为什么 ASP.NET Identity 接口使用字符串作为主键和外键

我正在查看新的ASP.NET标识类上的接口，以及它首先使用实体框架代码创建的数据库.我正在使用Visual Studio 2013 RC.

乍一看，数据库模式看起来相当正常:

But all the keys are NVARCHAR(128)

出于某种疯狂的原因，AspNetUserSecrets.Id是一个PK，看起来它可以指向AspNetUsers表中的多条记录.这是否意味着多个AspNetUsers必须共享同一密码？

当我看到你被迫实现的接口时，这些都是字符串...

public class User : IUser
{
    public string Id { get; set; }
    public string UserName { get; set; }
}

public class UserSecret : IUserSecret
{
    public string UserName { get; set; }
    public string Secret { get; set; }
}

public class UserRole : IUserRole
{
    public string UserId { get; set; }
    public string RoleId { get; set; }
}

public class UserClaim : IUserClaim
{
    public string UserId { get; set; }
    public string ClaimType { get; set; }
    public string ClaimValue { get; set; }
}

public class UserManagement : IUserManagement
{
    public string UserId { get; set; }
    public bool DisableSignIn { get; set; }
    public DateTime LastSignInTimeUtc { get; set; }
}

public class Tokens : IToken
{
    public string Id { get; set; }
    public string Value { get; set; }
    public DateTime ValidUntilUtc { get; set; }
}

public class UserLogin : IUserLogin
{
    public string UserId { get; set; }
    public string LoginProvider { get; set; }
    public string ProviderKey { get; set; }
}

public class Role : IRole
{
    public string Id { get; set; }
    public string Name { get; set; }
}

所以我接受了这样一个事实，即我可能必须使用PK和FK关系的字符串来实现这一点.

But I'd really love to know WHY it's built like this...?个

EDIT: Time has passed and there are now articles on how to extend the asp.net identity to use int (or guid) fields:个

http://www.asp.net/identity/overview/extensibility/change-primary-key-for-users-in-aspnet-identity个