反序列化派生类时如何忽略基类 JsonConverter？

我有一个抽象基类：

[JsonConverter(typeof(Converter))]
public abstract class TextComponent {
    ...
    public bool Bold { get; set; }
    public TextComponent[] Extra { get; set; }
    ...
}

还有更多继承自它的类。其中一门课是StringComponent:

public sealed class StringComponent : TextComponent
{
    public string Text { get; set; }

    public StringComponent(string text)
    {
        Text = text;
    }
}

Converter，这是一个JsonConverter应用于TextComponent看起来像这样：

private sealed class Converter : JsonConverter
{
    ....

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue,
        JsonSerializer serializer)
    {
        var tok = JToken.Load(reader);
        switch (tok)
        {
            ...
            case JObject x:
                var dic = (IDictionary<string, JToken>) x;
                if (dic.ContainsKey("text")) return x.ToObject<StringComponent>();
                ...
            ...
        }
    }
    ...
    public override bool CanConvert(Type objectType) => objectType == typeof(TextComponent);
}

问题:

var str = "{\"text\":\"hello world\"}";
var obj = JsonConvert.DeserializeObject<TextComponent>(str);
// this doesn't work either:
var obj = JsonConvert.DeserializeObject<StringComponent>(str);

这进入无限“循环”，最终导致StackOverflow，因为调用时DeserializeObject<Stringcomponent> or ToObject<StringComponent>, the JsonConverter基类（Converter) 再次调用这些方法。这不是期望的行为。序列化派生类时，它们不应使用基类的JsonConverter。如果你看CanConvert的方法Converter，我也只允许它TextComponent仅适用于它的任何派生类。

那么我该如何解决这个问题呢？

可以将子类合约上的转换器设置为null；

    public override bool CanWrite => false;
    public override bool CanRead => true;

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (objectType == typeof(BaseClass))
        {
            JObject item = JObject.Load(reader);
            if (item["isClass2"].Value<bool>())
            {
                return item.ToObject<ChildClass2>(serializer);
            }
            else
            {
                return item.ToObject<ChildClass1>(serializer);
            }
        }
        else
        {
            serializer.ContractResolver.ResolveContract(objectType).Converter = null;
            return serializer.Deserialize(reader, objectType);
        }
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}