相关疑难解决方法(0)

有时,在不可重现的情况下,我的WPF应用程序崩溃而没有任何消息.应用程序立即关闭.

实现全局Try/Catch块的最佳位置在哪里.至少我必须实现一个消息框:"抱歉给您带来不便......"

我正在开发一个应用程序,它使用.NET 3.5 sp1和C#从Web加载位图.

加载代码如下:

        try {
            CurrentImage = pics[unChosenPics[index]];
            bi = new BitmapImage(CurrentImage.URI);
            // BitmapImage.UriSource must be in a BeginInit/EndInit block.
            bi.DownloadCompleted += new EventHandler(bi_DownloadCompleted);
            AssessmentImage.Source = bi;
        }
        catch {
            System.Console.WriteLine("Something broke during the read!");
        }

并且在bi_DownloadCompleted上加载的代码是:

    void bi_DownloadCompleted(object sender, EventArgs e) {
        try {
            double dpi = 96;
            int width = bi.PixelWidth;
            int height = bi.PixelHeight;

            int stride = width * 4; // 4 bytes per pixel
            byte[] pixelData = new byte[stride * height];
            bi.CopyPixels(pixelData, stride, 0);

            BitmapSource …

我正试图捕获我的WPF应用程序中的所有异常.我尝试了以下代码,但它不工作我不知道为什么？

<Application x:Class="DBFilter.App"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         StartupUri="MainWindow.xaml"
         Exit="Application_Exit"               
         DispatcherUnhandledException ="AppDispatcherUnhandledException"
         >
<Application.Resources>

</Application.Resources>
</Application>

App.xaml.cs

protected override void OnStartup(StartupEventArgs e)
    {
        AppDomain.CurrentDomain.UnhandledException += new 
UnhandledExceptionEventHandler(AppDomainUnhandledExceptionHandler);
        System.Windows.Forms.Application.ThreadException += new 
ThreadExceptionEventHandler(Application_ThreadException);
        Application.Current.DispatcherUnhandledException += new 
DispatcherUnhandledExceptionEventHandler(AppDispatcherUnhandledException);
}

void AppDomainUnhandledExceptionHandler(object sender, 
UnhandledExceptionEventArgs ea)
    {
        Exception ex = (Exception)ea.ExceptionObject;    
 MessageBox.Show(ex.Exception.InnerException.Message);

    }

void Application_ThreadException(object sender, ThreadExceptionEventArgs e)
    {
        MessageBox.Show(e.Exception.InnerException.Message);
    }                       

void AppDispatcherUnhandledException(object 
sender,DispatcherUnhandledExceptionEventArgs e)
    {
        MessageBox.Show(e.Exception.InnerException.Message);
    }

稍后,我将把所有异常写入日志表.