Entity Framework中多个列的唯一键限制

本文介绍了Entity Framework中多个列的唯一键限制的处理方法，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

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

我想使 FirstColumn 和 SecondColumn 作为唯一的。

示例：

Id FirstColumn SecondColumn 1 1 1 = OK 2 2 1 = OK 3 3 3 = OK 5 3 1 =这个OK 4 3 3 = GRRRRR！这里错误

有没有办法？

解决方案

使用实体框架6.1，您现在可以执行此操作：

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

属性中的第二个参数是可以在索引中指定列的顺序。 更多信息： MSDN

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;} }

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

Example:

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

Is there anyway to do that?

解决方案

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; }

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