public IEnumerable <CategoryDto> GetCategories(
int siteId, int lft, int rgt,
CategoryContainerOption categoryContainerOption)
{
ISite site = this._resp.GetSiteById(siteId);
IEnumerable <ICategory> categories =
site.GetCategories(lft, rgt, categoryContainerOption);
CategoryDto dto;
foreach (ICategory category in categories)
{
yield return(CategoryDto.ConvertFrom(category));
}
}