使用身份的实体框架-尝试更新AspNetUsers表中的用户

我很难弄清楚如何AspNetUsers使用实体框架和身份来更新/修改表中的用户。我收到一条错误消息：

“实体类型ManagerUserViewModel不是当前上下文模型的一部分。”

这是有意义的，因为我不提ManagerUserViewModel在ApplicationDbContext这我使用。但是我应该创建一个与之相似的新上下文ApplicationDBContext吗？还是我以某种方式将我添加ManagerUserViewModel到ApplicationDBContext？

这是我的控制器方法，当单击“保存”时正在执行更新：

public ActionResult EditUser([Bind(Include = "UserID, Email, UserName, Roles, RoleID, RoleName")] ManagerUserViewModel model)
    {
        if (ModelState.IsValid)
        {
            using (var context = new ApplicationDbContext())
            {
                var store = new UserStore<ApplicationUser>(context);
                var manager = new UserManager<ApplicationUser>(store);
                ApplicationUser user = new ApplicationUser();
                user.Email = model.Email;
                user.UserName = model.UserName;

                if (model.UserID == "")
                {
                    // Since it didn't have a UserID, we assume this is a new User

                    Task.WaitAny(manager.CreateAsync(user, "Password12"));
                }
                else
                {
                    // Since EF doesn't know about this product (it was instantiated by
                    // the ModelBinder and not EF itself, we need to tell EF that the
                    // object exists and that it is a modified copy of an existing row

                    context.Entry(model).State = EntityState.Modified;

                    Task.WaitAny(manager.UpdateAsync(user));
                }
                if (model.RoleName != null && model.RoleName != "")
                {
                    Task.WaitAny(manager.AddToRoleAsync(model.UserID, model.RoleName));
                }
                Task.WaitAny(context.SaveChangesAsync());
                return RedirectToAction("ControlPanel");
            }
        }
        return View(model);
    }

这是我的ManagerUserViewModel：

public class ManagerUserViewModel
{
    public String UserID { get; set; }
    public String Email { get; set; }
    public String UserName { get; set; }

    [Display(Name = "Role(s)")]
    public IEnumerable<String> Roles { get; set; }

    public String RoleID { get; set; }

    public String RoleName { get; set; }

    public IEnumerable<SelectListItem> RoleList { get; set; }

    public static IEnumerable<SelectListItem> getRoles(string id = "")
    {
        using (var db = new ApplicationDbContext())
        {

            List<SelectListItem> list = new List<SelectListItem>();
            foreach (var role in db.Roles)
            {
                SelectListItem sli = new SelectListItem { Value = role.Name, Text = role.Name};
                list.Add(sli);
            }

            return list;
        }
    }

    public static String getRoleID(string role)
    {
        using (var db = new IdentityDbContext())
        {
            string roleID = db.Roles.Where(r => r.Name == role).First().Id;
            return roleID;
        }
    }
}

这是我的ApplicationDBContext：

public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()
        : base("DefaultConnection", throwIfV1Schema: false)
    {
    }

    public DbSet<RegisterViewModel> RegisterUsers { get; set; }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }

}

让我知道是否需要其他代码。

编辑：根据史蒂夫的评论，我尝试创建一个新的上下文。

public class ManageUserDbContext : IdentityDbContext<ApplicationUser>
{
    public ManageUserDbContext()
        : base("DefaultConnection", throwIfV1Schema: false)
    {
    }

    public DbSet<ManagerUserViewModel> Users { get; set; }

    public static ManageUserDbContext Create()
    {
        return new ManageUserDbContext();
    }

}

然后在Controller方法中，将我的using上下文切换为new ManageUserDbContext()。现在，它不会出错，但仍不会更新用户。