Question

module Classes =

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

    /// An instances of the students class
    let student1 = Student("bob", 20)
    let student2 = Student("sally",18)
    let student3 = Student("frank",22)
    let student4 = Student("lisa",19)
    let student5 = Student("john",17)


    printfn "student 1: %s, age: %d" student1.Name student1.Age
    printfn "student 2: %s, age: %d" student2.Name student2.Age
    printfn "student 3: %s, age: %d" student3.Name student3.Age
    printfn "student 4: %s, age: %d" student4.Name student4.Age
    printfn "student 5: %s, age: %d" student5.Name student5.Age



    let studentList =  [student1; student2; student3; student4; student5]  

  //  studentList |> List.iter (printf "%s , %d")
    printfn "%O" studentList
    printfn "%A" studentList
    studentList |> List.iter (printf "%s" Student)

Answer 1

这将是正确的代码：

studentList |> List.iter (fun s -> printf "Name: %s, Age: %s" s.Name s.Age)

或者这个：

studentList |> List.iter (printf "%A")

我真的无法想到从哪里开始解释原始版本的问题...对于初学者，为什么要将Student作为第二个参数传递给最后一个printf线？你甚至没有在任何地方定义，所以它有点令人费解。其次，我不会在这种模型中使用类，记录会更适合。

我真的，真的鼓励你在开始一个项目之前获得一些关于F＃的理论知识。我可以全心全意地推荐的一个资源是fsharpforfunandprofit.com。

我在F＃中打印我创建的对象列表时遇到问题。这就是我到目前为止所拥有的。

1 个答案: