Question

我有以下实体：

Not Authorized

我有这个控制器动作：

public partial class Enrollments
{
  [Key]
  public int ID { get; set; }
  public int RegistrationID { get; set; }
  public int ModuleID { get; set; }

  [DisplayFormat(DataFormatString = "{0:dd/MM/yyyy}", ApplyFormatInEditMode = true)]
  [Display(Name = "Enrollment Date")]
  public Nullable<System.DateTime> EnrollmentDate { get; set; }

  [Display(Name = "Price Agreed")]
  public Nullable<decimal> PriceAgreed { get; set; }
  public Nullable<decimal> Grade { get; set; }

  [NotMapped]
  public virtual Modules Modules { get; set; }
  [NotMapped]
  public virtual Registrations Registrations { get; set; }

  [NotMapped]
  [Display(Name = "Student")]
  public virtual String StudentName { get; set; }
  [NotMapped]
  public virtual int StudentID { get; set; }
  [NotMapped]
  [Display(Name = "Course")]
  public virtual String CourseName { get; set; }
  [NotMapped]
  public virtual int CourseID { get; set; }
  [NotMapped]
  [Display(Name = "Module")]
  public virtual String ModuleName { get; set; }
}

我认为：

public ActionResult Create()
{
  ViewBag.StudentNames = new SelectList(db.Students.Select(x =>
                             new SelectListItem
                             {
                               Value = x.ID.ToString(),
                               Text = x.LastName.Trim() + ", " + x.FirstName
                                                      }), 
                              "StudentID", 
                              "StudentName");
  return View();
}

我收到此错误：DataBinding：'System.Web.Mvc.SelectListItem'不包含名称为'StudentID'的属性。

我检查了许多其他类似的问题，实际上，此代码基于其中一个答案，但仍然出现错误。

Answer 1

您收到此错误，因为SelectListItem确实没有属性StudentyID。将初始化更改为

ViewBag.StudentNames = new SelectList(db.Students.Select(x =>
                    new SelectListItem
                    { 
                        Value = x.ID.ToString(),
                        Text = x.StudentName
                    }),
                "Value",
                "Text");

或类似的东西

ViewBag.StudentNames = new SelectList(db.Students.Select(x =>
                    new
                    { 
                        StudentID = x.ID.ToString(),
                        StudentName = x.StudentName
                    }),
                "StudentID",
                "StudentName");

数据绑定：“ System.Web.Mvc.SelectListItem”不包含名称为“ StudentID”的属性

1 个答案: