Here is my attempt to solve this problem. Task Manager can still close the application though. But, my thought was to try and detect when it is being closed and then relaunch it. However, I didn't implement that part.
The following program will detect a CTRL-C && CTRL-BREAK and will keep on going.
EDIT: Removed the "X" Button
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Diagnostics;
namespace DoNotCloseMe
{
class Program
{
const string _title = "DO NOT CLOSE - Important Program";
static void Main(string[] args)
{
Console.Title = _title;
IntPtr hMenu = Process.GetCurrentProcess().MainWindowHandle;
IntPtr hSystemMenu = GetSystemMenu(hMenu, false);
EnableMenuItem(hSystemMenu, SC_CLOSE, MF_GRAYED);
RemoveMenu(hSystemMenu, SC_CLOSE, MF_BYCOMMAND);
WriteConsoleHeader();
//This function only seems to be called once.
//After calling MainLoop() below, CTRL-C && CTRL-BREAK cause Console.ReadLine() to return NULL
Console.CancelKeyPress += (sender, e) =>
{
Console.WriteLine("Clean-up code invoked in CancelKeyPress handler.");
Console.WriteLine("Key Pressed: {0}", e.SpecialKey.ToString());
System.Threading.Thread.Sleep(1000);
MainLoop();
// The application terminates directly after executing this delegate.
};
MainLoop();
}
private static void MainLoop()
{
while (true)
{
WriteConsoleHeader();
string x = Console.ReadLine();
if (!String.IsNullOrEmpty(x))
{
switch (x.ToUpperInvariant())
{
case "EXIT":
case "QUIT":
System.Environment.Exit(0);
break;
default:
StartLongRunningTaskOnSeparateThread(x);
break;
}
}
}
}
private static void StartLongRunningTaskOnSeparateThread(string command)
{
var bg = new System.ComponentModel.BackgroundWorker();
bg.WorkerReportsProgress = false;
bg.WorkerSupportsCancellation = false;
bg.DoWork += (sender, args) =>
{
var sleepTime = (new Random()).Next(5000);
System.Threading.Thread.Sleep(sleepTime);
};
bg.RunWorkerCompleted += (sender, args) =>
{
Console.WriteLine("Commmand Complete: {0}", command);
};
bg.RunWorkerAsync();
}
private static void WriteConsoleHeader()
{
Console.Clear();
Console.WriteLine(new string('*', Console.WindowWidth - 1));
Console.WriteLine(_title);
Console.WriteLine(new string('*', Console.WindowWidth - 1));
Console.WriteLine("Please do not close this program.");
Console.WriteLine("It is maintaining the space/time continuum.");
Console.WriteLine("If you close it, Q will not be happy and you will be assimilated.");
Console.WriteLine(new string('*', Console.WindowWidth - 1));
Console.WriteLine("Development Mode: Use \"EXIT\" or \"QUIT\" to exit application.");
Console.WriteLine(new string('*', Console.WindowWidth - 1));
}
#region "Unmanaged"
[DllImport("user32.dll")]
static extern bool EnableMenuItem(IntPtr hMenu, uint uIDEnableItem, uint uEnable);
[DllImport("user32.dll")]
static extern IntPtr GetSystemMenu(IntPtr hWnd, bool bRevert);
[DllImport("user32.dll")]
static extern IntPtr RemoveMenu(IntPtr hMenu, uint nPosition, uint wFlags);
internal const uint SC_CLOSE = 0xF060;
internal const uint MF_GRAYED = 0x00000001;
internal const uint MF_BYCOMMAND = 0x00000000;
#endregion
}
}