internal static bool Equals <T>(IIdentifiable <T> left, IIdentifiable <T> right)
{
if (ReferenceEquals(left, right))
{
return(true);
}
if (ReferenceEquals(left, null) || ReferenceEquals(right, null))
{
return(false);
}
if (typeof(T) != left.GetType() || typeof(T) != right.GetType())
{
return(false);
}
return(left.Id == right.Id
? left.DataEquals((T)right)
: left.Id.Equals(-1) && right.Id.Equals(-1) ? left.DataEquals((T)right) : false);
}