Question

应用程序在连接到PC并使用调试器运行时有效。当我从PC断开手机，从手机运行应用程序并尝试打开图库并将图像设置为图像控制时，问题就出现了。我尝试在try / catch上的文件中写入错误但是从不调用catch，就像应用程序执行时没有错误一样。

这是我选择img：

的代码

private async void galleryBtn_Click(object sender, RoutedEventArgs e)
        {
            try
            {
                FileOpenPicker filePicker = new FileOpenPicker();
                filePicker.SuggestedStartLocation = PickerLocationId.PicturesLibrary;
                filePicker.ViewMode = PickerViewMode.Thumbnail;

                // Filter to include a sample subset of file types
                filePicker.FileTypeFilter.Clear();
                filePicker.FileTypeFilter.Add(".bmp");
                filePicker.FileTypeFilter.Add(".png");
                filePicker.FileTypeFilter.Add(".jpeg");
                filePicker.FileTypeFilter.Add(".jpg");

                filePicker.PickSingleFileAndContinue();
                view.Activated += viewActivated;

            }
            catch (Exception err)
            {
                string error = err.StackTrace.ToString();
                await saveStringToLocalFile("test11", error);
            }
        }

而不是：

 private async void viewActivated(CoreApplicationView sender, IActivatedEventArgs args1)
        {
            try
            {
                FileOpenPickerContinuationEventArgs args = args1 as FileOpenPickerContinuationEventArgs;

                if (args != null)
                {
                    if (args.Files.Count == 0) return;

                    view.Activated -= viewActivated;
                    StorageFile storageFile = args.Files[0];
                    var stream = await storageFile.OpenAsync(Windows.Storage.FileAccessMode.Read);
                    var bitmapImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage();
                    await bitmapImage.SetSourceAsync(stream);

                    var decoder = await Windows.Graphics.Imaging.BitmapDecoder.CreateAsync(stream);
                    var obj = App.Current as App;
                    obj.ImageToEdit = bitmapImage;
                    obj.fileTransfer = storageFile;
                    checkTorch = -1;
                    await newCapture.StopPreviewAsync();
                    Frame.Navigate(typeof(EditImage));
                }
            }
            catch (Exception err) {
                string error = err.StackTrace.ToString();
                await saveStringToLocalFile("test11", error);
            }
        }

当选择img时，我打开屏幕进行图像编辑并运行

 protected override async void OnNavigatedTo(NavigationEventArgs e)
        {
            try
            {

                var obj = App.Current as App;
                slika = obj.ImageToEdit;
                original = obj.ImageToEdit;
                ImagePreview.Source = slika;
                RotateTransform myRotateTransform = new RotateTransform();
                myRotateTransform.Angle = 0;
                ImagePreview.RenderTransform = myRotateTransform;
                var localSettings = ApplicationData.Current.LocalSettings;
            }
            catch (Exception err)
            {
                string error = err.StackTrace.ToString();
                await saveStringToLocalFile("test11", error);
            }

        }

就是这样，任何建议都表示赞赏;

Answer 1

问题在于我的MediaCapture。首先使用mediaCapture.stopPreviewAsync（）;要停止预览，您必须释放mediaCapture。在调用fileOpener之前，请使用以下代码：

newCapture.Dispose();

Answer 2

为了捕获未处理的异常，您可以使用全局异常捕获器，在App.xaml.cs文件中定义：

public App()
{
   this.InitializeComponent();
   this.Suspending += this.OnSuspending;
   this.UnhandledException += UnhandledExceptionHandler;
}

private void UnhandledExceptionHandler(object sender, UnhandledExceptionEventArgs e)
{
   log.Critical(e.Exception);
}

重要的是要理解并非所有异常都可以使用try \ catch捕获，例如Corrupt State Exceptions： https://msdn.microsoft.com/en-us/magazine/dd419661.aspx#id0070035

在这种情况下，您可以通过查看应用程序生成的.dmp文件来调试问题：{Phone} \ Documents \ Debug

当Wp 8.1应用程序未连接到调试器

2 个答案: