“ IApplicationBuilder”不包含“ UseSession”的定义

Question

I am building an app using ASP.NET Core 2.0 which was earlier using Core 1.0. After migration everything seems to be working fine but when i try to use Session method app.UseSession() then it throws following error:

'IApplicationBuilder' does not contain a definition for 'UseSession' and no extension method 'UseSession' accepting a first argument of type 'IApplicationBuilder' could be found (are you missing a using directive or an assembly reference?)

I tried installing ASPNETCore.Session package from NuGet but couldn't.

Can anyone help me finding the root cause of the issue?

Answer 1

First inject Session Service into your ConfigureServices method:

services.AddSession(options =>
{
      // Set a short timeout for easy testing.
      options.IdleTimeout = TimeSpan.FromSeconds(2400);
      options.Cookie.HttpOnly = true;
});

then use app.UseSession(); in Configure Method.

In ASP.NET Core Session doesn't support Generic data type you'll need to add this extension

using Microsoft.AspNetCore.Http;
using Newtonsoft.Json;

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);
    }
}

and to use it:

public IActionResult SetDate()
{
    // Requires you add the Set extension method mentioned in the article.
    HttpContext.Session.Set<DateTime>(SessionKeyDate, DateTime.Now);
    return RedirectToAction("GetDate");
}

public IActionResult GetDate()
{
    // Requires you add the Get extension method mentioned in the article.
    var date = HttpContext.Session.Get<DateTime>(SessionKeyDate);
    var sessionTime = date.TimeOfDay.ToString();
    var currentTime = DateTime.Now.TimeOfDay.ToString();

    return Content($"Current time: {currentTime} - "
                 + $"session time: {sessionTime}");
}