F#：如何将Json.NET [JsonConstructor]属性应用于主构造函数？

我试图在F#中做一些事情,就像 Json.NET documentation中的JsonConstructorAttribute示例：

public class User
{
    public string UserName { get; private set; }
    public bool Enabled { get; private set; }

    public User()
    {
    }

    [JsonConstructor]
    public User(string userName,bool enabled)
    {
        UserName = userName;
        Enabled = enabled;
    }
}

F#中的模拟类似于以下内容,但我在[< JsonConstructor>]的位置上收到错误：

[<JsonConstructor>] // ERROR! (see below)
type User (userName : string,enabled : bool) =
    member this.UserName = userName
    member this.Enabled = enabled

错误是

This attribute is not valid for use on this language element

那么,我如何使用[< JsonConstructor>]装饰主构造函数？

解决方法

事实证明,这很容易.通过在主构造函数的参数列表之前放置[< JsonConstructor>]来定位主构造函数：

type User [<JsonConstructor>] (userName : string,enabled : bool) =
    member this.UserName = userName
    member this.Enabled = enabled