Validate object based on external factors (ie. data store uniqueness)

Question

Description

My solution has these projects:

• DAL = Modified Entity Framework
• DTO = Data Transfer objects th

Answer 1

The S#arp Architecture has an [DomainSignature] method identifier that used with the class level validator [HasUniqueDomainSignature] will do the work. See the sample code below:

[HasUniqueDomainSignature]
public class User : Entity
{
    public User()
    {
    }

    public User(string login, string email) : this()
    {
        Login = login;
        Email = email;
    }

    [DomainSignature]
    [NotNullNotEmpty]
    public virtual string Login { get; set; }

    [DomainSignature]
    public virtual string Email { get; set; }

}

Take a closer look at http://www.sharparchitecture.net/