get session class variable jquery

Question

Im am developing an MVC 5 App.

I have a UserLoginModel class assigned to a Session Variable.

public class UserLoginModel
{
  public long User_id { get; set; }
  public string Email { get; set; }
  public int Rol_id { get; set; }
  public string Name { get; set; }
  public string LastName { get; set; }
}

private const string SessionKey = "UserLogin";
private readonly HttpContext _httpContext;

public void Save(UserLoginModel user)
{
  _httpContext.Session[SessionKey] = user;
}

I need to get the value of this Session UserLogin.User_id from jQuery. I can Access

var variable = '@Session["UserLogin"]';

But it gives me the value that it is class data type:

UserLoginModel

How can I get a specific value like User_id?

Thanks

Tetsuya Yamamoto · Accepted Answer · 2017-07-31 01:38:17Z

Let's start with session value assignment:

var variable = '@Session["UserLogin"]';

From what I tested, this direct assignment to JS string returned full class name of UserLoginModel. To extract member class values from a stored model class in session variable, you need to declare local variable to hold each member's value in view page with same data type & cast the session as model class name like this:

@{
    long user_id = 0; // local variable to hold User_id value

    // better than using (UserLoginModel)Session["UserLogin"] which prone to NRE
    var userLogin = Session["UserLogin"] as UserLoginModel;

    // avoid NRE by checking against null
    if (userLogin != null)
    {
        user_id = userLogin.User_id;
    }
}

<script type="text/javascript">
    var variable = '@user_id'; // returns '1'
</script>

Note that ViewBag, ViewData & strongly-typed viewmodel using @model directive are more preferred ways over session variable to pass model values into view page.

Live example: .NET Fiddle Demo

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