尝试登录时 PasswordSignInAsync returns null

Question

我是第一次使用 razor pages，我想尝试为一个学校项目实现身份。身份令人困惑，我需要一些帮助来诊断这里的问题。

我目前正在使用 visual studio 2022、.NET6、razor pages、Identity 和 entity framework。

我是 razor pages 的初学者。

问题描述：这行代码 returns null 具有正确的用户凭据。电子邮件和密码凭据正确
var result = await _signInManager.PasswordSignInAsync(Input.Email, Input.Password, Input.RememberMe, lockoutOnFailure: false); 结果=空

错误信息 ArgumentNullException:Value 不能为 Null。 (参数'Value')

这是我的登录码

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

            if (ModelState.IsValid)
            {
                // This doesn't count login failures towards account lockout
                // To enable password failures to trigger account lockout, set lockoutOnFailure: true
                //Claim aclaim = new Claim("LoggedIn", Input.Email);
                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();
        }

This is the error 错误堆栈

```    System.ArgumentNullException: Value cannot be null. (Parameter 'value')
   at System.Security.Claims.Claim..ctor(String type, String value, String valueType, String issuer, String originalIssuer, ClaimsIdentity subject, String propertyKey, String propertyValue)
   at System.Security.Claims.Claim..ctor(String type, String value)
   at Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory`1.GenerateClaimsAsync(TUser user)
   at Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory`2.GenerateClaimsAsync(TUser user)
   at Microsoft.AspNetCore.Identity.UserClaimsPrincipalFactory`1.CreateAsync(TUser user)
   at Microsoft.AspNetCore.Identity.SignInManager`1.CreateUserPrincipalAsync(TUser user)
   at Microsoft.AspNetCore.Identity.SignInManager`1.SignInWithClaimsAsync(TUser user, AuthenticationProperties authenticationProperties, IEnumerable`1 additionalClaims)
   at Microsoft.AspNetCore.Identity.SignInManager`1.SignInOrTwoFactorAsync(TUser user, Boolean isPersistent, String loginProvider, Boolean bypassTwoFactor)
   at Microsoft.AspNetCore.Identity.SignInManager`1.PasswordSignInAsync(TUser user, String password, Boolean isPersistent, Boolean lockoutOnFailure)
   at Microsoft.AspNetCore.Identity.SignInManager`1.PasswordSignInAsync(String userName, String password, Boolean isPersistent, Boolean lockoutOnFailure)
   at InfocommSolutionsProject.Areas.Identity.Pages.Account.LoginModel.OnPostAsync(String returnUrl) in C:\Users\Zade\source\repos\InfocommSolutionsProject\InfocommSolutionsProject\Areas\Identity\Pages\Account\Login.cshtml.cs:line 117
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.ExecutorFactory.GenericTaskHandlerMethod.Convert[T](Object taskAsObject)
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.ExecutorFactory.GenericTaskHandlerMethod.Execute(Object receiver, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeHandlerMethodAsync()
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeNextPageFilterAsync()
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.Rethrow(PageHandlerExecutedContext context)
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.RazorPages.Infrastructure.PageActionInvoker.InvokeInnerFilterAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|25_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)```

我在网上搜索过的解决方法

安全戳不为空。填入数据库
没有任何内容覆盖 ID 属性（我认为）

我觉得是什么问题
根据错误堆栈，它说我的声明构造函数是 null.But 我还没有在我当前的 project.Is 中实现任何声明有任何方法可以禁用身份中的声明 framework.I would like to use roles反而。为什么 signinManager 试图访问声明构造函数？ Here is the claims constructor 很奇怪，我没有在项目中实现任何声明。

我没有角色、主张或任何政策。我对如何实施它仍然有些困惑。如果问题没有得到解决我会因为时间关系没有身份做学校的project

如何解决这个问题？如果我必须实施声明，我应该如何在剃须刀页面中实施它？所有教程都在 MVC 上。

请帮忙。谢谢你，祝你有愉快的一天。

Answer 1

好的，我解决了这个问题。显然我的帐户模型包含用户名。该用户名覆盖了身份预配置的 aspnetusers 用户名列。我从帐户模型和 added-migration 和 update-database.

中删除了用户名

基本上，帐户模型用户名字段覆盖了 pre-existing ASPNETUSER 用户名列。

尝试登录时 PasswordSignInAsync returns null

PasswordSignInAsync returns null when attempting to Login

c#

authentication

asp.net-identity

razor-pages

claims