.net core中关于System.Text.Json的使用

  在.Net Framework的时候序列化经常使用Newtonsoft.Json插件来使用,而在.Net Core中自带了System.Text.Json,号称性能更好,今天抽空就来捣鼓一下。

  使用起来其实也很简单,就是有些地方要注意,比如在我们的对象实体中有中文的话,直接序列化时中文会被转换成编码格式,时间格式序列化时会被转成默认的格式等。

  下面就直接上Demo的代码了

using System;
using System.Text.Encodings.Web;
using System.Text.Json;
using System.Text.Json.Serialization;
using System.Text.Unicode;

namespace ConsoleApp4
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");

            var user = new User{ 
                Id= 1,
                Name = "张三李四",
                Gender = Gender.Male,
                Email="Jesen@qq.com",
                CreatedTime = DateTime.Now
            };

            JsonSerializerOptions options = new JsonSerializerOptions();
            options.Encoder = JavaScriptEncoder.Create(UnicodeRanges.All); //解决中文序列化被编码的问题
            options.Converters.Add(new DateTimeConverter()); //解决时间格式序列化的问题

            var serializeString = JsonSerializer.Serialize(user, options);
            Console.WriteLine(serializeString);


            User obj = JsonSerializer.Deserialize<User>(serializeString,options);


            Console.ReadLine();
        }
    }

    class User
    {
        public int Id { get; set; }

        public string Name { get; set; }

        [JsonConverter(typeof(JsonStringEnumConverter))] //解决枚举序列化时被转成数值的问题
        public Gender Gender { get; set; }

        public string Email { get; set; }

        public DateTime CreatedTime { get; set; }
    }


    enum Gender
    {
        Male,

        FaleMale
    }


    public class DateTimeConverter : 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"));
        }
    }

    public class DateTimeNullableConverter : JsonConverter<DateTime?>
    {
        public override DateTime? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
        {
            return string.IsNullOrEmpty(reader.GetString()) ? default(DateTime?) : DateTime.Parse(reader.GetString());
        }

        public override void Write(Utf8JsonWriter writer, DateTime? value, JsonSerializerOptions options)
        {
            writer.WriteStringValue(value?.ToString("yyyy-MM-dd HH:mm:ss"));
        }
    }
    
}
文章来自:https://www.cnblogs.com/jesen1315/p/12023760.html
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