// Click handler for the login button.
private void LoginButtonClick(object sender, EventArgs e)
{
try
{
// Get information for the login.
string username = _usernameTextbox.Text;
string password = _passwordTextbox.Text;
// Make sure all required info was entered.
if (String.IsNullOrEmpty(username) || String.IsNullOrEmpty(password))
{
throw new Exception("Please enter a username and password.");
}
// Create a new OnEnterCredentialsEventArgs object to store the information entered by the user.
OnEnterCredentialsEventArgs credentialsEnteredArgs = new OnEnterCredentialsEventArgs(username, password);
// Raise the OnLoginClicked event so the main activity can handle the event and try to authenticate with the credentials.
OnLoginClicked?.Invoke(this, credentialsEnteredArgs);
// Close the dialog.
this.Dismiss();
}
catch (Exception ex)
{
// Show the exception message (dialog will stay open so user can try again).
AlertDialog.Builder alertBuilder = new AlertDialog.Builder(this.Activity);
alertBuilder.SetTitle("Error");
alertBuilder.SetMessage(ex.Message);
alertBuilder.Show();
}
}
// Handler for the OnLoginClicked event defined in the LoginDialogFragment.
// OnEnterCredentialsEventArgs contains the username and password the user entered.
private async void LoginClicked(object sender, OnEnterCredentialsEventArgs e)
{
// If no login information is available from the Task, return.
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 = (CredentialRequestInfo)_loginTaskCompletionSource.Task.AsyncState;
// 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)
{
_loginTaskCompletionSource.TrySetException(ex);
}
finally
{
// Set the task completion source to null to indicate authentication is complete.
_loginTaskCompletionSource = null;
}
}