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I’m trying to use sessions to store variables in .net6, I already configured program.cs but the session still not storing the values, using .net6 core with c#.

using Microsoft.EntityFrameworkCore;
using nsaprojeto.Data;


var builder = WebApplication.CreateBuilder(args);

builder.Services.AddDistributedMemoryCache();

builder.Services.AddSession(options =>
{
    options.IdleTimeout = TimeSpan.FromSeconds(10);
    options.Cookie.HttpOnly = true;
    options.Cookie.IsEssential = true;
});



// Add services to the container.
builder.Services.AddControllersWithViews();
builder.Services.AddDbContext<ApplicationDbContext>(options =>options.UseSqlServer(
    builder.Configuration.GetConnectionString("DefaultConnection")
    ));

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.UseSession();
app.MapControllerRoute(
    name: "default",
    pattern: "{controller=L_AccessPoint}/{action=Filtros1}");

app.Run();

That’s the code that I’m using to set the session variable, but that isn’t storing the variable, I’m doing something wrong, or forgetting something.

HttpContext.Session.SetString("adad", "dwdwwww");

EDIT:
I have the following object and I need to store that in the session variables, is that possible to do?

    public class L_AccessPoint
    {

        public string ap_name { get; set; }
        public short? zone_id { get; set; }
        public decimal? latitude { get; set; }
        public decimal? longitude { get; set; }
        public string ap_eth_mac { get; set; }
        public DateTime ts { get; set; }
        public short ap_id { get; set; }
        public Byte? type { get; set; }
        public bool Active { get; set; }

    }

2

Answers


  1. In controller, you can do like below:

    public class HomeController : Controller
    {
    
        public IActionResult Index()
        {
            ISession session = HttpContext.Session;
            session.SetString("Username", "ffff");           
            return View();
        }
       
        public IActionResult Privacy()
        {     
            ISession session = HttpContext.Session;
           string username = session.GetString("Username");
            return View();
        }
    
        
    }
    

    result:

    enter image description here

    Update

    Create two methods to save and retrieve a class in a session:

    public static class SessionExtensions
        {
            public static void Set<T>(this ISession session, string key, T value)
            {
                session.SetString(key, JsonConvert.SerializeObject(value));
            }
    
            public static T Get<T>(this ISession session, string key)
            {
                var value = session.GetString(key);
                return value == null ? default(T) : JsonConvert.DeserializeObject<T>(value);
            }
        }
    

    To save and retrieve in a session an object of type List, use methods like below:

     public class HomeController : Controller
        {       
            public IActionResult Index()
            {   //  your list object  
                List<L_AccessPoint> myList = new List<L_AccessPoint>
                {
            new L_AccessPoint(){ ap_name = "Sylvester", zone_id=8,latitude=1, longitude=1},
            new L_AccessPoint(){ ap_name = "Whiskers", zone_id=2,latitude=1, longitude=1 },
            new L_AccessPoint(){ ap_name = "Sasha", zone_id=14 ,latitude=1, longitude=1}
                };
               // To set value in session
                HttpContext.Session.Set<List<L_AccessPoint>>("obj", myList);     
                return View();
            }
           
            public IActionResult Privacy()
            {
               // To Get Value from Session
                List<L_AccessPoint> classCollection = HttpContext.Session.Get<List<L_AccessPoint>>("obj");
                return View();
            }   
        }
    

    Result:

    enter image description here

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  2. You can use objects within your session, but you need to make sure you do a null-check on them (since when not set are defaulting to null)

    var accessPoint = _contextAccessor.HttpContext.Session.Get<I_AccessPoint>("mykey");
    // accessPoint = null when not set
    

    or set like this:

     _contextAccessor.HttpContext.Session.Set<I_AccessPoint>("mykey", objectOfAccessPoint);
    
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