F＃枚举

声明enumerations

type enum-name =
   | value1 = integer-literal1
   | value2 = integer-literal2
...

下面的例子演示了如何使用enumerations 

例

// Declaration of an enumeration.
type Days =
   | Sun = 0
   | Mon = 1
   | Tues = 2
   | Wed = 3
   | Thurs = 4
   | Fri = 5
   | Sat = 6

// Use of an enumeration.
let weekend1 : Days = Days.Sat
let weekend2 : Days = Days.Sun
let weekDay1 : Days = Days.Mon

printfn "Monday: %A" weekDay1
printfn "Saturday: %A" weekend1
printfn "Sunday: %A" weekend2

当你编译和执行程序，它产生以下输出 

Monday: Mon
Saturday: Sat
Sunday: Sun