在验证时排除某些实体的属性

Question

我有这个实体

public class Account : ValidationModel, IFormattable
{
    private int id;
    private string cardNumber;
    private string username;
    private string password;
    private string fullName;
    ......

    public Account()
    {
        this.id = 0;
        this.username = String.Empty;
        this.password = String.Empty;
        this.fullName = String.Empty;
        ................
    }
    public int Id
    {
        get { return id; }
        set { SetProperty(ref id, value); }
    }
    [Required(ErrorMessageResourceName = "EnterUsername", ErrorMessageResourceType = typeof(Resources))]
            public string Username
    {
        get { return username; }
        set { SetProperty(ref username, value); }
    }
    [Required(ErrorMessageResourceName = "EnterCardNumber", ErrorMessageResourceType = typeof(Resources))]
    public string CardNumber
    {
        get { return cardNumber; }
        set { SetProperty(ref cardNumber, value); }
    }
    [Required(ErrorMessageResourceName = "EnterPassword", ErrorMessageResourceType = typeof(Resources))]        
    public string Password
    {
        get { return password; }
        set { SetProperty(ref password, value); }
    }
    [Required(ErrorMessageResourceName = "EnterFullName", ErrorMessageResourceType = typeof(Resources))]
  .......
}

当我想验证这个实体时，我会像这样调用accountInstance.Validate（）

string errorMessage = account.Validate();
                if (!string.IsNullOrEmpty(errorMessage))
                {
                    messageService.ShowError(errorMessage);
                    return;
                }

它将验证所有属性。现在，我想要排除ID，密码，用户名 如何在不改变实体框架的DataContext的情况下在C＃中执行此操作？