How to access session variables from any class in ASP.NET?
asp.net, c#, session-variables
Solution
(Updated for completeness) You can access session variables from any page or control using `Session["loginId"]` and from any class (e.g. from inside a class library), using `System.Web.HttpContext.Current.Session["loginId"].`
But please read on for my original answer...
I always use a wrapper class around the ASP.NET session to simplify access to session variables:
public class MySession
{
// private constructor
private MySession()
{
Property1 = "default value";
}
// Gets the current session.
public static MySession Current
{
get
{
MySession session =
(MySession)HttpContext.Current.Session["__MySession__"];
if (session == null)
{
session = new MySession();
HttpContext.Current.Session["__MySession__"] = session;
}
return session;
}
}
// **** add your session properties here, e.g like this:
public string Property1 { get; set; }
public DateTime MyDate { get; set; }
public int LoginId { get; set; }
}
This class stores one instance of itself in the ASP.NET session and allows you to access your session properties in a type-safe way from any class, e.g like this:
int loginId = MySession.Current.LoginId;
string property1 = MySession.Current.Property1;
MySession.Current.Property1 = newValue;
DateTime myDate = MySession.Current.MyDate;
MySession.Current.MyDate = DateTime.Now;
This approach has several advantages:
- it saves you from a lot of type-casting
- you don't have to use hard-coded session keys throughout your application (e.g. Session["loginId"]
- you can document your session items by adding XML doc comments on the properties of MySession
- you can initialize your session variables with default values (e.g. assuring they are not null)
Problem
I have created a class file in the App_Code folder in my application. I have a session variable ``` Session["loginId"] ``` I want to access this session variables in my class, but when I am writing the following line then it gives error ``` Session["loginId"] ``` Can anyone tell me how to access session variables within a class which is created in app_code folder in ASP.NET 2.0 (C#)