什么是导致我的WP7应用程序崩溃？ [英] What's causing my WP7 app to crash?

问题描述

我已经在模拟器和手机本身发生了一些不明原因的崩溃。基本上当我的应用程序崩溃时，我没有任何对话框，手机返回主屏幕。

我有以下代码来显示一个MessageBox，但这是以某种方式绕过...

  //导航失败时执行的代码
 private void RootFrame_NavigationFailed（object sender，NavigationFailedEventArgs e） 
 {
 MessageBox.Show（e.Exception.ToString（））; 
} 
 
 //未处理异常执行的代码
 private void Application_UnhandledException（object sender，ApplicationUnhandledExceptionEventArgs e）
 {
 MessageBox.Show（e。 ExceptionObject.ToString（））; 
} 
  

我认为这可能与内存相关，因为我的应用程序处理大量图像。但是，我认为，仍然会被我上面未处理的异常代码所捕获。任何有关如何追踪这一点的想法将不胜感激。

解决方案

关注您的内存使用情况。 OutOfMemoryException在不调用Application_UnhandledException处理程序的情况下崩溃您的应用程序。
您可以使用一些内置方法检查当前内存使用情况。之前我曾经发布过 http：//kodierer.blogspot。 com / 2010/09 / windows-phone-memory-constraints.html

这是您应该添加的基本代码：

  var timer = new DispatcherTimer {Interval = TimeSpan.FromSeconds（2）}; 
 timer.Tick + =（s，e）=> 
 {
 var memuse =（long）DeviceExtendedProperties.GetValue（ApplicationPeakMemoryUsage）; 
 var maxmem =（long）DeviceExtendedProperties.GetValue（DeviceTotalMemory）; 
 memuse / = 1024 * 1024; 
 maxmem / = 1024 * 1024; 
 MyTextBlock.Text = String.Format（Mem usage：{0} / {1} MB，memuse，maxmem）; 
}; 
 timer.Start（）; 
  

I've had a few unexplained crashes happening on both the emulator and the phone itself. Basically when my app crashes I get no dialog box whatsoever and the phone returns to the home screen.

I have the following code to display a MessageBox but this is somehow being bypassed...

// Code to execute if a navigation fails
private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
{
    MessageBox.Show(e.Exception.ToString());
}

// Code to execute on Unhandled Exceptions
private void Application_UnhandledException(object sender, ApplicationUnhandledExceptionEventArgs e)
{
    MessageBox.Show(e.ExceptionObject.ToString());
}

The thought occurred to me that it might be related to memory, since my app deals with a lot of images. But I figure that would still be caught by my unhandled exception code above. Any ideas on how I should track this down would be appreciated.

解决方案

Keep an eye on your memory usage. An OutOfMemoryException crashes your app without calling the Application_UnhandledException handler. You can check the current memory usage with some built in methods. I blogged about this a while ago http://kodierer.blogspot.com/2010/09/windows-phone-memory-constraints.html

Here's the basic code you should add:

var timer = new DispatcherTimer {Interval = TimeSpan.FromSeconds(2)};
timer.Tick += (s, e) =>
{
   var memuse = (long)DeviceExtendedProperties.GetValue("ApplicationPeakMemoryUsage");
   var maxmem = (long)DeviceExtendedProperties.GetValue("DeviceTotalMemory");
   memuse /= 1024 * 1024;
   maxmem /= 1024 * 1024;
   MyTextBlock.Text = String.Format("Mem usage: {0} / {1} MB", memuse, maxmem);
};
timer.Start();

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