private async void OnLoginButton(object sender, EventArgs e)
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.ShowLoading();
});
try
{
string username = UsernameEntry.Text;
string password = PasswordEntry.Text;
sessionView = await client.CreateSessionChannelAsync(index, username, password);
}
catch (BadUserException p)
{
IsEnabled = false;
IsVisible = false;
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Error", p.Message, "ok");
return;
}
catch (NotImplementedException)
{
IsEnabled = false;
IsVisible = false;
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Error", "The Endpoint is not supported!", "ok");
return;
}
if (sessionView == null)
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
IsEnabled = false;
IsVisible = false;
await DisplayAlert("Error", "Cannot connect to an OPC UA Server", "OK");
}
else
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
IsEnabled = false;
IsVisible = false;
await DisplayAlert("Info", "Session created successfully", "Ok");
ContentPage sessionPage = new SessionPage(client, sessionView);
sessionPage.Title = "OPC Session Services";
await Navigation.PushAsync(sessionPage);
}
}
async void OnSelected(object sender, ItemTappedEventArgs e)
{
EndpointView selected = e.Item as EndpointView;
int i = storedList.endpointList.IndexOf(selected);
string action = null;
try
{
action = await DisplayActionSheet("Select authentication mode: ", "cancel", null, "Anonymous", "Username & Password");
if (action.Equals("Anonymous"))
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.ShowLoading();
});
try
{
sessionView = await Task.Run(() => client.CreateSessionChannelAsync(i));
}
catch (NotImplementedException)
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Error", "The Endpoint is not supported!", "ok");
return;
}
catch (UnsupportedEndpointException p)
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Error", p.Message, "ok");
return;
}
if (sessionView == null)
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Error", "Cannot connect to an OPC UA Server!", "OK");
}
else
{
Device.BeginInvokeOnMainThread(() =>
{
UserDialogs.Instance.HideLoading();
});
await DisplayAlert("Info", "Session created successfully!", "Ok");
ContentPage sessionPage = new SessionPage(client, sessionView);
sessionPage.Title = "OPC Session Services";
await Navigation.PushAsync(sessionPage);
}
}
else if (action.Equals("Username & Password"))
{
var _loginPopup = new LoginPopupPage(client, i, sessionView);
await Navigation.PushPopupAsync(_loginPopup);
}
}
catch (NullReferenceException)
{
}
}
