access cookie in _Layout.cshtml in ASP.NET Core

Question

I'm trying to store an authentication-key into my cookies when login succeeded:

HttpContext.Response.Cookies.Append("Bearer", accessToken, cookieMonsterOptions); 

So in the controller-class this works. I can easily create and read my cookies. But now I want to check and, if it exists, read the value of a cookie in my _Layout.cshtml and show the name of the logged in user - or the link to login. But how can I read my cookies in the partial _Layout.cshtml?

string value = HttpContext.Request.Cookies.Get("Bearer"); 

doesn't work. It tries to add either System.Web to my usings or says HttpContext is static and needs a reference to access Request.

Any suggestions or ideas?

Answer 1

In ASP.NET Core there is no concept of a static HttpContext any more. Dependency Injection rules in the new Microsoft Web Framework. Regarding views there is the @inject directive for accessing registered services like IHttpContextAccessor service (https://docs.asp.net/en/latest/mvc/views/dependency-injection.html).

Using the IHttpContextAccessor you can get the HttpContext and the cookie information like in this example.

 @inject Microsoft.AspNetCore.Http.IHttpContextAccessor HttpContextAccessor   @{     foreach (var cookie in HttpContextAccessor.HttpContext.Request.Cookies)     {         @cookie.Key  @cookie.Value     } } 

Answer 2

So I found the solution, if anyone needs it, too:

Add into ConfigureServices the service for IHttpContextAccessor

public void ConfigureServices(IServiceCollection services) {     services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>(); } 

into your _Layout.cs inject IHttpContextAccessor:

@inject IHttpContextAccessor httpContextaccessor 

access the cookies with

@Html.Raw(httpContextaccessor.HttpContext.Request.Cookies["Bearer"])