Blazor 额外性。这只是一个默认的用户界面。如果我们可以获得默认UI的源代码，那么我们可以用其他方式实现它。我还在调查这件事。不幸的是，我们不能从脚手架上得到这一点；我们也不能使用Razor认证页面。我仍然没有找到任何东西。我创建此线程是为了向MS索取源代码

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额外性。这只是一个默认的用户界面。如果我们可以获得默认UI的源代码，那么我们可以用其他方式实现它。我还在调查这件事。不幸的是，我们不能从脚手架上得到这一点；我们也不能使用Razor认证页面。我仍然没有找到任何东西。我创建此线程是为了向MS索取源代码

   [AllowAnonymous]
public class LoginModel : PageModel
{
    private readonly UserManager<BlazorApp5User> _userManager;
    private readonly SignInManager<BlazorApp5User> _signInManager;
    private readonly ILogger<LoginModel> _logger;

    public LoginModel(SignInManager<BlazorApp5User> signInManager, 
        ILogger<LoginModel> logger,
        UserManager<BlazorApp5User> userManager)
    {
        _userManager = userManager;
        _signInManager = signInManager;
        _logger = logger;
    }

    [BindProperty]
    public InputModel Input { get; set; }

    public IList<AuthenticationScheme> ExternalLogins { get; set; }

    public string ReturnUrl { get; set; }

    [TempData]
    public string ErrorMessage { get; set; }

    public class InputModel
    {
        [Required]
        [EmailAddress]
        public string Email { get; set; }

        [Required]
        [DataType(DataType.Password)]
        public string Password { get; set; }

        [Display(Name = "Remember me?")]
        public bool RememberMe { get; set; }
    }

    public async Task OnGetAsync(string returnUrl = null)
    {
        if (!string.IsNullOrEmpty(ErrorMessage))
        {
            ModelState.AddModelError(string.Empty, ErrorMessage);
        }

        returnUrl = returnUrl ?? Url.Content("~/");

        // Clear the existing external cookie to ensure a clean login process
        await HttpContext.SignOutAsync(IdentityConstants.ExternalScheme);

        ExternalLogins = (await _signInManager.GetExternalAuthenticationSchemesAsync()).ToList();

        ReturnUrl = returnUrl;
    }

    public async Task<IActionResult> OnPostAsync(string returnUrl = null)
    {
        returnUrl = returnUrl ?? Url.Content("~/");

        if (ModelState.IsValid)
        {
            // This doesn't count login failures towards account lockout
            // To enable password failures to trigger account lockout, set lockoutOnFailure: true
            var result = await _signInManager.PasswordSignInAsync(Input.Email, Input.Password, Input.RememberMe, lockoutOnFailure: false);
            if (result.Succeeded)
            {
                _logger.LogInformation("User logged in.");
                return LocalRedirect(returnUrl);
            }
            if (result.RequiresTwoFactor)
            {
                return RedirectToPage("./LoginWith2fa", new { ReturnUrl = returnUrl, RememberMe = Input.RememberMe });
            }
            if (result.IsLockedOut)
            {
                _logger.LogWarning("User account locked out.");
                return RedirectToPage("./Lockout");
            }
            else
            {
                ModelState.AddModelError(string.Empty, "Invalid login attempt.");
                return Page();
            }
        }

        // If we got this far, something failed, redisplay form
        return Page();
    }
}

@inject NavigationManager NavigationManager

@code{
  [Parameter]
  public string ReturnUrl {get; set;}
  protected override  void OnInitialized()
  {
        ReturnUrl = "~/" + ReturnUrl;
        NavigationManager.NavigateTo($"Identity/Account/Login?returnUrl= 
       {ReturnUrl}", forceLoad:true);
  }
}

    <CascadingAuthenticationState>
    <Router AppAssembly="@typeof(Program).Assembly">
    <Found Context="routeData">
            <AuthorizeRouteView RouteData="@routeData" 
                     DefaultLayout="@typeof(MainLayout)">
                <NotAuthorized>
                   @{
                     var returnUrl = 
                NavigationManager.ToBaseRelativePath(NavigationManager.Uri);
                <RedirectToLogin ReturnUrl="@returnUrl"/>

                }
                </NotAuthorized>
                <Authorizing>
                    Wait...
                </Authorizing>
            </AuthorizeRouteView>
     </Found>
    <NotFound>
            <LayoutView Layout="@typeof(MainLayout)">
                <p>Sorry, there's nothing at this address.</p>
            </LayoutView>
    </NotFound>
 </Router>
</CascadingAuthenticationState>  

@inject NavigationManager NavigationManager

     <AuthorizeView>
      <Authorized>
        <a href="Identity/Account/Manage">Hello, 
        @context.User.Identity.Name!</a>
        <form method="post" action="Identity/Account/LogOut">
            <button type="submit" class="nav-link btn btn-link">Log 
        out</button>
        </form>
      </Authorized>
         <NotAuthorized>
            <a href="Identity/Account/Register">Register</a>
            <a href="Identity/Account/Login">Log in</a>
         </NotAuthorized>
      </AuthorizeView>

<div class="top-row px-4 auth">
    <LoginDisplay />
    <a href="https://docs.microsoft.com/aspnet/" 
         target="_blank">About</a>
</div>