Monday, October 03, 2011

.Net and Global Exception Handling in different types of applications

Here is how to handle global exceptions for different types of .Net applications:

1. Asp.Net:
System.Web.HttpApplication.Error event

Usually setup in Global.asax

MSDN: How to: Handle Application-Level errors.
Also see: Complete example for Error Handlers

2. WinForms:

MSDN: Application.ThreadException event

Blog: Top-Level Exception Handling In Windows Forms Applications

// Add the event handler for handling UI thread exceptions to the event.
Application.ThreadException += new ThreadExceptionEventHandler(ErrorHandlerForm.Form1_UIThreadException);

// Set the unhandled exception mode to force all Windows Forms errors to go through
// our handler.

// Add the event handler for handling non-UI thread exceptions to the event. 
AppDomain.CurrentDomain.UnhandledException +=
        new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);

3. Console applications (also should work with Windows Services – havent checked this though):
System.AppDomain.UnhandledException event

MSDN: AppDomain.UnhandledException Event

AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.UnhandledException += new UnhandledExceptionEventHandler(MyHandler);

4. WPF:

MSDN: Application.DispatcherUnhandledException Event

public App() :base() //App.xaml.cs
        this.Dispatcher.UnhandledException += OnDispatcherUnhandledException;

Also see: WPF Global Exception Handler (StackOverflow)

5. Silverlight:
Application.UnhandledException Event

MSDN: Application.UnhandledException Event
Also see: Silverlight Error Handling

public App()//App.xaml.cs
        this.UnhandledException += this.Application_UnhandledException;
private void Application_UnhandledException(object sender,ApplicationUnhandledExceptionEventArgs e)
//handle exception here.

Also take a look at the EntLib Patterns and Practices pack for Silverlight ( {Logging Application Block}

More info:

Best Practices for Handling Exceptions (MSDN)

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