// 4
private async void btnStart_Click(object sender, RoutedEventArgs e)
{
try
{
tbResult.Text = "";
pbDownload.Value = 0;
// Create an insatnce of Progress Oject
Progress <ProgressReportModel> progress = new Progress <ProgressReportModel>();
// Wire up Progress Change Event
progress.ProgressChanged += Progress_ProgressChanged;
try
{
// Start the Job for Download Website Content and Pass as parameter of progress and cancellation Token Object
await websiteContext?.RunDownloadAsync(progress, cancellationTokenSource.Token);
}
catch (Exception ex) when(ex is OperationCanceledException || ex is TaskCanceledException)
{
tbResult.Text += $"The async download was cancelled. { Environment.NewLine }";
}
finally
{
// if cancellation request true then dispose cancelllation Token
if (cancellationTokenSource.IsCancellationRequested == true)
{
cancellationTokenSource.Dispose();
cancellationTokenSource = new CancellationTokenSource();
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
