c# json 反序列化 asp.Net 后台 消息

Question

[{"totalDiscountAmount":10.0000,"promotions":
[{"promotionId":"15806","itemId":"271","discountAmount":10.0000,"discountPercentage":null,"promotionType":2,"promotionName":"惠百真大豆油_2件立减10","promotionDescription":"","combinationFlag":"0","promotionKind":"1","giftItems":null}]}]
以上是我接到的消息，promotions和giftItems是list。
然后用下面

JArray json = JArray.Parse(result);

result就是上面收到的消息

List<PromotionGroups> reips = (List<PromotionGroups>)JsonConvert.DeserializeObject(json["promotions"]["giftItems"].ToString(), typeof(List<PromotionGroups>));

然后报错，null
请教大神，在线等

Answer 1

解决了 问题是 josn里面如果有NULL 需要修改setting