7.8 数据注解特性--Column

Column特性可以用到类的属性中，Code-First默认的约定是使用属性名称作为列名.这个Column特性可以打破这个特性。

看下面的代码：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace EF2
{
    [Table("StudentMaster",Schema="WaHaHa")]
   public class Student
    {
        [Key]
        [Column(Order=)]
        public int StudentKey1 { get; set; }
 
        [Key]
        [Column(Order=)]
        public int StudentKey2 { get; set; }
 
        [MaxLength()]
        [ConcurrencyCheck]
        [Required]
        public string StudentName { get; set; }
 
        [NotMapped()]
        public int? Age { get; set; }
 
        [Column("StandardID")]
        public int StdId { get; set; }
 
        [ForeignKey("StdId")]
        public virtual Standard Standard { get; set; }
 
    }
}

当然你还可以指定列的顺序【Order】和类型【Type】，请看：

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
namespace EF2
{
    [Table("StudentMaster",Schema="WaHaHa")]
   public class Student
    {
        [Key]
        [Column(Order=)]
        public int StudentKey1 { get; set; }
 
        [Key]
        [Column(Order=)]
        public int StudentKey2 { get; set; }
 
        [MaxLength()]
        [ConcurrencyCheck]
        [Required]
        [Column(,TypeName="varchar")]
        public string StudentName { get; set; }
 
        [NotMapped()]
        public int? Age { get; set; }
 
        [Column(,TypeName="int")]
        public int StdId { get; set; }
 
        [ForeignKey("StdId")]
        public virtual Standard Standard { get; set; }
 
    }
}