How to Implement Global Exception Handling in WinForms Applications?

Global exception handling in WinForms applications: intercepting unhandled errors

Effective handling of unhandled exceptions in WinForms applications is critical to prevent unexpected app crashes. By implementing a global exception handler, you can log exceptions to the database and ensure that critical functionality is not interrupted.

Question:

In debug mode, using a try/catch block in Program.cs surrounding Application.Run successfully handles the exception. However, when running the application in non-debug mode, the exception is not caught and the user sees an Unhandled Exception dialog box.

Solution:

To enable global exception handling, follow these steps:

1. Add UI thread exception handler:

    Application.ThreadException += new ThreadExceptionEventHandler(ErrorHandlerForm.Form1_UIThreadException);

2. Set unhandled exception mode:

    Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);

3. Add non-UI thread exception handler:

    AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);

Selective exception handling for debugging:

You can choose to block exception handling during debugging to facilitate error analysis. Wrap the exception handling code with the following conditional:

if (!AppDomain.CurrentDomain.FriendlyName.EndsWith("vshost.exe")) { ... /* 异常处理代码 */ }

Alternatively, you can check if the debugger is attached:

if (!System.Diagnostics.Debugger.IsAttached) { ... /* 异常处理代码 */ }

This ensures that exceptions are only handled when the application is running in production mode.

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