System.String'不包含名稱爲'Key'的屬性

Question

我試圖重新創建答案中的解釋this SO回答 但我得到這個錯誤並沒有任何意義，因爲我做了到底什麼答案說...

我應該說，我相對較新，所以任何幫助，非常感謝。謝謝 ！

塊拋出的錯誤查看

<div class="form-group"> 
    @Html.LabelFor(m => m.CustomerNumber, new { @class = "col-md-2 control-label" }) 
    <div class="col-md-10"> 
     @Html.DropDownListFor(m => m.CustomerNumber, Model.AvailableCustNum) 
    </div> 
</div> 

視圖模型

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

    [Required] 
    [Display(Name = "User Name")] 
    [StringLength(50, ErrorMessage = "The {0} must be at least {2} characters long.", MinimumLength = 5)] 
    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 password")] 
    [System.ComponentModel.DataAnnotations.Compare("Password", ErrorMessage = "The password and confirmation password do not match.")] 
    public string ConfirmPassword { get; set; } 

    [DataType(DataType.PhoneNumber)] 
    [Display(Name = "Phone Number")] 
    public string PhoneNumber { get; set; } 

    [Required] 
    [Display(Name = "Customer Number")] 
    public string CustomerNumber { get; set; } 

    [Required] 
    [Display(Name = "DeptID")] 
    public int DeptID { get; set; } 

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

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

    [Required] 
    [Display(Name = "Address Line 1")] 
    public string AddressLine1 { get; set; } 

    [Display(Name = "Address Line 2")] 
    public string AddressLine2 { get; set; } 

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

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

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

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

    [Required] 
    [Display(Name = "UACC")] 
    public int UACC { get; set; } 

    [Required] 
    [Display(Name = "IsRecordCenter")] 
    public bool IsRecCenter { get; set; } 

    [Required] 
    [Display(Name = "IsCustAdmin")] 
    public bool IsCustAdmin { get; set; } 


    public SelectList AvailableGroups { get; set; } 

    public SelectList AvailableCustNum { get; set; } 

    public SelectList AvailableDept { get; set; } 


} 

控制器

public ActionResult Register() 
    { 
     RecordCenterLoginRepo RCLR = new RecordCenterLoginRepo(); 
     IdentityCheck IDC = new IdentityCheck(); 

     var recCenID = RCLR.GetRecordCenterID((string)Session["RecordCenter"]); 


     Dictionary<string,int> custNums = IDC.GetAvailableCustomerNumbers(recCenID); 
     Dictionary<string,int> depts = IDC.GetAvailableDepartments((string)Session["CustomerNumber"], recCenID); 
     Dictionary<string,int> groups = IDC.GetAvailableGroups((string)Session["CustomerNumber"], recCenID); 

     RegisterViewModel model = new RegisterViewModel() { 

      AvailableCustNum = new SelectList(custNums, "Key", "Value"), 
      AvailableDept = new SelectList(depts, "Key", "Value"), 
      AvailableGroups = new SelectList(groups, "Key", "Value") 
     }; 

     return View(model); 
    } 

Answer 1

第二屆和SelectList()第三參數值和文本字符串名稱字段。 IDC.GetAvailableCustomerNumbers(recCenID)是否返回Dictionary<string, string>？您引用的示例在其代碼中使用了字典，這就是「Key，Values」字符串工作的原因。如果您使用的是IEnumerable<T>，請嘗試使用模型上的屬性名稱而不是「Key」和「Value」。