private void DiscoveryHandler_OnFoundPrinter(object sender, IDiscoveredPrinter discoveredPrinter) { System.Diagnostics.Debug.WriteLine("Found Printer:" + discoveredPrinter.ToString()); Device.BeginInvokeOnMainThread(() => { if (!PrinterList.Contains(discoveredPrinter)) { PrinterList.Add(discoveredPrinter); } }); }