在.NET Web API设置响应输出Json数据格式常用的两种方式详解

    public class UserInfoModel
    {
        public DateTime DateTime { get; set; }
        public int NumberIndex { get; set; }
        public string UserName { get; set; }
    }

    [ApiController]
    [Route("[controller]")]
    public class UserInfoController : ControllerBase
    {
        private static readonly string[] NameList = new[] { "追逐时光者", "小明同学", "DotNetGuide", "小艺同学", "Edwin" };
        [HttpGet(Name = "GetUserInfo")]
        public IEnumerable<UserInfoModel> Get()
        {
            return Enumerable.Range(1, 5).Select(index => new UserInfoModel
            {
                DateTime = DateTime.Now.AddDays(index),
                NumberIndex = Random.Shared.Next(-20, 55),
                UserName = NameList[Random.Shared.Next(NameList.Length)]
            }).ToArray();
        }
    }

    public class DateTimeJsonConverter : JsonConverter<DateTime>
    {
        public override DateTime Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            return DateTime.Parse(reader.GetString());
        }
        public override void Write(Utf8JsonWriter writer, DateTime value, JsonSerializerOptions options)
        {
            writer.WriteStringValue(value.ToString("yyyy-MM-dd HH:mm:ss"));
        }
    }

            builder.Services.AddControllers().AddJsonOptions(options =>
            {
                //命名规则，该值指定用于将对象上的属性名称转换为另一种格式(例如驼峰大小写)或为空以保持属性名称不变的策略[前端想要使用与后端模型本身命名格式输出]。
                options.JsonSerializerOptions.PropertyNamingPolicy = null;
                //自定义输出的时间格式
                options.JsonSerializerOptions.Converters.Add(new DateTimeJsonConverter());
            });

            builder.Services.AddControllers().AddNewtonsoftJson(options =>
            {
                //修改属性名称的序列化方式[前端想要使用与后端模型本身命名格式输出]
                options.SerializerSettings.ContractResolver = null;
                //方式1：日期类型默认格式化处理 
                options.SerializerSettings.Converters.Add(new IsoDateTimeConverter() { DateTimeFormat = "yyyy-MM-dd HH:mm:ss" });
                //方式2：日期类型默认格式化处理 
                //options.SerializerSettings.DateFormatHandling = Newtonsoft.Json.DateFormatHandling.MicrosoftDateFormat;
                //options.SerializerSettings.DateFormatString = "yyyy-MM-dd HH:mm:ss";
            });