Prevent Winform to crash on unhandled exception

Question

I'm trying to catch unhandled exception this way :

static class Program
{
        [STAThread]
        static void Main(string[] args)
        {
            Application.ThreadException += new ThreadExceptionEventHandler(Program.ThreadExceptionEventHandler);
            Application.SetUnhandledExceptionMode(UnhandledExceptionMode.CatchException);
            AppDomain.CurrentDomain.UnhandledException += new UnhandledExceptionEventHandler(Program.UnhandledExceptionEvent);

            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }

        public static void UnhandledExceptionEvent(Object sender, UnhandledExceptionEventArgs e)
        {
            MessageBox.Show("UnhandledExceptionEvent", "UnhandledExceptionEvent");
        }

        public static void ThreadExceptionEventHandler(Object sender, ThreadExceptionEventArgs e)
        {
            MessageBox.Show(e.Exception.Message, "ThreadExceptionEventHandler");
        }
}

private void button1_Click(object sender, EventArgs e)
        {
            //Execute method on a new thread
            new Thread(delegate()
            {
                //Do stuff ...
                throw new Exception("Some random unhandled exception");

            }).Start();

        }

The exception is caught by the UnhandledExceptionEventHandler, I can see the message box popping, but the application still crashes saying "Program has stopped working".

How do I keep the application runnning after an exceptions occurs ?

Normally you would surround your code block with a try - catch block.The exception would be specific to what might occur and if you're not sure just use the Exception class. — Mukus, Mar 09 '14 at 23:34
I believe the "stopped working" message has something to do with another error. — Mauren, Mar 09 '14 at 23:35
@Tejaswi Rana If I surround with a try-catch block then it isn't an unhadled exception anymore, it's handled, which obviously won't crash the application, but it's not my question. — KVM, Mar 09 '14 at 23:39
@Xenolightning There is no such property, please see youself : http://msdn.microsoft.com/en-us/library/system.unhandledexceptioneventargs(v=vs.110).aspx — KVM, Mar 09 '14 at 23:45
@Mauren I did a new project with just the code above, nothing else — KVM, Mar 09 '14 at 23:47
@Michael Look at the last answer here: http://stackoverflow.com/questions/5049063/unhandled-exception-in-winforms-application?rq=1 — Mukus, Mar 09 '14 at 23:51
@Michael isn't there a case where `ThreadExceptionEventHandler` will receive a `null` `ThreadExceptionEventArgs`? — Mauren, Mar 09 '14 at 23:52
@Tejaswi Rana the first answer actually solves my issue. Please post this as an answer, I will mark it as the solution. — KVM, Mar 10 '14 at 00:05
@Mauren ThreadExceptionEventHandler is not firing in this example — KVM, Mar 10 '14 at 00:09
Why not just fix the problem that is causing the unhandled exception? — John Saunders, Mar 10 '14 at 00:10
@Michael I don't think I should take credit for someone else's answer.. and that too on stackoverflow. — Mukus, Mar 10 '14 at 00:23
@Tejaswi Rana You are not stealing anyone's anwser, you are just answering another question. I think giving an answer in the comment section is a Stack Overflow "bad practice" — KVM, Mar 10 '14 at 00:27

score 2 · Accepted Answer · edited May 23 '17 at 12:28

2

Please see this stackoverflow question for information related to catching unhandled excpetions.

edited May 23 '17 at 12:28

Community

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answered Mar 10 '14 at 01:37

Mukus

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Prevent Winform to crash on unhandled exception

1 Answers1