demo3.xaml.cs

private async Task GetEmotion(string imageUri)
        {
            var client = new HttpClient();
            var queryString = HttpUtility.ParseQueryString(string.Empty);

            // Request headers
            client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", "Your_key_Bing_Emotion_API");

            // Request parameters
            var uri = "https://westus.api.cognitive.microsoft.com/emotion/v1.0/recognize?" + queryString;
            EmotionRequest request = new EmotionRequest();
            request.url = imageUri;
            byte[] byteData = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(request));

            using (var content = new ByteArrayContent(byteData))
            {
                content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
                var response = await client.PostAsync(uri, content);
                var json = await response.Content.ReadAsStringAsync();
                if (response.IsSuccessStatusCode)
                {
                    List<EmotionResponse> emotionResponse =
                        JsonConvert.DeserializeObject<List<EmotionResponse>>(json);

                    if (emotionResponse != null && emotionResponse.Count > 0)
                    {
                        var scores = emotionResponse[0].scores;
                        Dictionary<string, double> dScores = new Dictionary<string, double>();
                        dScores.Add("anger", scores.anger);
                        dScores.Add("contempt", scores.contempt);
                        dScores.Add("disgust", scores.disgust);
                        dScores.Add("fear", scores.fear);
                        dScores.Add("happiness", scores.happiness);
                        dScores.Add("neutral", scores.neutral);
                        dScores.Add("sadness", scores.sadness);
                        dScores.Add("surprise", scores.surprise);
                        var highestScore = dScores.Values.OrderByDescending(score => score).First();
                        //probably a more elegant way to do this.
                        var highestEmotion = dScores.Keys.First(key => dScores[key] == highestScore);

                        await Application.Current.Dispatcher.BeginInvoke(
                            DispatcherPriority.Normal,
                            new Action(
                                () =>
                                {
                                    this.MySpeechSentiment.Text = $"Emotion: {highestEmotion},";
                                    this.MySpeechSentimentConfidence.Text =
                                        $"confidence: {Convert.ToInt16(highestScore * 100)}%";
                                }));
                        
                    }
                    else
                    {
                        this.MySpeechSentiment.Text = $"I'm not able to get the emotion, sorry.";
                    }
                }
                else
                {
                    await Application.Current.Dispatcher.BeginInvoke(
                        DispatcherPriority.Normal,
                        new Action(() => { this.MySpeechSentiment.Text = "Could not get emotion from this image";
                        }));
                    
                }
            }

        }