尝试为Asp.Net mvc 5中的用户和角色播种数据时出错

当我尝试使用用户和角色的种子数据更新数据库时，我收到“对一个或多个实体的验证失败。有关更多详细信息，请参见'EntityValidationErrors'属性。” 错误。角色已创建，我可以在db表中看到它们，但是没有创建具有admin角色的用户。此外，角色也不会显示在创建和编辑用户视图中。

用于创建用户的ViewModel：

public class InsertUser
{
    [Required]
    [StringLength(50, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 2)]
    [Display(Name = "First Name")]
    [RegularExpression(@"^[A-Z]+[a-zA-Z''-'\s]*$", ErrorMessage = "The {0} must start with upper letter and contain only alphabetical letters")]//requires the first character to be upper case and the remaining characters to be alphabetical
    public string FirstName { get; set; }

    [Required]
    [StringLength(50, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 2)]
    [Display(Name = "Last Name")]
    [RegularExpression(@"^[A-Z]+[a-zA-Z''-'\s]*$", ErrorMessage = "The {0} must start with upper letter and contain only alphabetical letters")]
    public string LastName { get; set; }

    [Required]
    [EmailAddress]
    [Display(Name = "Email")]
    public string Email { get; set; }

    [Display(Name = "User Name")]
    public string UserName { get; set; }

    [Required]
    [StringLength(100, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 6)]
    [DataType(DataType.Password)]
    [Display(Name = "Password")]
    public string Password { get; set; }

    [DataType(DataType.Password)]
    [Display(Name = "Confirm new password")]
    [Compare("Password", ErrorMessage = "The new password and confirmation password do not match.")]
    public string ConfirmPassword { get; set; }

    public List<CheckBoxItem> Roles { get; set; }
}

public class CheckBoxItem
{
    public string Id { get; set; }
    public string Text { get; set; }
    public bool Checked { get; set; }
}

用于编辑用户的ViewModel：

public class EditUser
{
    public EditUser()
    {
        Roles = new List<CheckBoxItem>();
    }

    [Key]
    public string Id { get; set; }

    [Display(Name = "User Name")]
    public string UserName { get; set; }

    [Required]
    [StringLength(50, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 2)]
    [Display(Name = "First Name")]
    [RegularExpression(@"^[A-Z]+[a-zA-Z''-'\s]*$", ErrorMessage = "The {0} must start with upper letter and contain only alphabetical letters")]
    public string FirstName { get; set; }

    [Required]
    [StringLength(50, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 2)]
    [Display(Name = "Last Name")]
    [RegularExpression(@"^[A-Z]+[a-zA-Z''-'\s]*$", ErrorMessage = "The {0} must start with upper letter and contain only alphabetical letters")]
    public string LastName { get; set; }

    [Required]
    [EmailAddress]
    [Display(Name = "Email")]
    public string Email { get; set; }        

    public List<CheckBoxItem> Roles { get; set; }
}

我创建了自己的ViewModels来编辑和创建用户，因为这种情况是这样的，必须从管理员创建用户，因此为了使内容分开，我创建了自己的ViewModel，与AccountViewModel不同。但是除此之外，还可以像使用个人用户帐户，电子邮件，用户名和密码在ASp.Net MVC中开箱即用一样创建一个简单的用户。管理员有权添加更多详细信息，例如名字和姓氏并分配角色。

创建（和编辑）视图：

...
 <div class="form-group">
        @Html.LabelFor(model => model.Roles, new { @class = "control-label col-md-2" })
        <div class="col-md-10">
            @Html.CheckBoxListFor(model => model.Roles
            , model => model.Roles
            , model => model.Id
            , model => model.Text
            , model => model.Checked
            , model => new { @class = "checkbox-inline" })
        </div>
    </div>
...

我为ChechBoxListFor html帮助程序安装了MvcCheckBoxList nuget。

用于创建用户的get操作方法：

public ActionResult Create()
    {
        var items = new InsertUser();
        items.Roles = _roleManager.Roles.Select(x => new CheckBoxItem { Id = x.Id, Text = x.Name, Checked = false }).ToList();
        return View(items);
    }

以及Configuration类，种子方法：

if (!context.Roles.Any(r => r.Name == "admin"))
        {
            var store = new RoleStore<IdentityRole>(context);
            var manager = new RoleManager<IdentityRole>(store);
            var role = new IdentityRole { Name = "admin" };

            manager.Create(role);
        }

        if (!context.Roles.Any(r => r.Name == "user"))
        {
            var store = new RoleStore<IdentityRole>(context);
            var manager = new RoleManager<IdentityRole>(store);
            var role = new IdentityRole { Name = "user" };

            manager.Create(role);
        }

        if (!context.Users.Any(u => u.UserName == "admin"))
        {
            var store = new UserStore<ApplicationUser>(context);
            var manager = new UserManager<ApplicationUser>(store);
            var user = new ApplicationUser { UserName = "admin", Email="[email protected]" };

            manager.Create(user, "password123");
            manager.AddToRole(user.Id, "admin");
        }

仅作参考，我输入密码要求至少6个字母，并评论了其他要求，例如RequiredLowercase，RequieredUppercase，RequireNonLetterOrDigit，RequireDigit。

因此，有人可以帮助我解决此问题，创建管理员用户以及在编辑和创建视图中显示角色吗？