DomainCollectionView not changing pages - silverlight-5.0

Question

I'm trying to download lage amout of items from server and to avoid timeouts I'm using paging so what I tried to do is to load the first page and in my DomainCollectionView Loaded method call MoveToNextPage and so on untill all pages are loaded.
When I do that the DCV does not change from page, it remains on page 0, then I tried to refresh inside the PadeChanged event of the DCV but in there the PageIndex is -1 abd when I refresh the load operation is automatically cancelled.
this is my code:
private void OnLoadedPrintingModels(LoadOperation<AppointmentModel> op)
{
if (op.HasError)
{
MessageBox.Show(ApplicationStrings.PrintingConnectionError + Environment.NewLine + op.Error.Message);
op.MarkErrorAsHandled();
this.downloadDialog.Close();
this.TotalPrintCountD = 100.0;
this.downloadDialog = null;
this.printingList.Clear();
this.printingDomainList.Source = null;
}
else if (!op.IsCanceled)
{
if (op.Entities.Any())
{
printingList.AddRange(op.Entities);
if (this.isStartingPrinting)
{
this.TotalPrintCount = op.TotalEntityCount;
this.TotalPrintCountD = (double)op.TotalEntityCount;
this.isStartingPrinting = false;
}
isDownloaded = true;
printingDomainList.Source = op.Entities;
printingDomainView.SetTotalItemCount(op.TotalEntityCount);
}
else
{
MessageBox.Show(ApplicationStrings.NoSearchResults);
isStartingPrinting = true;
this.downloadDialog.Close();
this.TotalPrintCountD = 100.0;
this.downloadDialog = null;
this.printingList.Clear();
this.printingDomainList.Source = null;
DownloadedPrintingItems = 0.0;
}
}
else
{
MessageBox.Show(ApplicationStrings.PrintOperationCanceledByUser);
this.downloadPrintDataCanceled = false;
this.downloadDialog.Close();
this.TotalPrintCountD = 100.0;
this.downloadDialog = null;
this.printingList.Clear();
this.printingDomainList.Source = null;
isStartingPrinting = true;
DownloadedPrintingItems = 0.0;
}
}
bool isDownloaded = false;
void printingDomainView_PageChanged(object sender, EventArgs e)
{
if (isDownloaded)
{
isDownloaded = false;
DownloadedPrintingItems = 100.0 * (double)printingList.Count / this.TotalPrintCountD;
if (printingList.Count < this.TotalPrintCount)
{
using (this.printingDomainView.DeferRefresh())
{
this.printingDomainView.PageSize = PrintingPageSize;
this.printingDomainView.MoveToNextPage();
}
}
else
{
isStartingPrinting = true;
this.downloadDialog.Close();
this.downloadDialog = null;
DownloadedPrintingItems = 0.0;
ConfirmPrintingResults();
}
}
}
I'm trying to do many things here but nothing seems to work. Any help on how to do this will be very appreciated.
Thank you very much in advance.

Answer 1

I finally solved the problem by waiting for DomainCollectionView.IsChangingPage inside a thread using async and await, the resultant code is this:
private **async** void OnLoadedPrintingModels(LoadOperation<AppointmentModel> op)
{
if (op.HasError)
{
MessageBox.Show(ApplicationStrings.PrintingConnectionError + Environment.NewLine + op.Error.Message);
op.MarkErrorAsHandled();
this.downloadDialog.Close();
this.TotalPrintCountD = 100.0;
this.downloadDialog = null;
this.printingList.Clear();
this.printingDomainList.Source = null;
}
else if (!op.IsCanceled)
{
if (op.Entities.Any())
{
printingList.AddRange(op.Entities);
if (this.isStartingPrinting)
{
this.TotalPrintCount = op.TotalEntityCount;
this.TotalPrintCountD = (double)op.TotalEntityCount;
this.isStartingPrinting = false;
}
printingDomainList.Source = op.Entities;
printingDomainView.SetTotalItemCount(op.TotalEntityCount);
**await Task.Factory.StartNew(() =>
{
while (printingDomainView.IsPageChanging)
{
Thread.Sleep(1);
}
});**
DownloadedPrintingItems = 100.0 * (double)printingList.Count / this.TotalPrintCountD;
if (printingList.Count < this.TotalPrintCount)
{
using (this.printingDomainView.DeferRefresh())
{
this.printingDomainView.PageSize = PrintingPageSize;
this.printingDomainView.MoveToNextPage();
}
}
else
{
//this.IsBusy = false;
//this.WaitingMessage = ApplicationStrings.WaitLabel;
isStartingPrinting = true;
this.downloadDialog.Close();
//this.TotalPrintCountD = 100.0;
this.downloadDialog = null;
DownloadedPrintingItems = 0.0;
//Thread.CurrentThread.Join(1);
ConfirmPrintingResults();
}
}
else
{
MessageBox.Show(ApplicationStrings.NoSearchResults);
isStartingPrinting = true;
this.downloadDialog.Close();
this.TotalPrintCountD = 100.0;
this.downloadDialog = null;
this.printingList.Clear();
this.printingDomainList.Source = null;
DownloadedPrintingItems = 0.0;
}
}
else
{
MessageBox.Show(ApplicationStrings.PrintOperationCanceledByUser);
this.downloadPrintDataCanceled = false;
this.downloadDialog.Close();
this.TotalPrintCountD = 100.0;
this.downloadDialog = null;
this.printingList.Clear();
this.printingDomainList.Source = null;
isStartingPrinting = true;
DownloadedPrintingItems = 0.0;
}
}