无法创建身份类的对象（UserManager和RoleManager）

Question

我正在开发3层体系结构应用程序，因此我将UserManager和RoleManager添加到数据访问层的UnitOfWork中。但是，当我尝试创建UserManager和RoleManager类的对象时，出现此错误：

There is no argument given that corresponds to the required formal parameter 'optionsAccessor' 
of 'UserManager<IdentityUser>.UserManager(IUserStore<IdentityUser>, IOptions<IdentityOptions>, 
IPasswordHasher<IdentityUser>, IEnumerable<IUserValidator<IdentityUser>>, 
IEnumerable<IPasswordValidator<IdentityUser>>, ILookupNormalizer, IdentityErrorDescriber, 
IServiceProvider, ILogger<UserManager<IdentityUser>>)'

There is no argument given that corresponds to the required formal parameter 'roleValidators'
 of 'RoleManager<IdentityRole>.RoleManager(IRoleStore<IdentityRole>, IEnumerable<IRoleValidator<IdentityRole>>, 
ILookupNormalizer, IdentityErrorDescriber, ILogger<RoleManager<IdentityRole>>)'

我的UnitOfWork类的一部分

    public class IdentityUnitOfWork : IUnitOfWork
    {
        private UserManager<IdentityUser> _userManager;
        private RoleManager<IdentityRole> _roleManager;
        private ApplicationContext _context;

        public IdentityUnitOfWork(ApplicationContext context)
        {
            _userManager = new UserManager<IdentityUser>(context);// error 1
            _roleManager = new RoleManager<IdentityRole>(context);// error 2
            _context = context;
        }
    }

更新

[当我尝试创建自己的RoleManager和UserManager类时，出现相同的错误。

我的ApplicationRole类

    public class ApplicationRole : IdentityRole
    {

    }

我的ApplicationRoleManager类

    public class ApplicationRoleManager : RoleManager<ApplicationRole>
    {
        public ApplicationRoleManager(RoleStore<ApplicationRole> store)
                    : base(store)// error in a here (in a base)
        {

        }
    }

Answer 1

您已将身份服务添加到IoC容器。因此，您可以像这样使用依赖注入到UnitOfWork的构造函数中：

public class IdentityUnitOfWork : IUnitOfWork
{
    private UserManager<IdentityUser> _userManager;
    private RoleManager<IdentityRole> _roleManager;
    private ApplicationContext _context;

    public IdentityUnitOfWork(ApplicationContext context, 
        UserManager<IdentityUser> userManager,
        RoleManager<IdentityRole> roleManager)
    {
        _userManager = userManager;
        _roleManager = roleManager;
        _context = context;
    }
}

Answer 2

代替直接将上下文传递给用户和角色管理器，您需要创建用户和角色存储，并像这样将上下文传递给用户和角色存储

 public class IdentityUnitOfWork : IUnitOfWork
    {
        private UserManager<IdentityUser> _userManager;
        private RoleManager<IdentityRole> _roleManager;
        private DbContext _context;

        public IdentityUnitOfWork(DbContext context)
        {
            _userManager = new UserManager<IdentityUser>(new UserStore<IdentityUser>(context));
            _roleManager = new RoleManager<IdentityRole>(new RoleStore<IdentityRole>(context));
            _context = context;
        }
    }

错误也建议使用用户存储和角色存储