Json.net `JsonConstructor` 构造函数参数名称

构造函数参数IList;SpokenLanguages 匹配反映的名称而不是覆盖的属性名称:

The constructor argument IList<SpokenLanguage> SpokenLanguages matches the reflected name rather than the overridden property name:

 [JsonProperty("spoken_languages")]
 public IList<ISpokenLanguage> SpokenLanguages { get; set; }

IListSysTypes 都不匹配(这是问题中的错字吗?)

IList<SysType> SysTypes matches neither (is this a typo in the question?)

然而，重要的是 JSON 文件本身中的属性名称 和 构造函数参数名称，如 JsonSerializerInternalReader.ResolvePropertyAndCreatorValues().该算法的简化版本如下:

However, what matters is the property name in the JSON file itself and the constructor argument name as shown in JsonSerializerInternalReader.ResolvePropertyAndCreatorValues(). A simplified version of the algorithm is as follows:

1. 从 JSON 文件中读取属性名称.
2. 找到最接近的匹配构造函数参数(如果有).
3. 找到最匹配的成员名称(如果有).
4. 如果 JSON 属性与构造函数参数匹配，则反序列化为该类型并传递给构造函数，
5. 但如果不是，则反序列化为适当的成员类型，并在构造后设置成员值.

(当 JSON 属性与 both 匹配并且开发人员期望，例如 [JsonProperty(Required = Required.Always)] 在构造函数中设置时应尊重添加到成员的内容.)

(The implementation becomes complex when a JSON property matches both and developers expect that, for instance, [JsonProperty(Required = Required.Always)] added to the member should be respected when set in the constructor.)

因此构造函数参数 production_countries 将匹配 JSON 中名为 production_countries" 的值，而构造函数参数 SpokenLanguages 将 不匹配名为 spoken_languages" 的 JSON 值.

Thus the constructor argument production_countries will match a value named "production_countries" in the JSON, while the constructor argument SpokenLanguages will not match a JSON value named "spoken_languages".

那么，如何成功反序列化你的类型呢?首先，您可以使用 [JsonProperty(overrideName)] 标记构造函数参数以覆盖反序列化期间使用的构造函数名称:

So, how to deserialize your type successfully? Firstly, you could mark the constructor parameters with [JsonProperty(overrideName)] to override the constructor name used during deserialization:

public partial class AClass : ISomeBase
{
    public AClass() { }

    [JsonConstructor]
    public AClass([JsonProperty("Genres")] IList<SysType> SysTypes, IList<ProductionCountry> production_countries, [JsonProperty("spoken_languages")] IList<SpokenLanguage> SpokenLanguages)
    {
        this.Genres = SysTypes == null ? null : SysTypes.Cast<IGenre>().ToList();
        this.ProductionCountries = production_countries == null ? null : production_countries.Cast<IProductionCountry>().ToList();
        this.SpokenLanguages = SpokenLanguages == null ? null : SpokenLanguages.Cast<ISpokenLanguage>().ToList();
    }

其次，由于您似乎使用构造函数将包含接口的集合中的项目反序列化为具体对象，您可以考虑使用基于 CustomCreationConverter 作为 ItemConverter:

Secondly, since you seem to be using the constructor to deserialize items in collections containing interfaces as concrete objects, you could consider using a single generic converter based on CustomCreationConverter as an ItemConverter:

public partial class AClass : ISomeBase
{
    public AClass() { }

    public int Id { get; set; }

    [JsonProperty(ItemConverterType = typeof(CustomCreationConverter<IGenre, SysType>))]
    public IList<IGenre> Genres { get; set; }

    [JsonProperty("production_countries", ItemConverterType = typeof(CustomCreationConverter<IProductionCountry, ProductionCountry>))]
    public IList<IProductionCountry> ProductionCountries { get; set; }

    [JsonProperty("spoken_languages", ItemConverterType = typeof(CustomCreationConverter<ISpokenLanguage, SpokenLanguage>))]
    public IList<ISpokenLanguage> SpokenLanguages { get; set; }
}

public class CustomCreationConverter<T, TSerialized> : CustomCreationConverter<T> where TSerialized : T, new()
{
    public override T Create(Type objectType)
    {
        return new TSerialized();
    }
}

小提琴示例显示了这两个选项.

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