tests/DotNetCommon.Test/Serialize/DiffNewtonsoftAndSystemTextJson.cs

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using DotNetCommon.Extensions;
using Newtonsoft.Json.Linq;
using NUnit.Framework;
using Shouldly;
using System;
using System.Data;
using System.Text.Json;
using System.Text.Json.Nodes;

namespace DotNetCommon.Test.Serialize
{
    [TestFixture]
    internal class DiffNewtonsoftAndSystemTextJson
    {
        class Demo
        {
            public int? Num { get; set; }
        }

        /// <summary>
        /// SystemTextJson 无法 "" => int? 无法转为null
        /// </summary>
        [Test]
        public void Test()
        {
            var str = "{\"Num\":\"\"}";
            var d = Newtonsoft.Json.JsonConvert.DeserializeObject<Demo>(str);
            d.Num.ShouldBe(null);

            try
            {
                System.Text.Json.JsonSerializer.Deserialize<Demo>(str);
            }
            catch (Exception ex)
            {
                ex.Message.ShouldBe("The JSON value could not be converted to System.Nullable`1[System.Int32]. Path: $.Num | LineNumber: 0 | BytePositionInLine: 9.");
            }

            //兼容了
            var d2 = str.ToObject<Demo>();
            d2.Num.ShouldBe(null);
        }

        class Demo2
        {
            public int Num { get; set; }
        }
        /// <summary>
        /// 均无法 null 或 "" => int
        /// </summary>
        [Test]
        public void Test2()
        {
            var str = "{\"Num\":null}";
            try
            {
                Newtonsoft.Json.JsonConvert.DeserializeObject<Demo2>(str);
            }
            catch (Exception ex)
            {