EN CSharp Keyword enum

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C#: enum

Handbook C# · Practical Guide

Declare named integer values. Flags describes independent bits, but does not automatically check whether the values ​​are valid.

Simple example (Example.cs)

Save this example separately as Example.cs. Run it independently of the other examples on this page.

Example.cs:

// PROJECT-EXAMPLE
State state = State.Ready;
System.Console.WriteLine(state);
enum State { Idle, Ready }

Result:

Ready

Syntax

enum State { Idle, Active }

Example 1: simple form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        State state = State.Active;
        Console.WriteLine($"{state}:{(int)state}");
    }
}
public enum State : byte { Idle = 0, Active = 1 }

Example 2: another practical form

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;

public static class Program
{
    public static async Task Main(string[] args)
    {
        Options options = Options.Read | Options.Write;
        Console.WriteLine(options.HasFlag(Options.Read));
    }
}
[Flags] public enum Options { None = 0, Read = 1, Write = 2 }

Official source: Microsoft Learn.