Capture console exit C#

Question

I have a console application that contains quite a lot of threads. There are threads that monitor certain conditions and terminate the program if they are true. This termi

Answer 1

The link mentioned above by Charle B in comment to flq

Deep down says:

SetConsoleCtrlHandler won't work on windows7 if you link to user32

Some where else in the thread it is suggested to crate a hidden window. So I create a winform and in onload I attached to console and execute original Main. And then SetConsoleCtrlHandle works fine (SetConsoleCtrlHandle is called as suggested by flq)

public partial class App3DummyForm : Form
{
    private readonly string[] _args;

    public App3DummyForm(string[] args)
    {
        _args = args;
        InitializeComponent();
    }

    private void App3DummyForm_Load(object sender, EventArgs e)
    {
        AllocConsole();
        App3.Program.OriginalMain(_args);
    }

    [DllImport("kernel32.dll", SetLastError = true)]
    [return: MarshalAs(UnmanagedType.Bool)]
    static extern bool AllocConsole();
}

Answer 2

It sounds like you have the threads directly terminating the application? Perhaps it would be better to have a thread signal the main thread to say that the application should be terminated.

On receiving this signal, the main thread can cleanly shutdown the other threads and finally close itself down.

Answer 3

There is for WinForms apps;

Application.ApplicationExit += CleanupBeforeExit;

For Console apps, try

AppDomain.CurrentDomain.DomainUnload += CleanupBeforeExit;

But I am not sure at what point that gets called or if it will work from within the current domain. I suspect not.

Answer 4

For those interested in VB.net. (I searched the internet and couldn't find an equivalent for it) Here it is translated into vb.net.

    <DllImport("kernel32")> _
    Private Function SetConsoleCtrlHandler(ByVal HandlerRoutine As HandlerDelegate, ByVal Add As Boolean) As Boolean
    End Function
    Private _handler As HandlerDelegate
    Private Delegate Function HandlerDelegate(ByVal dwControlType As ControlEventType) As Boolean
    Private Function ControlHandler(ByVal controlEvent As ControlEventType) As Boolean
        Select Case controlEvent
            Case ControlEventType.CtrlCEvent, ControlEventType.CtrlCloseEvent
                Console.WriteLine("Closing...")
                Return True
            Case ControlEventType.CtrlLogoffEvent, ControlEventType.CtrlBreakEvent, ControlEventType.CtrlShutdownEvent
                Console.WriteLine("Shutdown Detected")
                Return False
        End Select
    End Function
    Sub Main()
        Try
            _handler = New HandlerDelegate(AddressOf ControlHandler)
            SetConsoleCtrlHandler(_handler, True)
     .....
End Sub