自定义 UserManager 总是返回 null

Question

我正在尝试创建自己的 UserManager 扩展自原始版本，当我通过电子邮件进行搜索时，找不到用户。但是如果我从上下文中进行搜索，如果我找到了用户（参见Get 方法）。为了验证它是否真的很好实现，我重写了FindByEmailAsync 方法并且它确实被调用了，但我不知道为什么用户找不到它。一些帮助？谢谢！

public void ConfigureServices(IServiceCollection servicesCollection)
{
    servicesCollection.AddDbContext<MyIndentityContext>(currentOptions =>
        currentOptions.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

    servicesCollection.AddIdentity<ApplicationUser, ApplicationRole>()
        .AddEntityFrameworkStores<MyIndentityContext>()
        .AddRoleStore<ApplicationRoleStore>()
        .AddUserStore<ApplicationUserStore>()
        .AddUserManager<ApplicationUserManager>()
        .AddRoleManager<ApplicationRoleManager>()
        .AddSignInManager<ApplicationSignInManager>()
        .AddDefaultTokenProviders();

        ...

        ...

        ...
}

public class MyIndentityContext : IdentityDbContext<ApplicationUser, ApplicationRole, string>
{
    private readonly IConfiguration _configuration;

    private readonly IHttpContextAccessor _httpContextAccessor;

    public MyIndentityContext(DbContextOptions dbContextOptions, IHttpContextAccessor httpContextAccessor,
        IConfiguration configuration)
        : base(dbContextOptions)
    {
        _configuration = configuration;
        _httpContextAccessor = httpContextAccessor;
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        base.OnModelCreating(modelBuilder);

        modelBuilder.HasDefaultSchema("Sample.API");
    }

}

public class ApplicationRoleManager : RoleManager<ApplicationRole>
{
    public ApplicationRoleManager(IRoleStore<ApplicationRole> roleStore,
        IEnumerable<IRoleValidator<ApplicationRole>> roleValidators, ILookupNormalizer keyNormalizer,
        IdentityErrorDescriber errors, ILogger<ApplicationRoleManager> logger) : base(roleStore,
        roleValidators,
        keyNormalizer, errors, logger)
    {
    }
}

public class ApplicationSignInManager : SignInManager<ApplicationUser>
{
    public ApplicationSignInManager(UserManager<ApplicationUser> userManager, IHttpContextAccessor contextAccessor,
        IUserClaimsPrincipalFactory<ApplicationUser> claimsFactory, IOptions<IdentityOptions> optionsAccessor,
        ILogger<ApplicationSignInManager> logger, IAuthenticationSchemeProvider schemes) : base(userManager,
        contextAccessor, claimsFactory, optionsAccessor, logger, schemes)
    {
    }
}

public class ApplicationUserManager : UserManager<ApplicationUser>
{
    public ApplicationUserManager(IUserStore<ApplicationUser> userStore, IOptions<IdentityOptions> optionsAccessor,
        IPasswordHasher<ApplicationUser> passwordHasher,
        IEnumerable<IUserValidator<ApplicationUser>> userValidators,
        IEnumerable<IPasswordValidator<ApplicationUser>> passwordValidators, ILookupNormalizer keyNormalizer,
        IdentityErrorDescriber errors, IServiceProvider services, ILogger<ApplicationUserManager> logger) :
        base(userStore, optionsAccessor, passwordHasher, userValidators, passwordValidators, keyNormalizer, errors,
            services, logger)
    { }

    // Custom implementation to check if you are really calling the method
    public override Task<ApplicationUser> FindByEmailAsync(string email)
    {
        return Task.Run(() => new ApplicationUser
        {
            UserName = "A_NAME"
        });
    }
}

public class ApplicationRoleStore : RoleStore<ApplicationRole, MyIndentityContext>
{
    public ApplicationRoleStore(MyIndentityContext dbContext, IdentityErrorDescriber identityErrorDescriber)
        : base(dbContext, identityErrorDescriber)
    {}
}

public class ApplicationUserStore : UserStore<ApplicationUser, ApplicationRole, MyIndentityContext, string>
{
    public ApplicationUserStore(MyIndentityContext dbContext, IdentityErrorDescriber identityErrorDescriber)
        : base(dbContext, identityErrorDescriber)
    {}

}

public class ApplicationUser : IdentityUser {}

public class ApplicationRole : IdentityRole
{
    public ApplicationRole() { }

    public ApplicationRole(string roleName) : base(roleName) { }

    public ApplicationRole(string roleName, string roleDescription) : base(roleName)
    {
        Description = roleDescription;
    }

}

[Authorize]
[ApiController]
[Route("api/[controller]")]
[EnableCors(CORS.AllowSpecificOrigins)]

public class UserController : BaseController
{
    private readonly ApplicationUserManager _applicationUserManager;

    public UserController(ApplicationUserManager applicationUserManager)
    {
        _applicationUserManager = applicationUserManager;
    }

     // GET: api/User/5
    [HttpGet("{id}")]
    public async Task<UserDTO> Get(int id)
    {

            var currentUser = await _applicationUserManager.FindByEmailAsync("example@example.com"); ==> RETURN NULL!

            var otherUser = _indentityContext.Users.Where(x => x.Email == "example@example.com"); ==> RETURN CORRECT USER!

            return currentUser;

    }

}

Answer 1

注意：此答案引用了您的 Github 复制中显示的代码和值。

当您调用UserManager.FindByEmailAsync 时，您传递给方法的值被规范化 - 默认情况下，这种规范化将值转换为大写。然后使用该标准化值搜索AspNetUsers 表中的NormalizedEmail 列。

在您的 MyIndentityContext.OnModelCreating 方法中，您有以下代码：

modelBuilder.Entity<ApplicationUser>().HasData(
    new ApplicationUser
    {
        Email = "a_mail@hotmail.com"
    });

由于您在此处控制数据并仅设置Email，因此未设置数据库中的NormalizedEmail 值（它是null）。这意味着当您使用UserManager.FindByEmailAsync 并在NormalizedEmail 列中查找A_MAIL@HOTMAIL.COM 时，没有匹配项。但是，当您直接使用DbSet 并查看Email 列时，您可以找到a_mail@hotmail.com 的匹配记录。

要解决此问题，我建议您不要使用HasData 为您的用户播种，而是在应用程序的种子方法中使用UserManager.CreateAsync 方法。这将确保规范化和其他相关处理在记录被持久化到数据库之前发生。