wpf global exception handling

App.xaml.cs

// somewhere early in App.xaml.cs
AppDomain.CurrentDomain.UnhandledException += (s, e) =>
    LogUnhandledException((Exception) e.ExceptionObject, "AppDomain.CurrentDomain.UnhandledException");

DispatcherUnhandledException += (s, e) => 
    LogUnhandledException(e.Exception, "Application.Current.DispatcherUnhandledException");

TaskScheduler.UnobservedTaskException += (s, e) => 
    LogUnhandledException(e.Exception, "TaskScheduler.UnobservedTaskException");



// ... and the actual logging (depends on your logging library)
private void LogUnhandledException(Exception exception, string @event)
{
    _log.Exception(exception)
        .Data("Event", @event)
        .Fatal("Unhandled exception");

    // wait until the logmanager has written the entry
    _log.LogManager.FlushEntriesAsOf(DateTimeOffset.Now.AddSeconds(1));
}



/*  hooray the exception was logged!

MyHappyApp.App : Fatal : 11/20/2013 1:44:31 PM -05:00
    Unhandled exception
    Event: AppDomain.CurrentDomain.UnhandledException
    System.NullReferenceException: Object reference not set to an instance of an object.
       at MyHappyApp.UserControls.VendorFrequencyCriteria.<DoSearchAsync>b__6() in d:\Code\MyHappyApp\src\MyHappyApp\UserControls\VendorFrequencyCriteria.xaml.cs:line 119
       at System.Threading.Tasks.Task`1.InnerInvoke()
       at System.Threading.Tasks.Task.Execute()
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
       at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
       at MyHappyApp.UserControls.VendorFrequencyCriteria.<BtnSearchClick>d__0.MoveNext() in d:\Code\MyHappyApp\src\MyHappyApp\UserControls\VendorFrequencyCriteria.xaml.cs:line 92
    --- End of stack trace from previous location where exception was thrown ---
       at System.Runtime.CompilerServices.AsyncMethodBuilderCore.<ThrowAsync>b__0(Object state)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.DispatcherOperation.InvokeImpl()
       at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Windows.Threading.DispatcherOperation.Invoke()
       at System.Windows.Threading.Dispatcher.ProcessQueue()
       at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
       at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
       at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
       at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
       at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
       at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
       at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
       at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
       at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
       at System.Windows.Threading.Dispatcher.Run()
       at System.Windows.Application.RunDispatcher(Object ignore)
       at System.Windows.Application.RunInternal(Window window)
       at System.Windows.Application.Run(Window window)
       at System.Windows.Application.Run()
       at MyHappyApp.App.Main() in d:\Code\MyHappyApp\src\MyHappyApp\obj\x86\Debug\App.g.cs:line 52
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
    Exception Data:
        System.Object: 
    


*/

thank you, this helped me