private async Task ListAllPersonInGroup()
        {
            var client = new HttpClient();

            client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
            string listallpersonIngrouprequest = uriFace + "/persongroups/group1/persons";
            var    response = await client.GetAsync(listallpersonIngrouprequest);

            string json = await response.Content.ReadAsStringAsync();

            allperson = await Myjson.ToObjectAsync <List <PersonsInFaceGroup> >(json);

            if (allperson.Count > 0)
            {
                foreach (var item in allperson)
                {
                    if (!FaceDictionary.ContainsKey(item.personId))
                    {
                        FaceDictionary.Add(item.personId, item.name);
                    }
                }
            }
        }
        private async void DoorBell_Click(object sender, RoutedEventArgs e)
        {
            DoorBell.IsEnabled = false;
            ImageEncodingProperties imageFormat = ImageEncodingProperties.CreateJpeg();
            StorageFile             file        = await ApplicationData.Current.LocalCacheFolder.CreateFileAsync($"{DateTime.Now.ToFileTime()}.jpg", CreationCollisionOption.GenerateUniqueName);

            await captureManager.CapturePhotoToStorageFileAsync(imageFormat, file);

            Stream stream = await file.OpenStreamForReadAsync();

            BinaryReader binaryReader = new BinaryReader(stream);

            byte[] imagedata = binaryReader.ReadBytes((int)stream.Length);

            ByteArrayContent byteArrayContent = new ByteArrayContent(imagedata);
            var client = new HttpClient();

            client.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
            string requestuir = uriFace + "detect?returnFaceId=true";// &returnFaceLandmarks=true&returnFaceAttributes=age,gender,headPose,smile,facialHair,glasses,emotion,hair,makeup,occlusion,accessories,blur,exposure,noise";

            byteArrayContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            var responseMessage = await client.PostAsync(requestuir, byteArrayContent);

            if (responseMessage.StatusCode.ToString() == "OK")
            {
                string detectjson = await responseMessage.Content.ReadAsStringAsync();

                detectFaces = await Myjson.ToObjectAsync <List <MyDetectFace> >(detectjson);

                if (detectFaces.Count > 0)
                {
                    BitmapImage image = new BitmapImage(new Uri(file.Path));
                    //visitors.Add(new Visitor { VisitDate = System.DateTime.Now.ToString(), VisitorImage = image });

                    var    identifyclient = new HttpClient();
                    string identifyUri    = uriFace + "identify";
                    identifyclient.DefaultRequestHeaders.Add("Ocp-Apim-Subscription-Key", subscriptionKey);
                    string requestjson = "{\"personGroupId\":\"" + groupId + "\",\"faceIds\":[\"" + detectFaces[0].faceId + "\"],\"maxNumOfCandidatesReturned\": 1,\"confidenceThreshold\": 0.5}";

                    HttpContent httpContent = new StringContent(requestjson);
                    httpContent.Headers.ContentType = new MediaTypeHeaderValue("application/json");

                    HttpResponseMessage httpResponseMessage = await client.PostAsync(identifyUri, httpContent);

                    if (httpResponseMessage.StatusCode.ToString() == "OK")
                    {
                        string identifyjson = await httpResponseMessage.Content.ReadAsStringAsync();

                        identifyFaces = await Myjson.ToObjectAsync <List <MyIdentifyFace> >(identifyjson);

                        if (identifyFaces[0].candidates.Count > 0)
                        {
                            //树莓派崩了的点
                            if (identifyFaces[0].candidates[0].confidence > confidenceThreshold)
                            {
                                DebugText.Text = identifyFaces[0].candidates[0].confidence.ToString();
                                if (FaceDictionary.ContainsKey(identifyFaces[0].candidates[0].personId))
                                {
                                    DebugText.Text = FaceDictionary.ContainsKey(identifyFaces[0].candidates[0].personId).ToString();
                                    PersonsInFaceGroup person = allperson.Find(x => x.personId.Contains(identifyFaces[0].candidates[0].personId));
                                    string             words  = $"欢迎回来,{person.userData}{FaceDictionary[identifyFaces[0].candidates[0].personId]}";
                                    visitors.Add(new Visitor {
                                        VisitDate = System.DateTime.Now.ToString(), VisitorImage = image, Name = FaceDictionary[identifyFaces[0].candidates[0].personId]
                                    });

                                    MySpeechHelper.SaySomething(words, myFaceDetectMediaElement);
                                    MyNotificationHelper.SendNotification(file.Path, FaceDictionary[identifyFaces[0].candidates[0].personId], person.userData);
                                }
                            }
                        }
                        else
                        {
                            string words = "对不起!我好像不认识你哦!";
                            visitors.Add(new Visitor {
                                VisitDate = System.DateTime.Now.ToString(), VisitorImage = image, Name = "陌生人"
                            });

                            MySpeechHelper.SaySomething(words, myFaceDetectMediaElement);
                            MyNotificationHelper.SendNotification(file.Path);
                        }
                    }
                }
                else
                {
                    string words = "你是不是逗我玩呢?能看着镜头吗?再试一次,我就不信了!";
                    MySpeechHelper.SaySomething(words, myFaceDetectMediaElement);
                }
            }
            DoorBell.IsEnabled = true;
        }