I'm trying to access session storage in a razor view for a .net core 2.0 project. Is there any equivalent for @Session["key"] in a .net 2.0 view? I have not found a working example of how to do this - I am getting this error using the methods I have found:
An object reference is required for the non-static field, method, or propery HttpContext.Session
View:
@using Microsoft.AspNetCore.Http
[HTML button that needs to be hidden/shown based on trigger]
@section scripts {
<script>
var filteredResults = '@HttpContext.Session.GetString("isFiltered")';
</script>
}
Startup.cs:
public void ConfigureServices(IServiceCollection services)
{
services.AddSession(options => {
options.IdleTimeout = TimeSpan.FromMinutes(30);
});
services.AddMvc();
// Added - uses IOptions<T> for your settings.
// Added - replacement for the configuration manager
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
//exception handler stuff
//rewrite http to https
//authentication
app.UseSession();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
So this is very simple. Go to the view where you want to retrieve the value of session. Add a Hidden field there like this: <input type="hidden" value="@Session["username"]" id="myHiddenVar" />
Session state. Session state is an ASP.NET Core scenario for storage of user data while the user browses a web app. Session state uses a store maintained by the app to persist data across requests from a client. The session data is backed by a cache and considered ephemeral data.
You can do dependency injection in views, in ASP.NET Core 2.0 :)
You should inject IHttpContextAccessor
implementation to your view and use it to get the HttpContext
and Session
object from that.
@using Microsoft.AspNetCore.Http @inject IHttpContextAccessor HttpContextAccessor <script> var isFiltered = '@HttpContextAccessor.HttpContext.Session.GetString("isFiltered")'; alert(isFiltered); </script>
This should work assuming you have the relevant code in the Startup.cs
class to enable session.
public void ConfigureServices(IServiceCollection services) { services.AddSession(s => s.IdleTimeout = TimeSpan.FromMinutes(30)); services.AddMvc(); } public void Configure(IApplicationBuilder app, IHostingEnvironment env) { app.UseSession(); app.UseMvc(routes => { routes.MapRoute( name: "default", template: "{controller=Home}/{action=Index}/{id?}"); }); }
To set session in a controller, you do the same thing. Inject the IHttpContextAccessor
to your controller and use that
public class HomeController : Controller { private readonly ISession session; public HomeController(IHttpContextAccessor httpContextAccessor) { this.session = httpContextAccessor.HttpContext.Session; } public IActionResult Index() { this.session.SetString("isFiltered","YES"); return Content("This action method set session variable value"); } }
Use Session appropriately. If you are trying to pass some data specific to the current page, (ex : Whether the grid data is filtered or not , which is very specific to the current request), you should not be using session for that. Consider using a view model and have a property in that which you can use to pass this data. You can always pass these values to partial views as additional data through the view data dictionary as needed.
Remember, Http is stateless. When adding stateful behavior to that, make sure you are doing it for the right reason.
put this at the top of the razor page
@using Microsoft.AspNetCore.Http;
then you can easily access session variables like that
<h1>@Context.Session.GetString("MyAwesomeSessionValue")</h1>
if you get null values , make sure you include that in your Startup.cs
& make sure that options.CheckConsentNeeded = context is set to false
For more information about CheckConsentNeeded check this GDPR
public void ConfigureServices(IServiceCollection services)
{
services.Configure<CookiePolicyOptions>(options =>
{
// This lambda determines whether user consent for non-essential cookies is needed for a given request.
//options.CheckConsentNeeded = context => true;
options.CheckConsentNeeded = context => false;
options.MinimumSameSitePolicy = SameSiteMode.None;
});
services.AddDistributedMemoryCache();
services.AddSession(options =>
{
// Set session timeout value
options.IdleTimeout = TimeSpan.FromSeconds(30);
options.Cookie.HttpOnly = true;
});
}
Also make sure you are adding app.UseSession(); to your app pipeline in Configure function
for more info about Sessions in Asp.net Core check this link Sessions in Asp.net Core
tested on .net core 2.1
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