private async Task InitializeAsync()
{
// Test if download path has been specified by user, if not, prompt
// If download path exists, check if valid
if (string.IsNullOrEmpty(Settings.Default.DownloadPath) || !Directory.Exists(Settings.Default.DownloadPath))
{
this.PromptUserForDownloadDirectory();
}
// Test if AppViewModel singleton instance exists
if (AppViewModel.Instance == null)
{
// Set data context for the main screen and load main screen
AppViewModel.Instance = AppViewModel.Create();
this.DataContext = AppViewModel.Instance;
}
// Make instance of the DownloadViewModel and set it as datacontext.
// This will set the active view as the DownloadView
try
{
var downloadViewModel = new DownloadViewModel();
AppViewModel.Instance.DisplayViewModel = downloadViewModel;
await downloadViewModel.ConnectToPortalAsync();
}
catch (Exception ex)
{
// If unexpected exception happens during download, ignore it and load existing map
System.Windows.MessageBox.Show(
"An error has occured during the map download: " + ex.Message + " The previously downloaded map will now be loaded.",
"Unhandled Exception",
MessageBoxButton.OK,
MessageBoxImage.Error);
}
finally
{
await this.LoadMmpkAsync();
}
}