How to get a session value in layout file in ASP.NET 5 MVC6

Question

In ASP.NET 5 MVC 6 Beta 8 I need to read a session variable in in my _Layout.cshtml or alternatively get a reference to the current HttpContext.

Take note: In ASP.NET 5 referencing the Session object has changed significantly from ASP.net 4 as detailed in this question

The Context object has also been renamed to HttpContext between Beta7 and Beta8.

In My current controller I currently save the session variable like this

public IActionResult Index()
{
    HttpContext.Session.SetInt32("Template", (id));
}

In my _Layout.cshtml I need to read the above session variable. I need to reference the current HttpContext somehow e.g

HttpContext.Current.Session.GetInt32("Template");

but I don't know how to the get the current HttpContext in a cshtml file.

Henk Mollema · Accepted Answer · 2015-10-19 11:25:47Z

17

The naming between Context and HttpContext is somewhat confusing. You can access the HttpContext in a view using the Context property:

@{ int x = Context.Session.GetInt32("test"); }

There is also a pending issue at the MVC repo regarding this: https://github.com/aspnet/Mvc/issues/3332

edited Oct 19, 2015 at 11:25

answered Oct 19, 2015 at 11:20

Henk Mollema

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2 Comments

devfric Over a year ago

Thank you for the correct answer and GitHub link. What caught me out was that in the controller it is called HttpContext but in the View it is only Context.

Henk Mollema Over a year ago

Yeah, in beta8 they renamed it to HttpContext in the controller but they 'forgot' about the view.

ditsikts · Accepted Answer · 2015-10-19 11:32:34Z

6

using razor, you can get values this way

@{
var sessionName = new Byte[20];
bool nameOK = Context.Session.TryGetValue("name", out sessionName);

if (nameOK)
{
    string result = System.Text.Encoding.UTF8.GetString(sessionName);
    <p> @result</p>

}
}

change

string result = System.Text.Encoding.UTF8.GetString(sessionName);

to

int intSessionValue = Int32.Parse(sessionName);

or to be safer

int intSessionValue = 0;
bool isConvertOK = Int32.TryParse(TextBoxD1.Text, out intSessionValue);

So you can check if conversion was successful

if (isConvertOK){
   //successful conversion from string to int
}

edited Oct 19, 2015 at 11:32

answered Oct 19, 2015 at 11:23

ditsikts

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