newtonsoft.json 指定某个属性使用特定的时间格式

intro

newtonsoft.json 是 .net 下最受欢迎 json 操作库，原为 json.net 后改名为 newtonsoft.json，之前一直推荐大家使用，除了性能好之外，主要是功能丰富，基本满足所有的可能用到的场景（不区分小写，现在还不行，，）。

遇到这样一个需求，全局使用一种时间格式，某些属性使用特殊的时间格式，这里以一个日期为例

solution

解决办法：自定义一个 converter，针对某一个属性使用，datetimeformatconverter源码:

using newtonsoft.json.converters;

namespace weihanli.common.json
{
  public class datetimeformatconverter : isodatetimeconverter
  {
    public datetimeformatconverter(string format)
    {
      datetimeformat = format;
    }
  }
}

在需要设置格式的属性上设置 converter https://github.com/weihanli/activityreservation/blob/dev/activityreservation.helper/viewmodels/reservationviewmodel.cs#l8

[display(name = "预约日期")]
[jsonconverter(typeof(datetimeformatconverter), "yyyy-mm-dd")]
public datetime reservationfordate { get; set; }

请求 api 地址 https://reservation.weihanli.xyz/api/reservation?pagenumber=1&pagesize=5,返回的数据如下所示：

{
    "data": [
        {
            "reservationfordate": "2019-06-10",
            "reservationfortime": "08:00~09:50",
            "reservationpersonphone": "123****0112",
            "reservationpersonname": "儿**",
            "reservationunit": "51",
            "reservationplacename": "多媒体工作室",
            "reservationactivitycontent": "62",
            "reservationid": "f7ab9128-0977-4fd8-9b1a-92648228b397",
            "reservationtime": "2019-06-09 05:19:11",
            "reservationstatus": 1
        },
        {
            "reservationfordate": "2019-06-12",
            "reservationfortime": "10:00-12:00",
            "reservationpersonphone": "133****3541",
            "reservationpersonname": "试**",
            "reservationunit": "ss",
            "reservationplacename": "多媒体工作室",
            "reservationactivitycontent": "ss",
            "reservationid": "6c145aea-dc14-4ed9-a47f-48c0b79f7601",
            "reservationtime": "2019-06-11 12:45:14",
            "reservationstatus": 0
        },
        {
            "reservationfordate": "2019-06-17",
            "reservationfortime": "14:00-16:00",
            "reservationpersonphone": "138****3883",
            "reservationpersonname": "大**",
            "reservationunit": "1",
            "reservationplacename": "多媒体工作室",
            "reservationactivitycontent": "1",
            "reservationid": "cebea7bf-44b1-4565-8cdd-78b6156c5f4d",
            "reservationtime": "2019-06-10 02:52:18",
            "reservationstatus": 1
        },
        {
            "reservationfordate": "2019-06-17",
            "reservationfortime": "08:00-10:00",
            "reservationpersonphone": "132****4545",
            "reservationpersonname": "冷**",
            "reservationunit": "技术部",
            "reservationplacename": "多媒体工作室",
            "reservationactivitycontent": "技术部培训",
            "reservationid": "07f6f8fd-f232-478e-9a94-de0f5fa9b4e9",
            "reservationtime": "2019-06-10 01:44:52",
            "reservationstatus": 2
        },
        {
            "reservationfordate": "2019-06-22",
            "reservationfortime": "10:00~11:50",
            "reservationpersonphone": "132****3333",
            "reservationpersonname": "测**",
            "reservationunit": "测试",
            "reservationplacename": "多媒体工作室",
            "reservationactivitycontent": "测试",
            "reservationid": "27d0fb7a-ce14-4958-8636-dd10e5526083",
            "reservationtime": "2019-06-18 10:57:06",
            "reservationstatus": 1
        }
    ],
    "pagenumber": 1,
    "pagesize": 5,
    "totalcount": 18,
    "pagecount": 4,
    "count": 5
}

可以看到 reservationfordate 序列化之后返回的格式如我们指定的格式了~