How to access the Session in ASP.NET Core via static variable?

Question

In earlier version of Asp.Net session can be accessed in any page like a static variable using

System.Web.HttpContext.Current.Session[\"key\"]

Answer 1

If you want to store and retrieve a complex object from Session, you could instead use these extensions:

public static class SessionExtensions
{
    public static void SetObjectAsJson(this ISession session, string key, object value)
    {
        session.SetString(key, JsonConvert.SerializeObject(value));
    }

    public static T GetObjectFromJson(this ISession session, string key)
    {
        var data = session.GetString(key);  
        if (data == null)  
        {  
            return default(T);  
        }  
        return JsonConvert.DeserializeObject(data);
    }
}

Then you would call them like this:

User user = new User();  
user.Name = "Jignesh Trivedi";  
user.Percentage = 75.45;             

HttpContext.Session.SetComplexData("UserData", user); 

Or,

ViewBag.data = HttpContext.Session.GetComplexData("UserData");  

For details, please see https://www.c-sharpcorner.com/article/session-state-in-asp-net-core/