Sql server 2008 如何在寄存器模型中添加dropdownlist

//此代码导致一个错误，即Companytype没有//IEnumerable类型的viewdata项

//RegisterModel中的当前代码

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

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

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


    [Required]
    [Display(Name = "Company Type")]
    public IEnumerable<SelectListItem> CompTypeList { get; set; }



    [Required]
    [Display(Name = "Total number of Branches")]
    [Range(1,10,ErrorMessage = "The {0} must be at least {1}")]
    public int TotalBranches { 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 password")]
    [System.ComponentModel.DataAnnotations.Compare("Password", ErrorMessage = "The password and confirmation password do not match.")]
    public string ConfirmPassword { get; set; }






}

---

非常感谢您的帮助

对于html.dropdownlist帮助程序，选择列表项是无效的参数。它正在寻找一份清单。仅在viewbag中存储数据，并在视图中创建选择列表，如下所示：

//控制器

public ActionResult Register()
{
ViewBag.CompTypeList = db.Companytype.OrderBy(y => y.Name).ToList();
return View();
}

//看法

@Html.DropDownList("CompanyType", new SelectList(ViewBag.CompTypeList, "Id", "Name"))

---

这将正确地呈现视图中的下拉列表，并消除错误。Id是列表的值字段，Name是要显示的字段。希望这有帮助

//DBName DefaultDB//DBTable CoAdd//DBvar CoID（标识）和Companytype插入CoAdd值（“电信”）插入CoAdd值（“汽车”）插入CoAdd值（“政府”）插入CoAdd值（“银行业”你不会在模型中添加dropdownlist。它们是在视图中创建的。我想你要问的是，什么样的实体会构建dropdownlist。这是你应该研究的。这个论坛不是为这类问题而设的。

public ActionResult Register()
{
ViewBag.CompTypeList = db.Companytype.OrderBy(y => y.Name).ToList();
return View();
}

@Html.DropDownList("CompanyType", new SelectList(ViewBag.CompTypeList, "Id", "Name"))