How do I grab the latest, most immediate user from .NET Core?

This guy has a pretty good cheat sheet. Inside ConfigureServices in Startup.cs put:

services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

 
 

The rest of this code is Controller-flavored. Have a private field at a given Controller.

private readonly IHttpContextAccessor _httpContextAccessor;

 
 

At the constructor:

public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options,
      IHttpContextAccessor httpContextAccessor) : base(options)
{
   _httpContextAccessor = httpContextAccessor;

 
 

When you use it, loop in...

using System.Security.Claims;

 
 

...and then have:

var userId =
      _httpContextAccessor.HttpContext.User.FindFirst(ClaimTypes.NameIdentifier).Value;