/// <summary>
/// Asynchronously loads the next page of data results into the <see cref="T:System.Data.Services.Client.DataServiceCollection`1"/>.
/// </summary>
/// <typeparam name="T">Entity type of the <see cref="T:System.Data.Services.Client.DataServiceCollection`1"/> instance.</typeparam>
/// <param name="bindingCollection">The <see cref="T:System.Data.Services.Client.DataServiceCollection`1"/> instance on which this extension method is enabled.</param>
/// <returns>A <see cref="T:System.Threading.Tasks.Task`1"/> that, when completed, returns a <see cref="T:System.Data.Services.Client.LoadCompletedEventArgs"/>.</returns>
public static async Task <LoadCompletedEventArgs> LoadNextPartialSetAsync <T>(this DataServiceCollection <T> bindingCollection)
{
var tcs = new TaskCompletionSource <LoadCompletedEventArgs>();
EventHandler <LoadCompletedEventArgs> handler = delegate(object o, LoadCompletedEventArgs e)
{
if (e.Error != null)
{
tcs.TrySetException(e.Error);
}
else if (e.Cancelled)
{
tcs.TrySetCanceled();
}
else
{
tcs.TrySetResult(e);
}
};
bindingCollection.LoadCompleted += handler;
bindingCollection.LoadNextPartialSetAsync();
LoadCompletedEventArgs eventArgs = await tcs.Task;
bindingCollection.LoadCompleted -= handler;
return(eventArgs);
}
// Handles the LoadCompleted event.
private void Photos_LoadCompleted(object sender, LoadCompletedEventArgs e)
{
if (e.Error == null)
{
// Make sure that we load all pages of the Customers feed.
if (_photos.Continuation != null)
{
// Request the next page from the data service.
_photos.LoadNextPartialSetAsync();
}
else
{
// All pages are loaded.
IsDataLoaded = true;
}
}
else
{
if (MessageBox.Show(e.Error.Message, "Retry request?",
MessageBoxButton.OKCancel) == MessageBoxResult.OK)
{
this.LoadData();
}
}
}
//This is akin to ServiceConnected in Android Map2DOnline
private static void buildings_LoadCompleted(object sender, LoadCompletedEventArgs e)
{
if (e.Error == null)
{
// Handling for a paged data feed.
if (buildings.Continuation != null)
{
// Automatically load the next page.
buildings.LoadNextPartialSetAsync();
}
else
{
//The data is ready
foreach (Building b in buildings)
{
CurrentBuilding = b;
//TODO: Currently, LoadEdges just loops through the edges and does nothing
LoadEdges(CurrentBuilding);
break;
}
}
}
else
{
CurrentBuilding = null;
}
//Now notify the observers
//we just let the observers know that something has happened.
//They can then check if CurrentBuilding != null
//TODO: MAYBE just replace this with WifiStatusChanged, where the Status is RADIOMAP_DOWNLOADED
if (OnBuildingDownload != null) //any observers?
OnBuildingDownload(null, null);
}
public void LoadAsyncTest()
{
var context = this.CreateWrappedContext <DefaultContainer>().Context;
var query = context.Customer;
var dataServiceCollection = new DataServiceCollection <Customer>();
dataServiceCollection.LoadCompleted +=
(sender, e) =>
{
if (e.Error == null)
{
if (dataServiceCollection.Continuation != null)
{
dataServiceCollection.LoadNextPartialSetAsync();
}
else
{
this.EnqueueTestComplete();
Assert.Equal(10, dataServiceCollection.Count);
}
}
};
dataServiceCollection.LoadAsync(query);
this.WaitForTestToComplete();
}
/// <summary>
/// Invoked when a filter is selected using the ComboBox in snapped view state.
/// </summary>
/// <param name="sender">The ComboBox instance.</param>
/// <param name="e">Event data describing how the selected filter was changed.</param>
void Filter_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
// Determine what filter was selected
var selectedFilter = e.AddedItems.FirstOrDefault() as Filter;
if (selectedFilter != null)
{
// Mirror the results into the corresponding Filter object to allow the
// RadioButton representation used when not snapped to reflect the change
selectedFilter.Active = true;
// TODO: Respond to the change in active filter by setting this.DefaultViewModel["Results"]
// to a collection of items with bindable Image, Title, Subtitle, and Description properties
DefaultViewModel["Results"] = null; // clear previous result
DefaultViewModel["Results"] = new ObservableCollection <SearchResult>();
var searchText = DefaultViewModel["QueryText"] as string;
if (!String.IsNullOrEmpty(searchText))
{
NetflixCatalog catalog = new NetflixCatalog(netflixServiceUri);
var query = catalog.Titles.Where(t => t.Name.Contains(searchText)).Select(t => t);
var queryResults = new DataServiceCollection <Title>();
queryResults.LoadCompleted +=
(o, args) =>
{
if (queryResults.Continuation != null)
{
queryResults.LoadNextPartialSetAsync();
}
else
{
DefaultViewModel["Results"] = queryResults.Select(t =>
new
{
Title = t.Name,
Subtitle = t.ShortName,
Description = t.ShortSynopsis,
Image = t.BoxArt.MediumUrl
}).ToList();
// ensure that results are found
object results;
ICollection resultsCollection;
if (this.DefaultViewModel.TryGetValue("Results", out results) &&
(resultsCollection = results as ICollection) != null &&
resultsCollection.Count != 0)
{
VisualStateManager.GoToState(this, "ResultsFound", true);
}
}
};
queryResults.LoadAsync(query);
}
}
// Display informational text when there are no search results.
VisualStateManager.GoToState(this, "NoResultsFound", true);
}
private void OnTitlesLoaded(object sender, LoadCompletedEventArgs e)
{
if (e.Error == null)
{
// Get the binding collection, which is the sender.
DataServiceCollection <Title> loadedTitles = sender as DataServiceCollection <Title>;
if (loadedTitles != null)
{
// Make sure that we load all pages of the Customers feed.
if (loadedTitles.Continuation != null)
{
loadedTitles.LoadNextPartialSetAsync();
}
// Set the total page count, if we requested one.
if (e.QueryOperationResponse.Query
.RequestUri.Query.Contains("$inlinecount=allpages"))
{
this.TotalCount = (int)e.QueryOperationResponse.TotalCount;
}
try
{
localDb.Titles.InsertAllOnSubmit <Title>(loadedTitles);
// We want to try and add all the entities even if they already exist.
localDb.SubmitChanges(ConflictMode.ContinueOnConflict);
}
catch (Exception)
{
// We don't care about general exceptions, which inculude SQL CE constraint
// violations when we try to store the same entity twice,
// so we just eat the error.
}
// Unregister the event handler.
loadedTitles.LoadCompleted -= OnTitlesLoaded;
// Set the binding collection to the loaded titles.
this.Titles = loadedTitles;
IsDataLoaded = true;
}
}
else
{
// Display the error message in the binding.
this.Message = e.Error.Message;
}
if (LoadCompleted != null)
{
LoadCompleted(this, new SourcesLoadCompletedEventArgs(e.Error));
}
}
async void Collection_LoadCompleted(object sender, LoadCompletedEventArgs e)
{
if (e.Error == null)
{
if (_collection.Continuation != null)
{
_collection.LoadNextPartialSetAsync();
}
TitleGrid.UpdateLayout();
}
else
{
var dialog = new MessageDialog(e.Error.Message);
await dialog.ShowAsync();
}
}
private void complete(object sender, LoadCompletedEventArgs e)
{
if (e.Error == null)
{
if (inventories.Continuation != null)
{
inventories.LoadNextPartialSetAsync();
}
else
{
foreach (var inv in inventories)
{
if (inv.id == 1000)
{
break;
}
}
}
}
}
private void goods_complete(object sender, LoadCompletedEventArgs e)
{
if (e.Error == null)
{
if (goodses.Continuation != null)
{
goodses.LoadNextPartialSetAsync();
}
else
{
foreach (var goods in goodses)
{
if (goods.id == 9999)
{
break;
}
}
}
}
}
void products_LoadCompleted(object sender, LoadCompletedEventArgs e)
{
if (e.Error == null)
{
// Handling for a paged data feed.
if (products.Continuation != null)
{
// Automatically load the next page.
products.LoadNextPartialSetAsync();
}
else
{
// Set the data context of the list box control to the sample data.
//this.MainLongListSelector.DataContext = products;
this.MainLongListSelector.ItemsSource = products;
}
}
else
{
MessageBox.Show(string.Format("An error has occurred: {0}", e.Error.Message));
}
}
protected override void LoadState(Object navigationParameter, Dictionary <String, Object> pageState)
{
// Initialize.
oDataContext = new DataServiceContext(new Uri("http://apressodataservice.cloudapp.net/ApressOData.svc"));
bookListFromService = new DataServiceCollection <ApressODataService.ApressBook>(oDataContext);
// Fetch all the entities.
Uri query = new Uri("/ApressBooks", UriKind.Relative);
// Custom queries.
//var bookCatalog = new ApressBookDBEntities(new Uri("http://apressodataservice.cloudapp.net/ApressOData.svc"));
//var customQuery = (from Book in bookCatalog.ApressBooks
// where Book.ApressBookTechnology == "Windows Phone"
// select Book).Take(5);
// Asynchronously load the fresh data from Service.
bookListFromService.LoadAsync(query);
// bookListFromService.LoadAsync(customQuery);
// Completion event handler.
bookListFromService.LoadCompleted += (sender, args) =>
{
if (args.Error != null)
{
// Do appropriate error handling.
}
else
{
// Success. Bind to UI.
this.odataBookListView.ItemsSource = bookListFromService;
}
};
if (bookListFromService.Continuation != null)
{
bookListFromService.LoadNextPartialSetAsync();
}
}
public void LoadAsyncTest()
{
var context = this.CreateWrappedContext<DefaultContainer>().Context;
var query = context.Customer;
var dataServiceCollection = new DataServiceCollection<Customer>();
dataServiceCollection.LoadCompleted +=
(sender, e) =>
{
if (e.Error == null)
{
if (dataServiceCollection.Continuation != null)
{
dataServiceCollection.LoadNextPartialSetAsync();
}
else
{
this.EnqueueTestComplete();
Assert.AreEqual(10, dataServiceCollection.Count);
}
}
};
dataServiceCollection.LoadAsync(query);
this.WaitForTestToComplete();
}
