语言基础csharpcs基础
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枚举 

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 enum PersonEnum
{
    rich,
    pool,
    none,
    homeless
}

不写与下效果一致

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[Flags]
enum PersonEnum
{
    rich = 0, // 00000000
    pool = 1, // 00000001
    none = 2, // 00000010
    homeless = 3, //00000011
}

定义多选

  • 规范为要在可以多选的 enum 上面写 [Flags]
  • 使其多选则要其|结果与其他都不同
  • 接受时用 &判断包含
  • A或B与A => A
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[Flags]
enum PersonEnum
{
    rich = 1,	 //00000001
    pool = 2,	 //00000010
    none = 4,	 //00000100
    homeless = 8,//00001000
}

static void Main()
{
    test(PersonEnum.pool | PersonEnum.homeless);
    Console.WriteLine("Hello World");
    Console.WriteLine(PersonEnum.homeless);
    Console.ReadKey();
}

private static void test(PersonEnum type)
{
    if ((type & PersonEnum.homeless) == PersonEnum.homeless)
    {
        Console.WriteLine("homeless");
    }
    if ((type & PersonEnum.rich) == PersonEnum.rich)
    {
        Console.WriteLine("rich");
    }
    if ((type & PersonEnum.none) == PersonEnum.none)
    {
        Console.WriteLine("none");
    }
    if ((type & PersonEnum.pool) == PersonEnum.pool)
    {
        Console.WriteLine("pool");
    }
}

数据类型转换

int ==> enum

数据类型 变量名 = (数据类型) 变量名

例: PersonEnum high = (PersonEnum)2;

enum ==> int

例: int enumInt = (int)PersonEnum.pool

string ==> enum

例: 

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PersonEnum enumString = (PersonEnum)Enum.Parse(typeof(PersonEnum), "pool");

enum ==> string

例: string strEnum = PersonEnum.pool.ToString();