在 WPF 中捕获子线程中未处理的异常
我有一个可以分离多个线程的 WPF 应用程序。我在 App.xaml.cs 中定义了一个 DispatcherUnhandledException 事件处理程序，用于显示详细的错误消息，并且每次 UI 线程遇到异常时都会调用该处理程序。问题出在子线程上：它们未处理的异常永远不会得到处理。我该怎么做？
示例代码：
private void Application_DispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
{
MessageBox.Show("detailed error message");
}
private void Application_Startup(object sender, StartupEventArgs e)
{
//...
//If an Exception is thrown here, it is handled
//...
Thread[] threads = new Thread[numThreads];
for(int i = 0; i < numThreads; i++)
{
threads[i] = new Thread(doWork);
threads[i].Start();
}
}
private void doWork()
{
//...
//Exception thrown here and is NOT handled
//...
}
编辑： 一旦发生未处理的异常，我想显示带有堆栈跟踪的错误消息，然后退出应用程序。
I have a WPF application that spins off several threads. I have defined a DispatcherUnhandledException event handler in App.xaml.cs that displays a detailed error message, and this handler gets called every time the UI thread encounters an exception. The problem is with the child threads: their unhandled exceptions never get handled. How do I do this?
Sample code:
private void Application_DispatcherUnhandledException(object sender, System.Windows.Threading.DispatcherUnhandledExceptionEventArgs e)
{
MessageBox.Show("detailed error message");
}
private void Application_Startup(object sender, StartupEventArgs e)
{
//...
//If an Exception is thrown here, it is handled
//...
Thread[] threads = new Thread[numThreads];
for(int i = 0; i < numThreads; i++)
{
threads[i] = new Thread(doWork);
threads[i].Start();
}
}
private void doWork()
{
//...
//Exception thrown here and is NOT handled
//...
}
Edit: Once an unhandled exception occurs, I want to display an error message with a stack trace, and then exit the application.
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尝试连接到 AppDomain.CurrentDomain.UnhandledException 事件以及。
Try hooking up to the AppDomain.CurrentDomain.UnhandledException event as well.
这是设计使然，您应该在 DoWork 的顶层使用 try/catch。一些线程模型可以满足这一点，请查看Backgroundworker 的示例。
.NET 4 Task 类为这个问题提供了一个很好的接口。在那之前，您必须自己处理它，或者使用 BGW 或 IAsyncResult 模型。
This is by design, you should use a try/catch at the top-level of DoWork. Some threading models cater for this, take a look at the Backgroundworker for an example.
The .NET 4 Task class provides a nice interface to this problem. Until then, you will have to take care of it yourself, or use the BGW or IAsyncResult models.