private async void OnServerCustomValidationRequested(StreamWebSocket sender, WebSocketServerCustomValidationRequestedEventArgs args)
{
// In order to call async APIs in this handler, you must first take a deferral and then
// release it once you are done with the operation. The "using" statement
// ensures that the deferral completes when control leaves the block.
bool isValid;
using (Deferral deferral = args.GetDeferral())
{
// Get the server certificate and certificate chain from the args parameter.
isValid = await MainPage.AreCertificateAndCertChainValidAsync(args.ServerCertificate, args.ServerIntermediateCertificates);
if (!isValid)
{
args.Reject();
}
}
// Continue on the UI thread so we can update UI.
var task = Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
{
if (isValid)
{
AppendOutputLine("Custom validation of server certificate passed.");
}
else
{
AppendOutputLine("Custom validation of server certificate failed.");
}
});
}