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Get the currently logged-in user's identifier with ASP.NET Core Identity

To get some data about the currently logged-in user, you have to call the Microsoft.AspNetCore.Identity.UserManager<T> service, which implements all the methods you need.

A good practice is to add a private method in your controller, calling this service.

public class AccountController : Controller
{
    private readonly UserManager<ApplicationUser> _userManager;
	
    public AccountController(UserManager<ApplicationUser> userManager)
	{
		_userManager = userManager;
	}
	
	[HttpGet]
	public async Task<string> GetCurrentUserId()
	{
		ApplicationUser usr = await GetCurrentUserAsync();
		return usr?.Id;
	}

    private Task<ApplicationUser> GetCurrentUserAsync() => _userManager.GetUserAsync(HttpContext.User);
}