NET Console Application Exit Event

Question

In  NET  is there a method  such as an event  for detecting when a Console Application is exiting  I need to clean up some threads and COM objects   I am running a message loop  without a form  from the console application   A DCOM component that I am using seems to require that the application pump messages   I have tried adding a handler to Process GetCurrentProcess Exited and Process GetCurrentProcess Disposed   I have also tried adding a handler to Application ApplicationExit and Application ThreadExit events  but they are not firing   Perhaps that is because I am not using a form

User · Answer

For the CTRL C case  you can use this      Tell the system console to handle CTRL C by calling our method that    gracefully shuts down  Console CancelKeyPress    new ConsoleCancelEventHandler Console CancelKeyPress     static void Console CancelKeyPress object sender  ConsoleCancelEventArgs e                Console WriteLine  Shutting down                      Cleanup here             System Threading Thread Sleep 750

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You can use the ProcessExit event of the AppDomain   class Program       static void Main string   args                AppDomain CurrentDomain ProcessExit    new EventHandler CurrentDomain ProcessExit                         do some work             static void CurrentDomain ProcessExit object sender  EventArgs e                Console WriteLine  exit              Update  Here is a full example program with an empty  message pump  running on a separate thread  that allows the user to input a quit command in the console to close down the application gracefully  After the loop in MessagePump you will probably want to clean up resources used by the thread in a nice manner  It s better to do that there than in ProcessExit for several reasons    Avoid cross-threading problems  if external COM objects were created on the MessagePump thread  it s easier to deal with them there  There is a time limit on ProcessExit  3 seconds by default   so if cleaning up is time consuming  it may fail if pefromed within that event handler    Here is the code   class Program       private static bool  quitRequested   false      private static object  syncLock   new object        private static AutoResetEvent  waitHandle   new AutoResetEvent false        static void Main string   args                AppDomain CurrentDomain ProcessExit    new EventHandler CurrentDomain ProcessExit              start the message pumping thread         Thread msgThread   new Thread MessagePump           msgThread Start               read input to detect  quit  command         string command   string Empty          do                       command   Console ReadLine              while   command Equals  quit   StringComparison InvariantCultureIgnoreCase               signal that we want to quit         SetQuitRequested               wait until the message pump says it s done          waitHandle WaitOne               perform any additional cleanup  logging or whatever            private static void SetQuitRequested                 lock   syncLock                         quitRequested   true                       private static void MessagePump                 do                          act on messages           while    quitRequested            waitHandle Set               static void CurrentDomain ProcessExit object sender  EventArgs e                Console WriteLine  exit

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As a good example may be worth it to navigate to this project and see how to handle exiting processes grammatically or in this snippet from VM found in here                  ConsoleOutputStream   new ObservableCollection lt string gt                      var startInfo   new ProcessStartInfo FilePath                                        WorkingDirectory   RootFolderPath                      Arguments   StartingArguments                      RedirectStandardOutput   true                      UseShellExecute   false                      CreateNoWindow   true                                    ConsoleProcess   new Process  StartInfo   startInfo                    ConsoleProcess EnableRaisingEvents   true                   ConsoleProcess OutputDataReceived     sender  args    gt                                        App Current Dispatcher Invoke  System Action  delegate                                               ConsoleOutputStream Insert 0  args Data                             ConsoleOutputStream Add args Data                                                              ConsoleProcess Exited     sender  args    gt                                        InProgress   false                                      ConsoleProcess Start                    ConsoleProcess BeginOutputReadLine                         private void RegisterProcessWatcher                 startWatch   new ManagementEventWatcher              new WqlEventQuery   SELECT   FROM Win32 ProcessStartTrace where ProcessName     FileName               startWatch EventArrived    new EventArrivedEventHandler startProcessWatch EventArrived            stopWatch   new ManagementEventWatcher              new WqlEventQuery   SELECT   FROM Win32 ProcessStopTrace where ProcessName     FileName               stopWatch EventArrived    new EventArrivedEventHandler stopProcessWatch EventArrived              private void stopProcessWatch EventArrived object sender  EventArrivedEventArgs e                InProgress   false             private void startProcessWatch EventArrived object sender  EventArrivedEventArgs e                InProgress   true

User · Answer

If you are using a console application and you are pumping messages  can t you use the WM QUIT message

User · Answer

Here is a complete  very simple  Net solution that works in all versions of windows  Simply paste it into a new project  run it and try CTRL-C to view how it handles it   using System  using System Collections Generic  using System Linq  using System Runtime InteropServices  using System Text  using System Threading   namespace TestTrapCtrlC      public class Program          static bool exitSystem   false            region Trap application termination          DllImport  Kernel32            private static extern bool SetConsoleCtrlHandler EventHandler handler  bool add            private delegate bool EventHandler CtrlType sig           static EventHandler  handler           enum CtrlType            CTRL C EVENT   0           CTRL BREAK EVENT   1           CTRL CLOSE EVENT   2           CTRL LOGOFF EVENT   5           CTRL SHUTDOWN EVENT   6                     private static bool Handler CtrlType sig                Console WriteLine  Exiting system due to external CTRL-C  or process kill  or shutdown                   do your cleanup here             Thread Sleep 5000     simulate some cleanup delay              Console WriteLine  Cleanup complete                   allow main to run off              exitSystem   true                 shutdown right away so there are no lingering threads             Environment Exit -1                return true                     endregion          static void Main string   args                   Some biolerplate to react to close window event  CTRL-C  kill  etc              handler    new EventHandler Handler               SetConsoleCtrlHandler  handler  true                  start your multi threaded program here             Program p   new Program                p Start                   hold the console so it doesn   t run off the end             while  exitSystem                    Thread Sleep 500                                    public void Start                    start a thread and start doing some processing             Console WriteLine  Thread started  processing

User · Answer

The application is a server which simply runs until the system shuts down or it receives a Ctrl C or the console window is closed   Due to the extraordinary nature of the application  it is not feasible to  gracefully  exit    It may be that I could code another application which would send a  server shutdown  message but that would be overkill for one application and still insufficient for certain circumstances like when the server  Actual OS  is actually shutting down    Because of these circumstances I added a  ConsoleCtrlHandler  where I stop my threads and clean up my COM objects etc      Public Declare Auto Function SetConsoleCtrlHandler Lib  kernel32 dll   ByVal Handler As HandlerRoutine  ByVal Add As Boolean  As Boolean  Public Delegate Function HandlerRoutine ByVal CtrlType As CtrlTypes  As Boolean  Public Enum CtrlTypes   CTRL C EVENT   0   CTRL BREAK EVENT   CTRL CLOSE EVENT   CTRL LOGOFF EVENT   5   CTRL SHUTDOWN EVENT End Enum  Public Function ControlHandler ByVal ctrlType As CtrlTypes  As Boolean    clean up code here   End Function  Public Sub Main         SetConsoleCtrlHandler New HandlerRoutine AddressOf ControlHandler   True      End Sub   This setup seems to work out perfectly   Here is a link to some C  code for the same thing

[.net] .NET Console Application Exit Event

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