如何在C#中使用标志

本文关键字：标志 | 更新日期: 2023-09-27 18:09:35

在C#中，我以前见过以标志格式使用的枚举。例如使用Regex对象。

Regex regex = new Regex("expression", RegexOptions.Something | RegexOptions.SomethingElse);

如果我有一个自定义枚举：

enum DisplayType
{
    Normal,
    Inverted,
    Italics,
    Bold
}

如何格式化一个方法以接受一个参数的多个枚举，例如Regex的语法？即CCD_ 2。

如何在C#中使用标志

使用FlagsAttribute。MSDN文档解释了一切。没有必要在这里重复。

举个例子，你会说：

[Flags]
enum DisplayType {
    None = 0,
    Normal = 1,
    Inverted = 2,
    Italics = 4,
    Bold = 8
}

像一样使用FlagsAttribute

[Flags]
enum DisplayType
{
    None = 0x0,
    Normal = 0x1,
    Inverted = 0x2,
    Italics = 0x4,
    Bold = 0x8
}

我知道我参加聚会有点晚了，但我想添加我保留的这个代码片段，因为它可以帮助我在需要时创建标记枚举。

[Flags]
enum Generic32BitFlags
{
    None  =            0,       /* 00000000000000000000000000000000 */
    Bit1  =            1 << 1,  /* 00000000000000000000000000000001 */
    Bit2  =            1 << 2,  /* 00000000000000000000000000000010 */
    Bit3  =            1 << 3,  /* 00000000000000000000000000000100 */
    Bit4  =            1 << 4,  /* 00000000000000000000000000001000 */
    Bit5  =            1 << 5,  /* 00000000000000000000000000010000 */
    Bit6  =            1 << 6,  /* 00000000000000000000000000100000 */
    Bit7  =            1 << 7,  /* 00000000000000000000000001000000 */
    Bit8  =            1 << 8,  /* 00000000000000000000000010000000 */
    Bit9  =            1 << 9,  /* 00000000000000000000000100000000 */
    Bit10 =            1 << 10, /* 00000000000000000000001000000000 */
    Bit11 =            1 << 11, /* 00000000000000000000010000000000 */
    Bit12 =            1 << 12, /* 00000000000000000000100000000000 */
    Bit13 =            1 << 13, /* 00000000000000000001000000000000 */
    Bit14 =            1 << 14, /* 00000000000000000010000000000000 */
    Bit15 =            1 << 15, /* 00000000000000000100000000000000 */
    Bit16 =            1 << 16, /* 00000000000000001000000000000000 */
    Bit17 =            1 << 17, /* 00000000000000010000000000000000 */
    Bit18 =            1 << 18, /* 00000000000000100000000000000000 */
    Bit19 =            1 << 19, /* 00000000000001000000000000000000 */
    Bit20 =            1 << 20, /* 00000000000010000000000000000000 */
    Bit21 =            1 << 21, /* 00000000000100000000000000000000 */
    Bit22 =            1 << 22, /* 00000000001000000000000000000000 */
    Bit23 =            1 << 23, /* 00000000010000000000000000000000 */
    Bit24 =            1 << 24, /* 00000000100000000000000000000000 */
    Bit25 =            1 << 25, /* 00000001000000000000000000000000 */
    Bit26 =            1 << 26, /* 00000010000000000000000000000000 */
    Bit27 =            1 << 27, /* 00000100000000000000000000000000 */
    Bit28 =            1 << 28, /* 00001000000000000000000000000000 */
    Bit29 =            1 << 29, /* 00010000000000000000000000000000 */
    Bit30 =            1 << 30, /* 00100000000000000000000000000000 */
    Bit31 =            1 << 31, /* 01000000000000000000000000000000 */
    Bit32 =            1 << 32, /* 10000000000000000000000000000000 */
}

请参阅此处的"枚举类型作为位标志"：http://msdn.microsoft.com/en-us/library/cc138362.aspx

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