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Track object finalization

, 5 Jan 2011 CPOL
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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.
 
#if DEBUG
  private static long objectsDestroyedCounter = 0;
  ~Entity( )
  {
    objectsDestroyedCounter++;
    if( (objectsDestroyedCounter % 10000) == 0)
    {
      LogDebug(string.Format("{0} objects dropped.",objectsDestroyedCounter) );
    }
  }
 
  private static void LogDebug(string s)
  {
    MainForm.LogString(s);
  }
 
#endif
 
Exceution 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
  {
    get
    {
      return instance; 
    }
  }
 
  public static void LogString(string s)
  {
    MainForm mainForm = Instance;
    if( mainForm != null )
    {
      Instance_MessageLogged(mainForm,s);
    }
  }
 
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 });
      }
      else
      {
        // Excuted on the GUI thread after GC has completed
        messagesTextBox.AppendText(message);
      }
    }
}
 
In the hope that it might be useful,
Espen Harlinn

License

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

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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:
  • High performance application server development
  • Model Driven Architecture and Code generators
  • Real-Time Distributed Solutions
  • C, C++, C#, Java, TSQL, PL/SQL, Delphi, ActionScript, Perl, Rexx
  • Microsoft SQL Server, Oracle RDBMS, IBM DB2, PostGreSQL
  • AMQP, Apache qpid, RabbitMQ, Microsoft Message Queuing, IBM WebSphereMQ, Oracle TuxidoMQ
  • Oracle WebLogic, IBM WebSphere
  • Corba, COM, DCE, WCF
  • AspenTech InfoPlus.21(IP21), OsiSoft PI
 
More information about what I do for a living can be found at: harlinn.com or LinkedIn
 
You can contact me at espen.harlinn@powel.no

Comments and Discussions

 
GeneralReason for my vote of 5 Nice tip PinmemberCIDev4-Jan-11 7:18 
GeneralReason for my vote of 5 Thanks for sharing this tip. Pinmemberlinuxjr1-Jan-11 15:19 
GeneralThanks PinmvpEspen Harlinn1-Jan-11 1:41 
GeneralReason for my vote of 5 Good PinmemberShahin Khorshidnia31-Dec-10 17:30 
GeneralCarefull when you do this... Pinmembermsmits10-Jan-11 2:52 
GeneralRe: Carefull when you do this... PinmemberEspen Harlinn10-Jan-11 3:27 
GeneralRe: Carefull when you do this... Pinmembermsmits10-Jan-11 4:01 
GeneralRe: Carefull when you do this... PinmemberEspen Harlinn10-Jan-11 4:35 
GeneralRe: Carefull when you do this... Pinmembermsmits10-Jan-11 4:43 
GeneralRe: Carefull when you do this... PinmemberEspen Harlinn10-Jan-11 4:52 

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