/// <summary>
/// Create a list of AlphaGroup<T> with keys set by a SortedLocaleGrouping.
/// </summary>
/// <param name="items">The items to place in the groups.</param>
/// <param name="ci">The CultureInfo to group and sort by.</param>
/// <param name="getKey">A delegate to get the key from an item.</param>
/// <param name="sort">Will sort the data if true.</param>
/// <returns>An items source for a LongListSelector</returns>
public static List <AlphaKeyGroup <T> > CreateGroups(IEnumerable <T> items, CultureInfo ci, GetKeyDelegate getKey, bool sort)
{
var slg = new SortedLocaleGrouping(ci);
var list = CreateGroups(slg);
foreach (var item in items)
{
var index = slg.GetGroupIndex(getKey(item));
if (index >= 0 && index < list.Count)
{
list[index].Add(item);
}
}
if (!sort)
{
return(list);
}
foreach (var group in list)
{
@group.Sort((c0, c1) => ci.CompareInfo.Compare(getKey(c0), getKey(c1)));
}
return(list);
}
/// <summary>
/// Create a list of AlphaGroup<T> with keys set by a SortedLocaleGrouping.
/// </summary>
/// <param name="slg">The </param>
/// <returns>Theitems source for a LongListSelector</returns>
private static List <AlphaKeyGroup <T> > CreateGroups(SortedLocaleGrouping slg)
{
return(slg.GroupDisplayNames.Select(key => new AlphaKeyGroup <T>(key)).ToList());
}