在code波纹管
' no Flags'
Public Enum MyEnum
Monday = 1
Tuesday = 2
Wednesday = 4
Thursday = 8
End Enum
和
<Flags()> _
Public Enum MyEnum
Monday = 1
Tuesday = 2
Wednesday = 4
Thursday = 8
End Enum
我做的
Dim days As MyEnum = MyEnum.Monday Or MyEnum.Tuesday Or MyEnum.Wednesday
If (days And MyEnum.Tuesday) = MyEnum.Tuesday Then
Console.WriteLine("Tuesday OK") ' here'
Else
Console.WriteLine("Tuesday NOK")
End If
If (days And MyEnum.Thursday ) = MyEnum.Thursday Then
Console.WriteLine("Thursday OK")
Else
Console.WriteLine("Thursday NOK") ' here'
End If
和获得相同的结果在两种情况下(有或没有FlagAttribute)。
and obtain the same result in both cases(with or without FlagAttribute).
基本上,它告诉了枚举值可以组合的CLR。如果没有这个属性,结合数值将导致一个未知的值(但它仍然是有效的)。与属性,组合PTED正确间$ P $
Basically, it tells the CLR that the values of the enum can be combined. Without this attribute, combining the values would result in an unknown value (but it would still be valid). With the attribute, the combination is correctly interpreted
没有标记
属性:
' Gives "Monday, Tuesday" '
Dim s As String = (MyEnum.Monday Or MyEnum.Tuesday).ToString()
没有标记
属性:
' Gives "3" '
Dim s As String = (MyEnum.Monday Or MyEnum.Tuesday).ToString()