private void LoginCanceled(object sender, EventArgs e)
{
// Remove the login UI.
_loginUI.Hide();
_loginUI = null;
// Cancel the task completion source task.
_loginTaskCompletionSource.TrySetCanceled();
}
private void ShowLoginUI()
{
// Get the URL for the service being requested.
var info = _loginTaskCompletionSource.Task.AsyncState as CredentialRequestInfo;
var serviceUrl = info.ServiceUri.GetLeftPart(UriPartial.Path);
// Create a view to show login controls over the map view.
var ovBounds = new CoreGraphics.CGRect(0, 80, _myMapView.Bounds.Width, _myMapView.Bounds.Height - 80);
_loginUI = new LoginOverlay(ovBounds, 0.85f, UIColor.DarkGray, serviceUrl);
// Handle the login event to get the login entered by the user.
_loginUI.OnLoginInfoEntered += LoginEntered;
// Handle the cancel event when the user closes the dialog without entering a login.
_loginUI.OnCanceled += LoginCanceled;
// Add the login UI view (will display semi-transparent over the map view)
View.Add(_loginUI);
}
// Handle the OnLoginEntered event from the login UI.
// LoginEventArgs contains the username and password that were entered.
private async void LoginEntered(object sender, LoginEventArgs e)
{
// Make sure the task completion source has all the information needed.
if (_loginTaskCompletionSource == null ||
_loginTaskCompletionSource.Task == null ||
_loginTaskCompletionSource.Task.AsyncState == null)
{
return;
}
try
{
// Get the associated CredentialRequestInfo (will need the URI of the service being accessed).
CredentialRequestInfo requestInfo = _loginTaskCompletionSource.Task.AsyncState as CredentialRequestInfo;
// Create a token credential using the provided username and password.
TokenCredential userCredentials = await AuthenticationManager.Current.GenerateCredentialAsync
(requestInfo.ServiceUri,
e.Username,
e.Password,
requestInfo.GenerateTokenOptions);
// Set the result on the task completion source.
_loginTaskCompletionSource.TrySetResult(userCredentials);
}
catch (Exception ex)
{
// Unable to create credential, set the exception on the task completion source.
_loginTaskCompletionSource.TrySetException(ex);
}
finally
{
// Get rid of the login controls.
_loginUI.Hide();
_loginUI = null;
}
}