Json。Net:填充接口属性时指定对象类型

是的,这看起来像是复制品- JsonConverterAttribute 看起来效果不错。为完整起见,以下是解决方案:

...
public class Master : IMaster
{
   [JsonConverter(typeof(ModelJsonConverter), typeof(Slave))]
   public ISlave ObjectProp {get; set; }
}
...
public class ModelJsonConverter : JsonConverter
    {
        public Type InstanceType { get; set; }
        public ModelJsonConverter(Type instanceType):base()
        {
            InstanceType = instanceType;
        }

        public override bool CanWrite => false;
        public override bool CanRead => true;
        public override bool CanConvert(Type objectType)
        {
            if (objectType == InstanceType) return true;
            else return InstanceType.GetTypeInfo().Is​Subclass​Of(objectType);
        }

        public override void WriteJson(JsonWriter writer,
                                       object value, JsonSerializer serializer)
        {
            throw new InvalidOperationException("Use default serialization.");
        }

        public override object ReadJson(JsonReader reader,
                                        Type objectType, object existingValue,
                                        JsonSerializer serializer)
        {
            if (reader.TokenType == JsonToken.Null) return null;
            else if (reader.TokenType != JsonToken.StartObject) throw new JsonException($"Unexpected Json token at {reader.Path}: {reader.TokenType.ToString()}");
            var deserialized = Activator.CreateInstance(InstanceType);
            serializer.Populate(reader, deserialized);
            return deserialized;
        }

    }