【F＃接口】F＃提供接口类型。它提供了纯抽象。它是抽象方法的集合。实现接口的类必须为其所有方法提供定义。
句法：
// Interface declaration:
[ attributes ]
type interface-name =
[ interface ][ inherit base-interface-name ...]
abstract member1 : [ argument-types1 ->
] return-type1
abstract member2 : [ argument-types2 ->
] return-type2
...
[ end ]F＃接口示例在此示例中, 我们创建了一个接口并将其实现为一个类。
type IEmployee =
abstract member ShowName : unit ->
unittype Manager(id:int, name:string) =
interface IEmployee with
member this.ShowName() = printfn "Id = %d \nName = %s" id namelet manager = new Manager(100, "RajKumar")
//manager.ShowName()// error: you can't directly access interface abstract method by using class object.
// so, we need to upcast class type object to interface type by using :>
operator.
(manager :>
IEmployee).ShowName()输出：
Id = 100
Name = RajKumar
