async Task Search(string text)
{
SearchTerm = text;
Skip = 0;
try
{
SearchCollection.Clear();
// update current search options
SearchStartDate = StartDate;
SearchEndDate = EndDate;
SearchCategory = SelectedCategory;
// execute searchTask with the specified search keywords for the first time
Debug.WriteLine(SearchTerm);
IQueryResultEnumerable <News> items = await NewsManager.DefaultManager.GetNewsAsync((news) => news.Title.ToLower().Contains(SearchTerm.ToLower()) && news.NewsDate >= SearchStartDate && news.NewsDate <= SearchEndDate && (news.Type == SearchCategory || SearchCategory == "Tất cả"), Skip, 5);
if (items != null && items.TotalCount > 0)
{
HeaderString = "- " + items.TotalCount + " kết quả -";
foreach (var item in items)
{
SearchCollection.Add(item);
}
Skip += 5;
}
else
{
HeaderString = "- Không có kết quả -";
}
} catch (Exception e)
{
Debug.WriteLine(e);
}
}
/// <summary>
/// Get News with a LINQ expression.
/// </summary>
/// <param name="action"></param>
/// <returns></returns>
public async Task <IQueryResultEnumerable <News> > GetNewsAsync(System.Linq.Expressions.Expression <System.Func <BKNews.News, bool> > action, int skip, int take)
{
try
{
#if OFFLINE_SYNC_ENABLED
if (syncItems)
{
await this.SyncAsync();
}
#endif
IMobileServiceTableQuery <News> query = NewsTable.Where(action).OrderByDescending(news => news.NewsDate).Skip(skip).Take(take);
query = query.IncludeTotalCount();
IQueryResultEnumerable <News> items = (IQueryResultEnumerable <News>) await query.ToListAsync();
return(items);
}
catch (MobileServiceInvalidOperationException msioe)
{
Debug.WriteLine(@"Invalid sync operation: {0}", msioe.Message);
}
catch (Exception e)
{
Debug.WriteLine(@"Sync error: {0}", e.Message);
}
return(null);
}
public async void LoadMore()
{
Skip += 5;
IQueryResultEnumerable <News> items = await NewsManager.DefaultManager.GetNewsAsync((news) => news.Title.ToLower().Contains(SearchTerm.ToLower()) && news.NewsDate >= SearchStartDate && news.NewsDate <= SearchEndDate && (news.Type == SearchCategory || SearchCategory == "Tất cả"), Skip, 5);
if (items != null)
{
foreach (var item in items)
{
if (User.CurrentUser.Bookmarks.Contains(item))
{
item.IsBookmarkedByUser = true;
}
SearchCollection.Add(item);
}
}
}
