实体框架中多列的唯一键约束

本文介绍了实体框架中多列的唯一键约束的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我使用的是实体框架 5.0 代码优先；

I'm using Entity Framework 5.0 Code First;

public class Entity { [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)] public string EntityId { get; set;} public int FirstColumn { get; set;} public int SecondColumn { get; set;} }

我想让 FirstColumn 和 SecondColumn 之间的组合是唯一的.

I want to make the combination between FirstColumn and SecondColumn as unique.

示例:

Id FirstColumn SecondColumn 1 1 1 = OK 2 2 1 = OK 3 3 3 = OK 5 3 1 = THIS OK 4 3 3 = GRRRRR! HERE ERROR

有没有办法做到这一点?

Is there anyway to do that?

推荐答案

使用 Entity Framework 6.1，您现在可以执行以下操作:

With Entity Framework 6.1, you can now do this:

[Index("IX_FirstAndSecond", 1, IsUnique = true)] public int FirstColumn { get; set; } [Index("IX_FirstAndSecond", 2, IsUnique = true)] public int SecondColumn { get; set; }

属性中的第二个参数用于指定索引中列的顺序.更多信息:MSDN

The second parameter in the attribute is where you can specify the order of the columns in the index. More information: MSDN