我只是使用 JsonConverter 正如我上面在我的问题中提到的.在我的完整代码下方:

I just resolve my problem using JsonConverter as I mentioned above in my question. Below my complete code:

public class Order
{
    public int Id { get; set; }

    [JsonConverter(typeof(ShippingMethodConverter))]
    public string ShippingMethod { get; set; }
}

public class ShippingMethodConverter : JsonConverter
{

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException("Not implemented yet");
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.TokenType == JsonToken.Null)
        {
            return string.Empty;
        } 
        else if (reader.TokenType == JsonToken.String)
        {
            return serializer.Deserialize(reader, objectType);
        }
        else
        {
            JObject obj = JObject.Load(reader);
            if (obj["Code"] != null) 
                return obj["Code"].ToString();
            else 
                return serializer.Deserialize(reader, objectType);
        }
    }

    public override bool CanWrite
    {
        get { return false; }
    }

    public override bool CanConvert(Type objectType)
    {
        return false;
    }
}