asp.net core 3.0 MVC JSON 全局配置

原文链接：https://www.cnblogs.com/lenovo_tiger_love/archive/2019/12/17/12054253.html

• System.Text.Json(default)

1. startup配置代码如下：

 1 using System.Text.Encodings.Web;
 2 using System.Text.Json;
 3 using System.Text.Unicode;
 4 
 5 public void ConfigureServices(IServiceCollection services)
 6 {
 7      services.AddJsonOptions(options =>
 8             {
 9                 //格式化日期时间格式
10                 options.JsonSerializerOptions.Converters.Add(new DatetimeJsonConverter());
11                 //数据格式首字母小写
12                 //options.JsonSerializerOptions.PropertyNamingPolicy =JsonNamingPolicy.CamelCase;
13                 //数据格式原样输出
14                 options.JsonSerializerOptions.PropertyNamingPolicy = null;
15                 //取消Unicode编码
16                 options.JsonSerializerOptions.Encoder = JavaScriptEncoder.Create(UnicodeRanges.All);
17                 //忽略空值
18                 options.JsonSerializerOptions.IgnoreNullValues = true;
19                 //允许额外符号
20                 options.JsonSerializerOptions.AllowTrailingCommas = true;
21                 //反序列化过程中属性名称是否使用不区分大小写的比较
22                 options.JsonSerializerOptions.PropertyNameCaseInsensitive = false;
23             });
24 }

 1 using System;
 2 using System.Text.Json;
 3 using System.Text.Json.Serialization;
 4 
 5 
 6 public class DatetimeJsonConverter : JsonConverter
 7     {
 8         public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
 9         {
10             if (reader.TokenType == JsonTokenType.String)
11             {
12                 if (DateTime.TryParse(reader.GetString(), out DateTime date))
13                     return date;
14             }
15             return reader.GetDateTime();
16         }
17 
18         public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
19         {
20             writer.WriteStringValue(value.ToString("yyyy-MM-dd HH:mm:ss"));
21         }
22     }

1. 官方API

• Newtonsoft.Json

1. Install-Package Microsoft.AspNetCore.Mvc.NewtonsoftJson -Version 3.1.0
2. startup配置代码如下：

 1 using Newtonsoft.Json;
 2 using Newtonsoft.Json.Serialization;
 3 public void ConfigureServices(IServiceCollection services)
 4 {
 5     services.AddNewtonsoftJson(options =>
 6             {
 7                 //设置时间格式
 8                 options.SerializerSettings.DateFormatString = "yyyy-MM-dd HH:mm:ss";
 9                 //忽略循环引用
10                 options.SerializerSettings.ReferenceLoopHandling = ReferenceLoopHandling.Ignore;
11                 //数据格式首字母小写
12                 //options.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
13                 //数据格式按原样输出
14                 options.SerializerSettings.ContractResolver = new DefaultContractResolver();
15                 //忽略空值
16                 options.SerializerSettings.NullValueHandling = NullValueHandling.Ignore;
17             });
18 }
19