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

本文介绍了F#:如何将Json.NET [JsonConstructor]属性应用于主要构造函数?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试在F#中执行某些操作，例如JsonConstructorAttribute示例> Json.NET文档:

I'm trying to do something in F# like the JsonConstructorAttribute example in the Json.NET documentation:

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#中的类似物似乎类似于以下内容，但在[<JsonConstructor>]的放置位置时出现错误:

The analog in F# appears to be something like the following, but I'm getting an error on the placement of [<JsonConstructor>]:

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

错误是

此属性不适用于此语言元素

This attribute is not valid for use on this language element

那么，如何用[<JsonConstructor>]装饰主构造函数?

So then, how do I decorate the primary constructor with [<JsonConstructor>]?

推荐答案

事实证明，这很简单.通过将[<JsonConstructor>]放在主要构造函数的参数列表之前来定位主要构造函数:

It turns out that it's pretty easy. Target the primary constructor by placing [<JsonConstructor>] just before the primary constructor's parameter list:

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