实体框架代码中的外键名称错误优先

Question

当我使用以下代码时,使用主键和外键关系成功生成表.

 [Table("tblDepartments")]
    public class DepartmentModel
    {
        [Key]
        public int DepartmentID { get; set; }
        public string Name { get; set; }
        public string Location { get; set; }
        public ICollection<EmployeeModel> Employees { get; set; }
    }



    [Table("tblEmployees")]
    public class EmployeeModel
    {
        [Key]
        public int EmployeeID { get; set; }
        public string Name { get; set; }
        public string Gender { get; set; }
        public string City { get; set; }      
        public virtual DepartmentModel DID { get; set; }

    }

但是,当我使用以下代码时,我得到错误:

[Table("tblDepartments")]
    public class DepartmentModel
    {
        [Key]
        public int DepartmentID { get; set; }
        public string Name { get; set; }
        public string Location { get; set; }
        public ICollection<EmployeeModel> Employees { get; set; }
    }



    [Table("tblEmployees")]
    public class EmployeeModel
    {
        [Key]
        public int EmployeeID { get; set; }
        public string Name { get; set; }
        public string Gender { get; set; }
        public string City { get; set; }     

        [ForeignKey("DeptID")]
        public virtual DepartmentModel DID { get; set; }

    }

错误:

类型为"MvcApplication1.Models.EmployeeModel"的属性"DID"上的ForeignKeyAttribute无效.在依赖类型"MvcApplication1.Models.EmployeeModel"上找不到外键名称"DeptID".Name值应该是以逗号分隔的外键属性名称列表.

请帮忙.提前致谢.

Answer 1

问题出在您的EmployeeModel上,因为您缺少Gert建议的表格中的离开字段.您可以将以下内容用于EmployeeModel

[Table("tblEmployees")]
public class EmployeeModel
{
    [Key]
    public int EmployeeID { get; set; }
    public string Name { get; set; }
    public string Gender { get; set; }
    public string City { get; set; }     
    public int DeptID { get; set; } //<-- You forgot to add this
    [ForeignKey("DeptID")]
    public virtual DepartmentModel DID { get; set; }

}