Como o usuário mostrar o MVC Controller Core 3.1
string userName = _httpContextAccessor.HttpContext.User.Identity.Name;
Expensive Echidna
string userName = _httpContextAccessor.HttpContext.User.Identity.Name;public string LoggedInUser => User.Identity.Name;services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();private readonly IHttpContextAccessor _httpContextAccessor;
//constructor then
_httpContextAccessor = httpContextAccessor;