EFB/Sessions/SessionExtensions.cs

using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;

namespace EFB.Sessions
{
    public static class SessionExtensions
    {
        public static void SetObject(this ISession session, string key, object value)
        {//Sets the object of a session to Object
            session.SetString(key, JsonConvert.SerializeObject(value, Formatting.None,
                new JsonSerializerSettings()
                {
                    ReferenceLoopHandling = ReferenceLoopHandling.Ignore
                }
            ));
        }

        public static T GetObject<T>(this ISession session, string key)
        {//Gets a session of known type (T)
            var value = session.GetString(key);
            return value == null ? default(T) : JsonConvert.DeserializeObject<T>(value);
        }
    }
}