public CategoryWithGroupList Categories([FromUri] CategoryParam param)
{
if (param == null)
{
throw new ArgumentNullException("param");
}
if (!(param.StartPoint.HasValue || (param.StartPointAlias == null)))
{
param.sp = new int?(CatalogProvider.GetGeoPointIdByAlias(param.StartPointAlias));
}
return(new CategoryWithGroupList(ExcursionProvider.GetCategories(param.Language, param.StartPoint)));
}
