marechai/Marechai/Areas/Identity/Pages/Shared/_LoginPartial.cshtml

@using Marechai.Shared
@using Microsoft.AspNetCore.Identity
@using Microsoft.Extensions.Localization
@inject SignInManager<IdentityUser> SignInManager
@inject UserManager<IdentityUser> UserManager
@inject StringLocalizer<NavMenu> L
@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

<ul class="navbar-nav">
    @if (SignInManager.IsSignedIn(User))
    {
        <li class="nav-item">
            <a class="nav-link text-dark" asp-area="Identity" asp-page="/Account/Manage/Index" title="Manage">@string.Format(L["Hello {0}!"], User.Identity.Name)</a>
        </li>
        <li class="nav-item">
            <form class="form-inline" asp-area="Identity" asp-page="/Account/Logout" asp-route-returnUrl="/" method="post">
                <button type="submit" class="nav-link btn btn-link text-dark">@L["Log out"]</button>
            </form>
        </li>
    }
    else
    {
        <li class="nav-item">
            <a class="nav-link text-dark" asp-area="Identity" asp-page="/Account/Register">@L["Register"]</a>
        </li>
        <li class="nav-item">
            <a class="nav-link text-dark" asp-area="Identity" asp-page="/Account/Login">@L["Log in"]</a>
        </li>
    }
</ul>