我看过这篇文章并尝试这样做

Autogenerate primary key (Guid) Entity Framework CTP5

 [Key,DatabaseGenerated(DatabaseGeneratedOption.Identity)]
 public Guid CompanyID { set; get; }

但是我仍然得到错误

Identity column 'CompanyID' must be of data type int,bigint,smallint,tinyint,or decimal or numeric with a scale of 0,and constrained to be nonnullable.

这是我在包管理器控制台上运行Update-Database命令的时候.