如何在JsonConverterAttribute中将属性传递给StringEnumConverter

问题描述

我正在尝试使用Newtonsoft的JsonConvert将对象列表序列化为JSON.我的Marker类包含一个枚举，我正尝试将其序列化为camelCase字符串.基于其他Stackoverflow问题，我正在尝试使用StringEnumConverter:

I'm trying to serialize a list of objects to JSON using Newtonsoft's JsonConvert. My Marker class includes an enum, and I'm trying to serialize it into a camelCase string. Based on other Stackoverflow questions, I'm trying to use the StringEnumConverter:

public enum MarkerType
{
    None = 0,
    Bookmark = 1,
    Highlight = 2
}

public class Marker
{
    [JsonConverter(typeof(StringEnumConverter)]
    public MarkerType MarkerType { get; set; }
}

这部分起作用，但是当我打电话时我的MarkerType字符串是PascalCase

This partially works, but my MarkerType string is PascalCase when I call:

var json = JsonConvert.SerializeObject(markers, Formatting.None);

结果:

{
    ...,
    "MarkerType":"Bookmark"
}

我真正想要的是:

{
    ...,
    "MarkerType":"bookmark"
}

StringEnumConverter文档提到了CamelCaseText属性，但我我不确定如何使用JsonConverterAttribute传递它.以下代码失败:

The StringEnumConverter docs mention a CamelCaseText property, but I'm not sure how to pass that using the JsonConverterAttribute. The following code fails:

[JsonConverter(typeof(StringEnumConverter), new object[] { "camelCaseText" }]

如何在JsonConverterAttribute中为StringEnumConverter指定CamelCaseText属性?

推荐答案

JsonConverterAttribute 有两个构造函数，其中一个带有参数列表(Object[]).这会从第一个参数映射到该类型的构造函数.

JsonConverterAttribute has two constructors, one of which takes a parameter list (Object[]). This maps to the constructor of the type from the first parameter.

StringEnumConverter 可以使用大多数非默认值来处理此问题构造函数.

StringEnumConverter can handle this with most of its non-default constructors.

第一个在JSON.net中已作废12+

The first one is obsolete in JSON.net 12+

第二个允许您指定 NamingStrategy 类型； CamelCaseNamingStrategy 可以解决问题.实际上，对于所提供的六个构造函数中的三个，这是正确的.

The second one allows you to specify a NamingStrategy Type; the CamelCaseNamingStrategy does the trick. Actually, this is true for three out of the six constructors provided.

注意:另一个构造函数打破了常规，要求NamingStrategy的实例而不是类型.

Note: one other constructor breaks the mold, asking for an instance of a NamingStrategy instead of a type.

它看起来像这样:

[JsonConverter(typeof(StringEnumConverter), typeof(CamelCaseNamingStrategy))]
public MarkerType MarkerType { get; set; }

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