How Can I Implement Global Exception Handling in WPF to Prevent Unexpected Crashes?

WPF global exception handling mechanism

WPF applications often crash unexpectedly, causing trouble to users and making it difficult for developers to troubleshoot problems. These crashes often have no error message, making it difficult to locate the root cause. To solve this problem, it is crucial to implement a global Try/Catch block that provides meaningful information to the user and prevents the application from being terminated suddenly.

In WPF, there are multiple ways to implement global Try/Catch blocks, each with their own pros and cons:

AppDomain.CurrentDomain.UnhandledException

This event handles exceptions for all threads within the AppDomain. It allows centralized error handling, but debugging specific issues can be more challenging.

Dispatcher.UnhandledException

This event handles exceptions for a single specific UI scheduler thread. It provides finer-grained control over error handling, but may not catch exceptions from background threads.

Application.Current.DispatcherUnhandledException

This event handles exceptions on the WPF application's main UI scheduler thread. It provides a convenient way to handle errors in the core UI thread, but only on that specific thread.

TaskScheduler.UnobservedTaskException

This event handles exceptions in every AppDomain that uses the task scheduler for asynchronous operations. It helps catch background task exceptions that may have been ignored.

The choice of where to implement a global Try/Catch block depends on the specific needs of your application. If centralized error handling is required, AppDomain.CurrentDomain.UnhandledException is a good choice. For more fine-grained control, you can use Dispatcher.UnhandledException or Application.Current.DispatcherUnhandledException. For exceptions handling background tasks, TaskScheduler.UnobservedTaskException should be considered.

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