New Post: Discover One to One Relationship

Is there a way to discover whether a table has a one-to-one relationship to another table. For example:

class User{

public string UserDetailId {get; set; }
public virtual UserDetail UserDetail {get; set; }

}

class UserDetail {

public string UserDetailId {get; set; }
public virtual User User {get; set; }

}

UserDetailId would give a ForeignKey however, UserDetail would not relate directly back to User