async void FaceButton_Clicked(object sender, EventArgs e) { var client = new FaceService(); var faces = await client.GetLocalEmotionAsync(file.Path); if (faces == null) { await DisplayAlert("Error", "Can not detect", "OK"); } var sb = new StringBuilder(); sb.Append($"Detected: {faces.Count}\n\n"); foreach (var face in faces) { sb.Append($"Emotion Rsult:\nAge:{face.Age}\nGender:{face.Gender}\nHappiness:{face.Happiness}%\n"); } await DisplayAlert("Face", sb.ToString(), "OK"); }