using Newtonsoft.Json;
using System.Linq.Dynamic.Core;
using System.Text.Json.Serialization;

DynamicProperty[] props = new DynamicProperty[] { new DynamicProperty("Name", typeof(string)), new DynamicProperty("Birthday", typeof(DateTime)) };
Type type = DynamicClassFactory.CreateType(props);
DynamicClass dynamicClass = Activator.CreateInstance(type) as DynamicClass;
dynamicClass.SetDynamicPropertyValue("Name", "Albert");
dynamicClass.SetDynamicPropertyValue("Birthday", new DateTime(1879, 3, 14));
Console.WriteLine(dynamicClass);

JsonConvert.SerializeObject(dynamicClass);

Console.ReadLine();