gistfile1.txt

private void SetProfileKeys(ContentProfile profile, ProfileItem profileItem)
{
    foreach (ProfileKeyItem profileKeyItem in profileItem.Keys.ToList())
    {
        ProfileKeyItem keyItem = profileKeyItem;
        if (profile.Keys.FirstOrDefault(k => string.Compare(k.Key, keyItem.Name, StringComparison.InvariantCultureIgnoreCase) == 0) == null)
        {
            ContentProfileKeyData key = new ContentProfileKeyData(keyItem)
            {
                Value = keyItem.GetDefaultValue()
            };
            profile.AddKey(key);
        }
    }

    foreach (ContentProfileKeyData key in profile.Keys.Where(key => key.ProfileDefinitionId == Guid.Empty))
    {
        profile.RemoveKey(key);
    }
    
    TrackingField.UpdateKeyValues(profile);
}