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","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","ReservationActivityContent": "1","ReservationId": "cebea7bf-44b1-4565-8cdd-78b6156c5f4d","ReservationTime": "2019-06-10 02:52:18","ReservationForTime": "08:00-10:00","ReservationPersonPhone": "132****4545","ReservationPersonName": "冷**","ReservationUnit": "技术部","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","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~

（编辑：李大同）

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