public IGrouping <TToKey, TToElement> Map(IGrouping <TFromKey, TFromElement> from, IObjectMapperResolver resolver)
{
if (from == null)
{
return(null);
}
var keyMapper = resolver.GetMapperWithVerify <TFromKey, TToKey>();
var elementMapper = resolver.GetMapperWithVerify <TFromElement, TToElement>();
var key = keyMapper.Map(from.Key, resolver);
var values = new ArrayBuffer <TToElement>(from.FastCount() ?? 4);
foreach (var item in from)
{
values.Add(elementMapper.Map(item, resolver));
}
return(new Grouping <TToKey, TToElement>(key, values.ToArray()));
}