14

C# – Flags 形式的 Enum

 3 years ago
source link: https://naclyen.com/2020/04/14/c-flags-%e5%bd%a2%e5%bc%8f%e7%9a%84-enum/
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十進位表示法

[Flags]
enum Days
{
    None      = 0,  // 0000 0000
    Sunday    = 1,  // 0000 0001
    Monday    = 2,  // 0000 0010
    Tuesday   = 4,  // 0000 0100
    Wednesday = 8,  // 0000 1000
    Thursday  = 16, // 0001 0000
    Friday    = 32, // 0010 0000
    Saturday  = 64  // 0100 0000
}

位元移位表示法

[Flags]
enum Days
{
    None      = 0,      // 0000 0000
    Sunday    = 1 << 0, // 0000 0001
    Monday    = 1 << 1, // 0000 0010
    Tuesday   = 1 << 2, // 0000 0100
    Wednesday = 1 << 3, // 0000 1000
    Thursday  = 1 << 4, // 0001 0000
    Friday    = 1 << 5, // 0010 0000
    Saturday  = 1 << 6  // 0100 0000
}

二進位表示法 (C# 7.2新增)

[Flags]
enum Days
{
    None      = 0b_0000_0000, // 0000 0000
    Sunday    = 0b_0000_0001, // 0000 0001
    Monday    = 0b_0000_0010, // 0000 0010
    Tuesday   = 0b_0000_0100, // 0000 0100
    Wednesday = 0b_0000_1000, // 0000 1000
    Thursday  = 0b_0001_0000, // 0001 0000
    Friday    = 0b_0010_0000, // 0010 0000
    Saturday  = 0b_0100_0000  // 0100 0000
}

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