.Net Core 控制器编辑 ActionResult 错误

问：

在 HttpGet 上。Select（user => HttpGet 的新 AspNetUser（）' 行 我得到“无法在此范围内声明名为”user“的本地或参数，因为该名称在封闭的本地范围内用于定义本地或参数”

在 HttpPost 上，我在 Listdata listdata 行上收到错误，找不到类型或命名空间名称“Listdata”（是否缺少 using 指令或程序集引用？

    [HttpGet]
      public ActionResult Edit(string id)
      {
        //Get user and return the Edit View
        AspNetUser user = db.Users.Where(u => u.Id == id)
        .Select(user => new AspNetUser()
        {
          Id = user.Id,
          UserName = user.UserName,
          NormalizedUserName = user.NormalizedUserName,
          Email = user.Email,
          NormalizedEmail = user.NormalizedEmail,
          EmailConfirmed = user.EmailConfirmed,
          PasswordHash = user.PasswordHash,
          SecurityStamp = user.SecurityStamp,
          ConcurrencyStamp = user.ConcurrencyStamp,
          PhoneNumber = user.PhoneNumber,
          PhoneNumberConfirmed = user.PhoneNumberConfirmed,
          TwoFactorEnabled = user.TwoFactorEnabled,
          LockoutEnd = user.LockoutEnd,
          LockoutEnabled = user.LockoutEnabled,
          AccessFailedCount = user.AccessFailedCount


          // Add the remainder properties
        }).FirstOrDefault();
          return View(user);
       }


    [HttpPost]
    [ValidateAntiForgeryToken]
    public ActionResult 

   Edit([Bind("Id,Username,NormalizedUserName,Email,NormalizedEmail,
   EmailConfirmed,PasswordHash,SecurityStamp,")] Listdata  listdata)
    {
        if (ModelState.IsValid)
        {
            db.Entry(listdata).State = EntityState.Modified;
            db.SaveChanges();
            return RedirectToAction("Index");
        }
        return View(listdata);
        }

我的期望是，当我单击“编辑视图”页面中的“编辑”链接时，它将转到我想要更新其信息的用户，并将该更改保存在帖子上。