EF Update DB启用迁移导航属性错误

时间:2015-10-09 11:15:13

标签: c# asp.net-mvc entity-framework

我正在使用EF Migrations和MVC 5 - 但是我得到了我的想法/想法/是一个非常常见的错误,但我见过的常见解决方案,我已经得到了:

无法将属性“companyId”配置为导航属性。该属性必须是有效的实体类型,并且该属性应具有非抽象的getter和setter。对于集合属性,类型必须实现ICollection,其中T是有效的实体类型。

从环顾四周看,我的代码看起来是正确的,并在 enable-migrations update-database 之前工作,看看我的系统中的测试数据是否在我放入之前被擦除这种改变直播。在ASN模型中,我添加了一个testAsn的字符串属性,以查看它是否作为列添加到数据库中。

我不确定此错误是否与ASN或Contacts表/模型有关,但它们都具有相同的实现。

我是否误解了导航属性的使用?任何帮助将不胜感激。

模型

[Table("Company")]

    public class Company
    {
        [Key]
        public int companyId { get; set; }
        [Required(ErrorMessage="Company name required.")]
        [StringLength(100)]
        public string name { get; set; }
        [Required(ErrorMessage = "Telephone required.")]
        public string telephone { get; set; }
        [Required(ErrorMessage="Registration Number required.")]
        [StringLength(30)]
        public string regNumber { get; set; }
        // navigation properties  of the models that belong to the company
        public virtual IList<Asn> asns { get; set; }
        public virtual IList<Contact> contacts { get; set; }
    }
[Table("Asn")]
    public class Asn
    {
        [Key]
        public int asnId { get; set; }
        public int companyId { get; set; }
        [ForeignKey("companyId")]
        // property I'm adding to test whether migrations is working
        public string testAsn { get; set; }
        // *******************************
        // as pointed out in the correct answer, the property below
        // this comment should be above testAsn
        // *******************************
        public virtual Company company { get; set; }
        [Required] // always has value
        public bool userBehalf { get; set; }
        [Required] // always has value
        public bool confirmAssignment { get; set; }
        [Required(ErrorMessage="Prefix required.")]
        public string prefixAnnounced { get; set; }
        [Required(ErrorMessage="Pending Ticket ID required.")]
        public string pendingTicket { get; set; }
        [DataType(DataType.MultilineText)]
        public string comments { get; set; }
        public bool asNumType { get; set; }
        public string reason { get; set; }
    }
    [Table("Contact")]
    public class Contact
    {
        [Key]
        public int contactId { get; set; }
        public int companyId { get; set; }
        [ForeignKey("companyId")]
        public virtual Company company { get; set; }
        [StringLength(100, MinimumLength=3)]
        [Required(ErrorMessage="Contact name required.")]
        public string name { get; set; }
        [Required(ErrorMessage="Telephone required.")]
        [StringLength(30, MinimumLength=11)]
        public string telephone { get; set; }
        [Required]
        [RegularExpression(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
                            @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
                            @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$",
                            ErrorMessage = "Email is not valid.")]
        public string email { get; set; }
        [Required(ErrorMessage = "Contact type required.")]
        public string type { get; set; }
    }    

1 个答案:

答案 0 :(得分:1)

您错放了ForeignKey课程中的Asn属性。它不是放在company属性上,而是放在testAsn属性上。