我想实现动态负载不定式滚动列表。 （像http://blogs.windows.com/windows_phone/b/wpdev/archive/2012/10/01/how-to-create-an-infinite-scrollable-list-with-longlistselector.aspx ）
数据源是绑定到的ObservableCollection
列表中的填充与添加项目到集合开始
该ItemRealizedEvent开始的ObservableCollection的进一步馅料
我以为ItemrealizedEvent通过滚动触发，但它添加项目到集合的每个项目后始终触发。
- >因此，它不是动态的，它只是加载的一切
有任何想法吗？
在PageClass：
within the Constructor:
(...)
LLS_BooksListAll.DataContext = _viewModel.SearchAllViewModel;
LLS_BooksListAll.ItemsSource = _viewModel.SearchAllViewModel.MediumCollection;
(...)
private async void LLS_BooksListAll_ItemRealized(object sender, ItemRealizationEventArgs e)
{
if ((LLS_BooksListAll.ItemsSource as ObservableCollection<Medium>) == null) return;
//get number of loaded items
int currentItemsCount = (LLS_BooksListAll.ItemsSource as ObservableCollection<Medium>).Count;
if (!_viewModel.SearchAllViewModel.IsLoading && currentItemsCount >= _offsetKnob &&
(e.Container.Content as Medium) != null)
{
if ((e.Container.Content as Medium).Equals((LLS_BooksListAll.ItemsSource as
ObservableCollection<Medium>)[currentItemsCount - _offsetKnob]))
{
_pageNumberAll++;
try
{
await _viewModel.SearchAllViewModel.SearchAll(TB_Search.Text, _pageNumberAll);
}
catch (RestException ex)
{
MessageBox.Show("Connection-Error: LLS_BooksListAll_ItemRealized - " + ex.Message);
}
}
}
}
在ViewModelClass：
public async void SearchAll(string searchword, int pageNumber)
{
if (pageNumber == 1) this.MediumCollection.Clear();
IsLoading = true;
SearchRequest search = new SearchRequest();
String responseString = await search.Get(searchword, SearchRange.all, pageNumber);
MediaUser response = JsonConvert.DeserializeObject<MediaUser>(responseString);
foreach (Medium med in response.media)
{
MediumCollection.Add(med); //Filling the observable collection
}
IsLoading = false;
}
