的EntityType'ApplicantPosition“没有定义键 [英] EntityType 'ApplicantPosition' has no key defined

问题描述

在运行我的第一个asp.net MVC应用程序，我得到这个错误
我认为，实体框架自动将创造列名与ID的结束键？不是它是否正确？

正如你可以看到ApplicantPositionID将与2列作为主键的表，因为这将涉及到申请人和也的位置。

模型生成过程中检测到一个或多个验证错误：

  System.Data.Edm.EdmEntityType：的EntityType'ApplicantImage没有定义键。定义此的EntityType的关键。
System.Data.Edm.EdmEntityType：的EntityType'ApplicationPositionHistory没有定义键。定义此的EntityType的关键。
System.Data.Edm.EdmEntitySet：的EntityType：EntitySet的ApplicantsPositions是基于一个没有定义的键型ApplicantPosition。
System.Data.Edm.EdmEntitySet：的EntityType：EntitySet的ApplicantImages是基于一个没有定义的键型ApplicantImage。
System.Data.Edm.EdmEntitySet：的EntityType：EntitySet的ApplicationsPositionHistory是基于一个没有定义的键型ApplicationPositionHistory。
 

该错误是在此行中抛出的：

 公众的ActionResult指数（）
        {
            返回查看（db.Positions.ToList（））;
        }
 

和我的模型是以下之一：

 命名空间HRRazorForms.Models
{    公共类职位
    {
        公众诠释PositionID {搞定;组; }
        [StringLength（20，MinimumLength = 3）]
        公共字符串名称{;组; }
        公众诠释yearsExperienceRequired {搞定;组; }
        公共虚拟的ICollection＆LT; ApplicantPosition＆GT; applicantPosition {搞定;组; }
    }    公共类申请人
    {
        公众诠释ApplicantId {搞定;组; }
        [StringLength（20，MinimumLength = 3）]
        公共字符串名称{;组; }
        公共字符串电话{搞定;组; }
        公共字符串skypeuser {搞定;组; }
        公共ApplicantImage照片{搞定;组; }
        公共虚拟的ICollection＆LT; ApplicantPosition＆GT; applicantPosition {搞定;组; }    }    公共类ApplicantPosition
    {
        公众诠释ApplicantID {搞定;组; }
        公众诠释PositionID {搞定;组; }
        公共虚拟范围位置{搞定;组; }
        公共虚拟申请人申请{搞定;组; }
        公众的DateTime appliedDate {搞定;组; }
        公众诠释StatusValue {搞定;组; }        公开状态状态
        {
            {返回（状态）StatusValue; }
            集合{StatusValue =（int）的值; }
        }        // [NotMapped]
        //公众诠释numberOfApplicantsApplied
        // {
        //获取
        // {
        // INT查询=
        //（美联社位置
        //其中ap.Status ==（INT）Status.Applied
        //选择AP
        //）.Count之间的（）;
        //返回查询;
        //}
        //}
    }
    公共类ApplicantImage
    {
        公众诠释ApplicantId {搞定;私人集; }
        公众的byte []图片{搞定;组; }
    }    公共类地址
    {
        [StringLength（20，MinimumLength = 3）]
        公共字符串国家{搞定;组; }
        [StringLength（20，MinimumLength = 3）]
        公共字符串城{搞定;组; }
        [StringLength（20，MinimumLength = 3）]
        公共字符串AddressLine1 {搞定;组; }
        公共字符串AddressLine2 {搞定;组; }
    }    公共类ApplicationPositionHistory
    {
        公共ApplicantPosition applicantPosition {搞定;组; }
        公共状态OLDSTATUS {搞定;组; }
        公共状态NEWSTATUS {搞定;组; }
        [StringLength（500，MinimumLength = 10）]
        公共字符串意见{搞定;组; }
        公众的DateTime dateModified {搞定;组; }
    }    公共枚举状态
    {
        应用，
        AcceptedByHR，
        AcceptedByTechnicalDepartment，
        InterviewedByHR，
        InterviewedByTechnicalDepartment，
        InterviewedByGeneralManager，
        AcceptedByGeneralManager，
        不接受
    }}
 

解决方案

EF code首先只能推断，一个属性是一个主键如果该属性被称为编号或＆LT;类名称＆gt;标识（或者如果它被注释与关键属性）。
所以，你需要延长你如ApplicantImage与ApplicantImageId或id属性等。

编辑：关于coneventions一个条每页：<一href=\"http://blogs.msdn.com/b/efdesign/archive/2010/06/01/conventions-for-$c$c-first.aspx\">Conventions为code首先

When running my first asp.net mvc application I got this error I thought that entity framework automatically would create the keys of column names that end with Id? isnt it correct?

As you can see the ApplicantPositionID would be a table with 2 columns as primary key because it would relate to Applicants and also to Position.

One or more validation errors were detected during model generation:

System.Data.Edm.EdmEntityType: : EntityType 'ApplicantImage' has no key defined. Define the key for this EntityType.
System.Data.Edm.EdmEntityType: : EntityType 'ApplicationPositionHistory' has no key defined. Define the key for this EntityType.
System.Data.Edm.EdmEntitySet: EntityType: EntitySet �ApplicantsPositions� is based on type �ApplicantPosition� that has no keys defined.
System.Data.Edm.EdmEntitySet: EntityType: EntitySet �ApplicantImages� is based on type �ApplicantImage� that has no keys defined.
System.Data.Edm.EdmEntitySet: EntityType: EntitySet �ApplicationsPositionHistory� is based on type �ApplicationPositionHistory� that has no keys defined.

The error is thrown in this line:

public ActionResult Index()
        {
            return View(db.Positions.ToList());
        }

And my model is the following one:

namespace HRRazorForms.Models
{



    public class Position
    {
        public int PositionID { get; set; }
        [StringLength(20, MinimumLength=3)]
        public string name { get; set; }
        public int yearsExperienceRequired { get; set; }
        public virtual ICollection<ApplicantPosition> applicantPosition { get; set; }
    }

    public class Applicant
    {
        public int ApplicantId { get; set; }
        [StringLength(20, MinimumLength = 3)]
        public string name { get; set; }
        public string telephone { get; set; }
        public string skypeuser { get; set; }
        public ApplicantImage photo { get; set; }
        public virtual ICollection<ApplicantPosition> applicantPosition { get; set; }

    }

    public class ApplicantPosition
    {
        public int ApplicantID { get; set; }
        public int PositionID { get; set; }
        public virtual Position Position { get; set; }
        public virtual Applicant Applicant { get; set; }
        public DateTime appliedDate { get; set; }
        public int StatusValue { get; set; }

        public Status Status
        {
            get { return (Status)StatusValue; }
            set { StatusValue = (int)value; }
        }

        //[NotMapped]
        //public int numberOfApplicantsApplied
        //{
        //    get
        //    {
        //        int query =
        //             (from ap in Position
        //              where ap.Status == (int)Status.Applied
        //              select ap
        //                  ).Count();
        //        return query;
        //    }
        //}
    }




    public class ApplicantImage
    {
        public int ApplicantId { get; private set; }
        public byte[] Image { get; set; }
    }

    public class Address
    {
        [StringLength(20, MinimumLength = 3)]
        public string Country { get; set; }
        [StringLength(20, MinimumLength = 3)]
        public string City { get; set; }
        [StringLength(20, MinimumLength = 3)]
        public string AddressLine1 { get; set; }
        public string AddressLine2 { get; set; }    
    }



    public class ApplicationPositionHistory
    {
        public ApplicantPosition applicantPosition { get; set; }
        public Status oldStatus { get; set; }
        public Status newStatus { get; set; }
        [StringLength(500, MinimumLength = 10)]
        public string comments { get; set; }
        public DateTime dateModified { get; set; }
    }

    public enum Status
    {
        Applied,
        AcceptedByHR,
        AcceptedByTechnicalDepartment,
        InterviewedByHR,
        InterviewedByTechnicalDepartment,
        InterviewedByGeneralManager,
        AcceptedByGeneralManager,
        NotAccepted
    }



}

解决方案

EF Code First can only infer that a property is a primary key if the property is called Id or <class name>Id (or if it is annotated with the Key attribute). So you need to extend your e.g. ApplicantImage with an ApplicantImageId or Id property etc.

Edit: An artice about the coneventions: Conventions for Code First

这篇关于的EntityType'ApplicantPosition“没有定义键的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！