Question

我有一个课程服务和一个界面服务。我想将这两个实现为 ExampleService 类。

我知道C＃，在C＃中我们可以使用下面的代码

来做到这一点

Maininterfacecontroller

我怎么能用F＃谢谢。

Answer 1

type ExampleService() =
    inherit Service()

    interface IService with
    // Below is interface implementation
        member x.ImplementedInterfaceMember() = 
            ...

Answer 2

首先，让我们看一下F＃wiki页面here:

中的界面语法

open System

type Person(name : string, age : int) = 
 member this.Name = name
 member this.Age = age

(* IComparable is used for ordering instances *)
 interface IComparable<Person> with
    member this.CompareTo(other) =
        (* sorts by name, then age *)
        match this.Name.CompareTo(other.Name) with
        | 0 -> this.Age.CompareTo(other.Age)
        | n -> n

(* Used for comparing this type against other types *)
 interface IEquatable<string> with
    member this.Equals(othername) = this.Name.Equals(othername)

如您所见，接口包含在类中，其功能通过关键字with来描述。

现在让我们看一下官方MSDN网站中描述的继承模块：

type MyClassBase1() =
  let mutable z = 0
  abstract member function1 : int -> int
  default u.function1(a : int) = z <- z + a; z

type MyClassDerived1() =
  inherit MyClassBase1()
  override u.function1(a: int) = a + 1

这里，另一个类写在外面，实现/覆盖在关键字inherits之后。

所以，在你的情况下：

type Service()=
 (* Service parent class details here *)

type ExampleService() = 
 inherit Service()
 (* More stuff about the parent class here, i.e overrides *)
 interface IService<ExampleClass> with
 (* Add here the interface details. *)

如何模拟F＃中的多重继承模式？

2 个答案: