使用构造函数进行F#对象初始化

Question

我知道在F#中如果你有一个格式的C#类:

public class Person {
    public DateTime BirthDate { get; set; }
    public string Name { get; set; }
}

你可以像这样初始化它,这很好:

let p = new Person (Name = "John", BirthDate = DateTime.Now)

但是如果C#类也有这样的构造函数,你将如何在F#中初始化它:

public class Person {
    public Person(int id)
    {
        Id = id
    }

    public int Id {get; private set;}
    public DateTime BirthDate { get; set; }
    public string Name { get; set; }
}

我们是否被迫使用这种结构？

let p = new Person (123)
p.Name <- "John"
p.BirthDate <- DateTime.Now

Answer 1

对自动属性使用等效F#语法可能如下所示.您可以将构造函数和属性初始化组合如下:

type Person(id : int) =
    member val Id = id with get,set
    member val BirthDate = DateTime.MinValue with get,set
    member val Name = "" with get,set

let p = Person(5, Name = "Stu")
p |> Dump

Answer 2

该System.UriBuilderBCL类看起来像Person在OP类,所以我将用其作为一个例子:

> let ub = UriBuilder("http://blog.ploeh.dk", Path = "about");;    
val ub : UriBuilder = http://blog.ploeh.dk:80/about