
Wednesday = 0b_0000_0100, // 4
Thursday = 0b_0000_1000, // 8
Friday = 0b_0001_0000, // 16
Saturday = 0b_0010_0000, // 32
Sunday = 0b_0100_0000, // 64
Weekend = Saturday | Sunday
}
public class FlagsEnumExample
{
public static void Main()
{
Days meetingDays = Days.Monday | Days.Wednesday | Days.Friday;
Console.WriteLine(meetingDays);
// Output:
// Monday, Wednesday, Friday
Days workingFromHomeDays = Days.Thursday | Days.Friday;
Console.WriteLine($"Join a meeting by phone on {meetingDays & workingFromHomeDays}");
// Output:
// Join a meeting by phone on Friday
bool isMeetingOnTuesday = (meetingDays & Days.Tuesday) == Days.Tuesday;
Console.WriteLine($"Is there a meeting on Tuesday: {isMeetingOnTuesday}");
// Output:
// Is there a meeting on Tuesday: False
var a = (Days)37;
Console.WriteLine(a);
// Output:
// Monday, Wednesday, Saturday
}
}
public enum Season
{
Spring,
Summer,
Autumn,
Winter
}
public class EnumConversionExample
{
public static void Main()
{
Season a = Season.Autumn;
Console.WriteLine($"Integral value of {a} is {(int)a}"); // output: Integral value of Autumn is 2
var b = (Season)1;
Console.WriteLine(b); // output: Summer
var c = (Season)4;
Console.WriteLine(c); // output: 4
}
}
An enumeration type (or enum type) is a value type defined by a set of named constants of the underlying integral numeric type. To define an enumeration type, use the enum keyword and specify the names of enum members:
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