Cannot use HttpContext.Session in asp.net core

Question

I've added app.UseSession(); to my startup.Configure and services.AddSession() to my ConfigureServices.

Now if I try to use Session like this:

HttpContext.Session.SetString("Type", tableName);

I get "an object reference is required for the non-static field, method or property, 'HttpContext.Session'"

However, if I try to instantiate it like this: HttpContext context = new HttpContext();

it says: "Cannot create an instance of the abstract class or interface 'HttpContext"

How can I access session?

IQuery.cs

using Microsoft.AspNetCore.Http;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;

namespace AppName.Services
{
    public interface IQuery
    {
        List<Dictionary<string, string>> GetListOfDatabases(string dbName);
    }
    public class InMemoryIquery : IQuery
    {
        public List<Dictionary<string, string>> GetListOfDatabases(string tableName)
        {
        if(tableName != null)
            {
               HttpContext.Session.SetString("Type", tableName);
            }
        }
    }

In what context are you accessing it? See Access HttpContext in ASP.NET Core — stuartd
– stuartd, Commented Feb 21, 2020 at 11:08
I am trying to access it from within a class that inherits an interface — NickyLarson
– NickyLarson, Commented Feb 21, 2020 at 11:11
Can you post the full code where you are trying to access the Session? — Andre.Santarosa
– Andre.Santarosa, Commented Feb 21, 2020 at 11:12
We can help, if you send the full code of that class that accesses the session. — Milad Dastan Zand
– Milad Dastan Zand, Commented Feb 21, 2020 at 11:15

Andre.Santarosa · Accepted Answer · 2020-02-21 11:37:50Z

4

In your class add the IHttpContextAccessor to your constructor and use like this

public class InMemoryIquery : IQuery
{
    private IHttpContextAccessor _httpContextAccessor;

    public InMemoryIquerty(IHttpContextAccessor httpContextAccessor)
    {
        _httpContextAccessor = httpContextAccessor;
    }

    public List<Dictionary<string, string>> GetListOfDatabases(string tableName)
    {
    if(tableName != null)
        {
           _httpContextAccessor.HttpContext.Session.SetString("CalculationType", tableName);
        }
    }
}

In your ConfigureServices add the following line services.AddHttpContextAccessor(); after services.AddControllersWithViews();

answered Feb 21, 2020 at 11:37

Andre.Santarosa

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Milad Dastan Zand · Accepted Answer · 2020-02-21 11:27:59Z

-1

In the outside of this class, Use this to get current HttpContext.

HttpContext context = HttpContext.Current;

Then inject it into the constructor of this class. you must have something like this:

public InMemoryIquery(HttpContext httpContext)
{
   httpContext.Session.SetString("CalculationType", tableName);
}

answered Feb 21, 2020 at 11:27

Milad Dastan Zand

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2 Comments

stuartd Over a year ago

This is not correct in .Net Core, or possibly anywhere. You should use the HttpContextAccessor

Milad Dastan Zand Over a year ago

oh you right in.net core, see this stackoverflow.com/questions/31243068/…

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