Use user ID on a layout in ASP.NET Core - asp.net-core

Question

I'm working on a website, and once the user logs in, he is able to check some workouts.
However, I'm trying to pass the user ID from the layout to other pages, as following
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<li>
<a class="page-scroll">Profile</a>
</li>
<li>
#Html.ActionLink("Workouts", "Index", "Routines", new {id = Model.UserID })
</li>
<li>
<a class="page-scroll">Evaluation</a>
</li>
<li>
<a class="page-scroll">Nutrition</a>
</li>
<li>
<a class="page-scroll">Services</a>
</li>
<li>
<a class="page-scroll">Membership</a>
</li>
</ul>
</div>
And it is not working, I get the following error:
'Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable'
does not contain a definition for 'UserID'
However, my Model does have a UserID property. I can see it working properly on SQL and even if I takeout the HTML.ActionLink from there it works, but when I try to pass that value from the layout it doesn't work.
Any suggestions on how to solve this? I've been reading here and there but no solution so far.
I may be approaching the problem the wrong way. Is there a way to properly pass the ID of the logged in user to multiple Controllers in order to access the information of that user?

Answer 1

So rather than pass the userID around, how about making a service to get the logged in user and then grab whatever data you need from your database? That way you can inject the service wherever you need it.
public interface ILoggedInUserService
{
LoggedInUser GetLoggedInUser();
}
public class LoggedInUserService : ILoggedInUserService
{
private readonly IHttpContextAccessor _httpContextAccessor;
public LoggedInUserService(IHttpContextAccessor httpContextAccessor)
{
_httpContextAccessor = httpContextAccessor;
}
public LoggedInUser GetLoggedInUser()
{
string username = GetLoggedInUsername(_httpContextAccessor.HttpContext.User);
if (!string.IsNullOrEmpty(username))
{
return YourServiceToGetUserData.GetUserData(username);
}
return null;
}
private static string GetLoggedInUsername(ClaimsPrincipal principal)
{
return principal?.FindFirst(ClaimTypes.NameIdentifier)?.Value;
}
}
And then in Startup.cs where you set up your services for dependency injection add this:
services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();