AppDomain.CurrentDomain.UnhandledException not firing without debugging

Question

I have a .NET program with an event handler bound to Application.CurrentDomain.UnhandledException. When running the program with debugging, this event fires when an unhandle

Answer 1

Maybe the exception is thrown within a separate thread in your application. We've seen the problem of an application just "stopping" (means: one second it's there, the other second it's gone) when an unhandled exception occurs within a thread. In that case, not even the unhandled exception handler got triggered.

Answer 2

I assume you have not set the correct exception handling mode using Application.SetUnhandledExceptionMode() - just set it to UnhandledExceptionMode.ThrowException.

UPDATE

I just wrote a small test application and found nothing to work unexscpected. Could you try to reproduce your error with this test code?

using System;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;

namespace ConsoleApplication
{
    public static class Program
    {
        static void Main()
        {
            AppDomain.CurrentDomain.UnhandledException += AppDomain_UnhandledException;

            Application.ThreadException += Application_ThreadException;
            Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);

            Application.Run(new TestForm());

            throw new Exception("Main");
        }

        static void Application_ThreadException(Object sender, ThreadExceptionEventArgs e)
        {
            MessageBox.Show(e.Exception.Message, "Application.ThreadException");
        }

        static void AppDomain_UnhandledException(Object sender, UnhandledExceptionEventArgs e)
        {
            MessageBox.Show(((Exception)e.ExceptionObject).Message, "AppDomain.UnhandledException");
        }
    }

    public class TestForm : Form
    {
        public TestForm()
        {
            this.Text = "Test Application";
            this.ClientSize = new Size(200, 60);
            this.MinimumSize = this.Size;
            this.MaximumSize = this.Size;
            this.StartPosition = FormStartPosition.CenterScreen;

            Button btnThrowException = new Button();

            btnThrowException.Text = "Throw";
            btnThrowException.Location = new Point(0, 0);
            btnThrowException.Size = new Size(200, 30);
            btnThrowException.Click += (s, e) => { throw new Exception("Throw"); };

            Button btnThrowExceptionOnOtherThread = new Button();

            btnThrowExceptionOnOtherThread.Text = "Throw on other thread";
            btnThrowExceptionOnOtherThread.Location = new Point(0, 30);
            btnThrowExceptionOnOtherThread.Size = new Size(200, 30);
            btnThrowExceptionOnOtherThread.Click += (s, e) => new Thread(() => { throw new Exception("Other thread"); }).Start();

            this.Controls.Add(btnThrowException);
            this.Controls.Add(btnThrowExceptionOnOtherThread);
        }
    }
}