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=1)]
public int StudentKey1 { get; set; }

[Key]
[Column(Order=2)]
public int StudentKey2 { get; set; }

[MaxLength(20)]
[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=1)]
public int StudentKey1 { get; set; }

[Key]
[Column(Order=2)]
public int StudentKey2 { get; set; }

[MaxLength(20)]
[ConcurrencyCheck]
[Required]
[Column("SName",Order=4,TypeName="varchar")]
public string StudentName { get; set; }

[NotMapped()]
public int? Age { get; set; }

[Column("StandardID",Order=3,TypeName="int")]
public int StdId { get; set; }

[ForeignKey("StdId")]
public virtual Standard Standard { get; set; }

}
}