asp.net mvc viewmodel entity has no key 尝试从控制器创建视图时出错

Question

我在 ASP.NET-MVC 应用程序中有 ViewModel class，当我尝试创建视图时 --> 详细记录。我收到实体没有主键的错误。我已经测试了个人模型 classes 并且它们工作正常，我不是我在这里缺少的...

视图模型class

public class RentingApplicationsViewModel
{
    public RentingApplicationsViewModel() {

        _PropertyRentingApplicationModel = new PropertyRentingApplication();
        _PropertyTypeModel = new PropertyType();
    }

    public PropertyRentingApplication _PropertyRentingApplicationModel { get; set; }
    public PropertyType _PropertyTypeModel { get; set; }


}

型号class

[Table("PropertyRentingApplication")]
public class PropertyRentingApplication
{
     public PropertyRentingApplication() { }


     [Key]
    // [Column(Order = 0)]
     [Display(Name = "Application ID")]
     public int ApplicationID { get; set; }

     //[Key]
     //[Column(Order = 1)]
     [Display(Name = "Property Type ID")]
     [Required(ErrorMessage = "Require Property Type ID")]
     public int PropertyTypeID { get; set; }

     //[Key]
     //[Column(Order = 2)]
     [Display(Name = "Student ID")]
     [Required(ErrorMessage = "Require Student ID")]
     public int StudentID { get; set; }

     [Display(Name = "Application Reference")]
     [MaxLength(150)]
     public string ApplicationReference { get; set; }

     [Display(Name = "Date Of Application")]
     [Required(ErrorMessage = "Require Date of Application Been Submitted")]
     public System.DateTime DateOfApplication { get; set; }

     [Display(Name = "Secure Entire Property")]
     [Required(ErrorMessage = "Require Information on If You Want to Secure Entire Property")]
     public bool SecureEntireProperty { get; set; }

     [Display(Name = "Application Status")]
     [MaxLength(50)]
     [Required(ErrorMessage = "Require Application Status")]
     public string ApplicationStatus { get; set; }

     public PropertyType PropertyType { get; set; }
     public Student Student { get; set; }

     public ICollection<AdditionalTenant> AdditionalTenants { get; set; }

}

.....

[Table("PropertyType")]
public class PropertyType
{
     public PropertyType() { }

     [Key]
     [Display(Name = "Property Type ID")]
     public int PropertyTypeID { get; set; }

     [Display(Name = "Property Type")]
     [MaxLength(250)]
     [Required(ErrorMessage = "Require Property Type i.e. Flat, House, Studio")]
     public string Type { get; set; }

     [Display(Name = "Title")]
     [MaxLength(250)]
     [Required(ErrorMessage = "Require Property Type Title")]
     public string Title { get; set; }

     public ICollection<Property> Properties { get; set; }
     public ICollection<PropertyRentingPrice> PropertyRentingPrices { get; set; }

}

Answer 1

您是否连接到包含身份 classes 的默认上下文，如果是这样，脚手架正在查看身份上下文中的每个 class，您应该尝试为您的class 或者您可以将 [key] 放在用户 guid 上方。

asp.net mvc viewmodel entity has no key 尝试从控制器创建视图时出错

asp.net mvc viewmodel entity has no key Error when trying to create view from controller

asp.net-mvc-viewmodel

entity-framework-6

asp.net-mvc-5

视图模型class

型号class