void downloadworker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
var s = new StringBuilder();
s.Append(this.downloadercontext.NumSuccess + " tiles were downloaded.\r\n");
if (this.downloadercontext.NumFailure > 0)
s.Append(this.downloadercontext.NumFailure + " tiles were failed.\r\n");
MessageBox.Show(s.ToString(), "Download Result", MessageBoxButton.OK);
this.downloadercontext = null;
}
void downloadworker_DoWork(object sender, DoWorkEventArgs e)
{
var selection = (TileSelection)e.Argument;
this.downloadercontext = new DownloaderContext(selection.NumTotalTiles);
this.BeginDownload(selection, e);
}
