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Posted 31 Dec 2010
Licenced CPOL

Track Object Finalization

, 5 Jan 2011
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Make sure your objects are garbage collected

Sometimes, it's useful to detect when an object is garbage collected.

Garbage collection happens in a separate thread, and if you want to display some information about this, in a Windows Forms GUI, you need to use BeginInvoke and not Invoke or your application will "freeze".

Invoke will not be executed during garbage collection.

  private static long objectsDestroyedCounter = 0;
  ~Entity( )
    if( (objectsDestroyedCounter % 10000) == 0)
      LogDebug(string.Format("{0} objects dropped.",objectsDestroyedCounter) );

  private static void LogDebug(string s)


Execution of the code actually displaying the information is deferred until after the garbage collector has finished.

class MainForm : Form
  private static MainForm instance;
  public MainForm()
    instance = this;

  public static MainForm Instance
      return instance; 

  public static void LogString(string s)
    MainForm mainForm = Instance;
    if( mainForm != null )

delegate void Instance_MessageLoggedDelegate(object sender, string message);

  void Instance_MessageLogged(object sender, string message)
      if (InvokeRequired)
        BeginInvoke(new Instance_MessageLoggedDelegate (Instance_MessageLogged), 
                    new object[] { sender, message });
        // Executed on the GUI thread after GC has completed

I hope that it might be useful.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Espen Harlinn
Architect Powel AS
Norway Norway
Chief Architect - Powel AS.

Specializing in integrated operations and high performance computing solutions.

I’ve been fooling around with computers since the early eighties, I’ve even done work on CP/M and MP/M.

Wrote my first “real” program on a BBC micro model B based on a series in a magazine at that time. It was fun and I got hooked on this thing called programming ...

A few Highlights:

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Comments and Discussions

GeneralReason for my vote of 5 Nice tip Pin
BillW334-Jan-11 6:18
professionalBillW334-Jan-11 6:18 
GeneralReason for my vote of 5 Thanks for sharing this tip. Pin
linuxjr1-Jan-11 14:19
professionallinuxjr1-Jan-11 14:19 
GeneralThanks Pin
Espen Harlinn1-Jan-11 0:41
mentorEspen Harlinn1-Jan-11 0:41 
GeneralReason for my vote of 5 Good Pin
Shahin Khorshidnia31-Dec-10 16:30
professionalShahin Khorshidnia31-Dec-10 16:30 
GeneralCarefull when you do this... Pin
msmits10-Jan-11 1:52
membermsmits10-Jan-11 1:52 
GeneralRe: Carefull when you do this... Pin
Espen Harlinn10-Jan-11 2:27
mentorEspen Harlinn10-Jan-11 2:27 
GeneralRe: Carefull when you do this... Pin
msmits10-Jan-11 3:01
membermsmits10-Jan-11 3:01 
GeneralRe: Carefull when you do this... Pin
Espen Harlinn10-Jan-11 3:35
mentorEspen Harlinn10-Jan-11 3:35 
GeneralRe: Carefull when you do this... Pin
msmits10-Jan-11 3:43
membermsmits10-Jan-11 3:43 
GeneralRe: Carefull when you do this... Pin
Espen Harlinn10-Jan-11 3:52
mentorEspen Harlinn10-Jan-11 3:52 

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