项目牛津视觉API ocr异常Xamarin形式

Question

我在Xamarin wpf上拍摄Iphone上的OCR视觉API时遇到了问题，而在Android上它完美无缺。 在Android和IOS上从图库中挑选图片也可以正常工作。

  

Thread started: #11 Resolved pending breakpoint at 'OcrRecognitionPage.xaml.cs:60,1' to void ComputerVisionSample.OcrRecognitionPage.d__5.MoveNext () [0x00162]. Error while resolving expression: One or more errors occurred.       线程完成：＃9       线程＆＃39;未知＆＃39; （0x9）已退出代码0（0x0）。       线程完成：＃10       线程＆＃39;未知＆＃39; （0xa）已退出代码0（0x0）。       线程开始：＃12       线程开始：＃13       线程开始：＃14       线程完成：＃8       线程＆＃39;未知＆＃39; （0x8）已退出代码0（0x0）。        Unhandled Exception: Microsoft.ProjectOxford.Vision.ClientException: Exception of type 'Microsoft.ProjectOxford.Vision.ClientException' was thrown. Thread finished: #11

源代码：

       public partial class OcrRecognitionPage : ContentPage
        {
            private readonly VisionServiceClient visionClient;
            string sourceLanguage = "en"; 
            string sourceText = ""; 
            public OcrRecognitionPage()
            {
                InitializeComponent();
                this.visionClient = new VisionServiceClient("Your code here");
            }

            private async Task AnalyzePictureAsync(Stream inputFile)
            {
                if (!CrossConnectivity.Current.IsConnected)
                {
                    await DisplayAlert("Network error", "Please check your network connection and retry.", "OK");
                    return null;
                }

                OcrResults ocrResult = await visionClient.RecognizeTextAsync(inputFile);
                return ocrResult;
            }

            private async void TakePictureButton_Clicked(object sender, EventArgs e)
            {
                await CrossMedia.Current.Initialize();

                if (!CrossMedia.Current.IsCameraAvailable || !CrossMedia.Current.IsTakePhotoSupported)
                {
                    await DisplayAlert("No Camera", "No camera available.", "OK");
                    return;
                }

                var file = await CrossMedia.Current.TakePhotoAsync(new StoreCameraMediaOptions
                {
                    SaveToAlbum = false,
                    Name = "test.jpg"
                });

                if (file == null)
                    return;

                Image1.Source = ImageSource.FromStream(() => file.GetStream());

                var ocrResult = await AnalyzePictureAsync(file.GetStream());

                this.BindingContext = null;           
                this.BindingContext = ocrResult;
                sourceLanguage = ocrResult.Language;

                PopulateUIWithRegions(ocrResult);

            }

            private void PopulateUIWithRegions(OcrResults ocrResult)
            {
                // Iterate the regions
                foreach (var region in ocrResult.Regions)
                {
                    // Iterate lines per region
                    foreach (var line in region.Lines)
                    {
                        // For each line, add a panel
                        // to present words horizontally
                        var lineStack = new StackLayout
                        { Orientation = StackOrientation.Horizontal };
                        // Iterate words per line and add the word
                        // to the StackLayout
                        foreach (var word in line.Words)
                        {
                                Text = word.Text };

                            sourceText += textLabel.Text + " "; 

                            lineStack.Children.Add(textLabel);

                        }
                        // Add the StackLayout to the UI
                        this.DetectedText.Children.Add(lineStack);
                    }
                }
            }
     private async void UploadPictureButton_Clicked(object sender, EventArgs e)
            {
                if (!CrossMedia.Current.IsPickPhotoSupported)
                {
                    await DisplayAlert("No upload", "Picking a photo is not supported.", "OK");
                    return;
                }
                var file = await CrossMedia.Current.PickPhotoAsync();
                if (file == null)
                    return;
                Image1.Source = ImageSource.FromStream(() => file.GetStream());

                var ocrResult = await AnalyzePictureAsync(file.GetStream());

                this.BindingContext = ocrResult;
                sourceLanguage = ocrResult.Language;
                PopulateUIWithRegions(ocrResult);
            }
 

有谁知道如何解决它？