序列化根级类型的序列化类型不同于低级类型

Question

在JSON.NET中，是否有可能在序列化层次结构中序列化的词句类型与层次结构中较低级别遇到的参考？

中遇到的参考

例如，使用此类型

class Serialized {
  public Serialized Serialized;
  public int A;
}

在此设置中

var serialized = new Serialized() { A = 1 };
var serialized2 = new Serialized() { A = 2 };
serialized.Serialized = serialized2;
string json = GetJson(serialized);

json是

{
  "A":1
  "Serialized": {
    "ref":2
  }
}

具体来说，根级序列化应使用默认序列化策略，而较低级别的序列化应使用自定义转换器（或类似）。

Answer 1

您需要定义自定义JsonConverter并用它装饰Serialized属性：

public class PropertyConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return true;
    }
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        if (value == null) return;
        var serialized = (Serialized)value;
        writer.WriteStartObject();
        writer.WritePropertyName("ref");
        writer.WriteValue(serialized.A);
        writer.WriteEndObject();
    }
}

和您的班级：

class Serialized {
    [JsonConverter(typeof(PropertyConverter))
    public Serialized Serialized;
    public int A;
}

这仅适用于一个嵌套级别。如果您需要它来工作多个嵌套级别，则需要修改转换器：

public class PropertyConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return true;
    }
    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        if (value == null) return;
        var serialized = (Serialized)value;
        writer.WriteStartObject();
        writer.WritePropertyName("ref");
        writer.WriteValue(serialized.A);
        if(serialized.Serialized != null)
        {
            writer.WritePropertyName("nested");
            writer.WriteValue(JsonConvert.SerializeObject(serialized.Serialized, new JsonConverter[] {new PropertyConverter()}));
        }
        writer.WriteEndObject();
    }
}