MessageBox not showing when "Unhandled Exception" triggers in winforms - winforms

Question

so I was trying to add "AppDomain.CurrentDomain.UnhandledException" handler to my application and it worked OK if I log the error to a text file. but when I try to use a MessageBox it never pops. is it another bug in .Net? any ideas?
here is my code sample:
AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
and here is my handler method:
static void CurrentDomain_UnhandledException (object sender, UnhandledExceptionEventArgs e)
{
try
{
Exception ex = (Exception)e.ExceptionObject;
MessageBox.Show("Whoops! Please contact the developers with "
+ "the following information:\r\n\r\n" + ex.Message + ex.StackTrace,
"Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
finally
{
Application.Exit();
}
}
EDIT: I've tried all of the possible options but I still can't see the MessageBox. Now the problem is when I run it from Visual C# (debug mode) it perfectly shows the box. but when I run the application directly from the debug/release folders it doesn't shows the MessageBox and the Application keeps running like there is no error is happening...

Answer 1

this example works for me in debug mode and release mode with vs2010 or not:
using System;
using System.Windows.Forms;
namespace WinFormsStackOverflowSpielWiese
{
internal static class Program
{
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
private static void Main() {
System.Windows.Forms.Application.ThreadException += new System.Threading.ThreadExceptionEventHandler(Application_ThreadException);
System.Windows.Forms.Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
private static void Application_ThreadException(object sender, System.Threading.ThreadExceptionEventArgs e) {
try {
var exception = e.Exception != null ? e.Exception.Message + e.Exception.StackTrace : string.Empty;
MessageBox.Show("Whoops! Please contact the developers with the following information:\r\n\r\n" + exception,
"Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
finally {
Application.Exit();
}
}
private static void CurrentDomain_UnhandledException(object sender, UnhandledExceptionEventArgs e) {
try {
var exception = e.ExceptionObject is Exception ? ((Exception)e.ExceptionObject).Message + ((Exception)e.ExceptionObject).StackTrace : string.Empty;
MessageBox.Show("Whoops! Please contact the developers with the following information:\r\n\r\n" + exception,
"Fatal Error", MessageBoxButtons.OK, MessageBoxIcon.Stop);
}
finally {
Application.Exit();
}
}
}
}
code for the form
EDIT now with a timer, with the same result....
using System.Windows.Forms;
namespace WinFormsStackOverflowSpielWiese
{
public partial class Form1 : Form
{
private System.Threading.Timer myTimer;
public Form1() {
this.InitializeComponent();
this.myTimer = new System.Threading.Timer(state =>
{
var i = 0;
var s = 100 / i;
}
, null, 5000, 5000);
}
}
}

Answer 2

The case might be because Unhandled Exceptions cause the application to terminate silently and UnhandledExceptionEventHandler handles non-UI thread exceptions.
See Application.SetUnhandledExceptionMode Method, AppDomain.UnhandledException Event and Application.ThreadException Event
EDIT:
Try setting Application.SetUnhandledExceptionMode as per first link:
Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException); //add this line
AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(CurrentDomain_UnhandledException);
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());