public Task <IEnumerable <SearchHistoryListItem> > GetPagedItems(int head, int count)
{
var items = SearchHistoryDb.GetHistoryItems().Skip(head).Take(count)
.Select(x => new SearchHistoryListItem(x, _SearchPageViewModel.OnSearchHistorySelected))
.ToArray();
return(Task.FromResult(items.AsEnumerable()));
}
private static IAsyncOperation <IReadOnlyList <object> > loadSuggestion(AutoSuggestBox sender)
{
var input = sender.Text;
var sep = GetSeparator(sender);
var useHistory = GetUseHistory(sender);
return(Task.Run <IReadOnlyList <object> >(() =>
{
input = input?.Trim() ?? "";
using (var db = new SearchHistoryDb())
{
var history = useHistory ? ((IEnumerable <SearchHistory>)db.SearchHistorySet
.Where(sh => sh.Content.Contains(input))
.OrderByDescending(sh => sh.Time))
.Distinct()
.Select(sh => sh.SetHighlight(input)) : Enumerable.Empty <SearchHistory>();
splitKeyword(sep, input, out var lastwordNs, out var lastword, out var previous);
var dictionary = default(IEnumerable <ITagRecord>);
if (!string.IsNullOrEmpty(lastword) && lastwordNs != Namespace.Unknown)
{
var suffix = sep.EndsWith(" ") ? sep : sep + " ";
dictionary = TagRecordFactory.GetTranslatedRecords(lastword, lastwordNs)
.Concat <ITagRecord>(TagRecordFactory.GetRecords(lastword, lastwordNs))
.Where(t => t != null)
.OrderByDescending(t => t.Score)
.Take(25)
.Distinct(tagComparer)
.Select(tag => tag.SetPrefix(previous).SetSuffix(suffix));
}
else
{
dictionary = Enumerable.Empty <ITagRecord>();
}
try
{
return ((IEnumerable <object>)dictionary).Concat(history).ToList();
}
catch (InvalidOperationException)
{
//Collection changed
return null;
}
}
}).AsAsyncOperation());
}
public Task <int> ResetSource()
{
return(Task.FromResult(SearchHistoryDb.GetHistoryCount()));
}