Net 6 using session in a custom class

Question

I can easily work with session in a page model like:

            string SessionKeyName = "logged";
            if (string.IsNullOrEmpty(HttpContext.Session.GetString(SessionKeyName)))
            {
                HttpContext.Session.SetString(SessionKeyName, "notlogged");
                //ViewData["mt"] = "notlogged";
                Response.Redirect("./login");
            }

But if I try to use session in a custom class I get an error:

Severity Code Description Project File Line Suppression State
Error CS0120 An object reference is required for the non-static field, method, or property 'HttpContext.Session' RazorPagesMovie C:\Users\Owner\source\repos\RazorPagesMovie\RazorPagesMovie\Helpers\Chk.cs 20 Active

How would I implement session in a custom class?

Answer 1

it would be simpler to just pass session to the class:

using Microsoft.AspNetCore.Http;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.AspNetCore.Session;


 namespace RazorPagesMovie.Helpers
 {
     public class Chk
     {
         ISession session;

         public Chk(ISession session)
         {
             this.session = session;
         }

         public void Foo()
         {
             session?.SetString("Name", "Bobby");
             session?.SetInt32("Age", 773);
         }

         public void getFoo()
         {
             session?.GetString("Name");
             session?.SetInt32("Age", 773);
         }
     }
 }

in a page you create

Chk chk = new Chk(HttpContext.Session);

or create a session extension class

public static class SessionExtensions
{
     public static string? GetFoo (this ISession session) => return session["foo"];
     public static void SetFoo(this ISession session, string value) => session["foo"] = value; 
}

and use

var foo = HttpContext.Session?.GetFoo();

Answer 2

All I want to do is find out if a session key is set or not by returning true or false.

But I want to do this from custom class where I can use anywhere, I even prefer a static method.

Then I can do a if true do something, else do something else.

I want to be able to call the custom class and function from any of the page models.

Seems as though there would be an easy way.

Answer 3

I will try it tomorrow, meanwhile I found an S.O. example, but can't call it. No errors in class:

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Session;


namespace RazorPagesMovie.Helpers
{
    public class Chk
    {
        IHttpContextAccessor accessor;

        public Chk(IHttpContextAccessor accessor)
        {
            this.accessor = accessor;

        }

        public void Foo()
        {
            var httpContext = accessor.HttpContext;
            httpContext?.Session.SetString("Name", "Bobby");
            //httpContext?.Session.SetInt32("Age", 773);
        }

        public void getFoo()
        {
            var httpContext = accessor.HttpContext;
            httpContext?.Session.GetString("Name");
            //httpContext?.Session.SetInt32("Age", 773);
        }
    }
}

But in page model where I have:

Chk mychk = new Chk();

It's expecting parameters, I have no idea what parameters to sent. The error is:

Severity Code Description Project File Line Suppression State
Error CS7036 There is no argument given that corresponds to the required formal parameter 'accessor' of 'Chk.Chk(IHttpContextAccessor)' RazorPagesMovie C:\Users\Owner\source\repos\RazorPagesMovie\RazorPagesMovie\Pages\pets\login.cshtml.cs 49 Active

What parameters do I send?

Answer 4

Also tried the code, got:

Severity Code Description Project File Line Suppression State
Error CS0103 The name '_myclass' does not exist in the current context RazorPagesMovie C:\Users\Owner\source\repos\RazorPagesMovie\RazorPagesMovie\Pages\pets\index.cshtml.cs 42 Active

So tried new keyword:

MyClass myclass = new MyClass();

//and
string SessionKeyName = "logged";
var result = myclass.getValue(SessionKeyName);

But got another error:

Severity Code Description Project File Line Suppression State
Error CS1061 'MyClass' does not contain a definition for 'getValue' and no accessible extension method 'getValue' accepting a first argument of type 'MyClass' could be found (are you missing a using directive or an assembly reference?) RazorPagesMovie C:\Users\Owner\source\repos\RazorPagesMovie\RazorPagesMovie\Pages\pets\index.cshtml.cs 42 Active

Answer 5

ZhiLv-MSFT, Bruce-SqlWork

Closer, now only error is in this part:

        public DefaultModel(MyClass myClass, IHttpContextAccessor httpContextAccessor)
        {
            _myClass = myClass;
            _httpcontextAccessor = httpContextAccessor;
        }

Error is:

CS1520 Method must have a return type RazorPagesMovie C:\Users\Owner\source\repos\RazorPagesMovie\RazorPagesMovie\Pages\pets\index.cshtml.cs 23 Active

Bruce-SqlWork I am looking over your code also.