如何在ASP.NET Core RazorPage中的布局页面中接收cookie？

Question

我在ASP.NET Core RazorPage中创建登录页面，以下代码是： 登录页面：

 List<Claim> claims = new List<Claim>()
            {
                new Claim("Test","Test"),
                new Claim(ClaimTypes.NameIdentifier as string,user.UserID.ToString()  as string),
                new Claim(ClaimTypes.Name,user.UserName),
                new Claim(ClaimTypes.Role as string,user.UserRole.ToString() as string)
            };

            var identity = new ClaimsIdentity(claims, CookieAuthenticationDefaults.AuthenticationScheme);
            var claimPrincipal = new ClaimsPrincipal(identity);
            HttpContext.SignInAsync(claimPrincipal);
            return RedirectToPage("../Index");

我的_layout页面就是这样 _layout：

                if (???????????)
                    {
                        <div>@User.Identity.Name</div>
                        <ul class="navbar-nav d-flex justify-content-end">
                            <li class="nav-item">
                                <a class="btn btn-primary" asp-page="/Auth/Logout">Logout</a>
                            </li>
                        </ul>
                    }
                    else
                    {
                        <ul class="navbar-nav d-flex justify-content-end flex-grow-1">
                            <li class="nav-item">
                                <a class="btn btn-primary" asp-page="/Auth/login">Login</a>
                            </li>
                            <li class="nav-item">
                                <a class="btn" asp-page="/Auth/Register">Register</a>
                            </li>
                        </ul>
                    }

问题是： 我应该放什么而不是问号？

Answer 1

确定用户是否已成功登录，

在_layout中的代码下面尝试：

@if (User.Identity.IsAuthenticated)

在我的startup.cs

services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
                .AddCookie();

结果中：