public static KeyedList GetOrAddGroup(this GroupedList list, string key)
{
// get group (keyed list) in grouped list with specified key
// if no group is found, new group is created and returned
if (list.Any(g => g.Key == key))
{
return(list.First(g => g.Key == key));
}
else
{
var newGroup = new KeyedList(key);
list.Add(newGroup);
return(newGroup);
}
}
public static GroupedList GetGroupedList(this IEnumerable <IHasCategory> list)
{
var query = from item in list
group item by item.Category into g
orderby g.Key
select new { GroupName = g.Key, Items = g };
var groups = new ObservableCollection <KeyedList>();
foreach (var g in query)
{
KeyedList info = new KeyedList(g.GroupName);
foreach (var item in g.Items)
{
info.Add(item);
}
groups.Add(info);
}
return(groups);
}