// 定义一个表示星期的枚举
enum Weekday
{
    Monday,    // 值为 0
    Tuesday,   // 值为 1
    Wednesday, // 值为 2
    Thursday,  // 值为 3
    Friday     // 值为 4
}

// 定义带整数值的枚举
enum Status
{
    Pending = 1,
    Approved = 2,
    Rejected = 3
}

// 枚举也可以基于不同的整数类型（如 byte、short、long）
enum Priority : byte
{
    Low = 1,
    Medium = 2,
    High = 3
}

Weekday today = Weekday.Monday;
Console.WriteLine(today);        // 输出: Monday
Console.WriteLine((int)today);   // 输出: 0

Status approval = Status.Approved;
Console.WriteLine(approval);     // 输出: Approved
Console.WriteLine((int)approval); // 输出: 2

// 遍历枚举的所有值
Console.WriteLine("Weekday values:");
foreach (Weekday day in Enum.GetValues(typeof(Weekday)))
{
    Console.WriteLine($"{day} = {(int)day}");
}

// 遍历枚举的所有名称
Console.WriteLine("\nWeekday names:");
foreach (string name in Enum.GetNames(typeof(Weekday)))
{
    Console.WriteLine(name);
}

[Flags]
enum FileAccess
{
    None = 0,
    Read = 1,
    Write = 2,
    ReadWrite = Read | Write
}

FileAccess access = FileAccess.Read | FileAccess.Write;
Console.WriteLine(access); // 输出: Read, Write

if (Enum.TryParse("Approved", out Status result))
{
    Console.WriteLine(result);
}
else
{
    Console.WriteLine("无效的枚举值");
}