System.Threading.Timer TimerCallback delegate with parameters?

Question

I need to pass the following int dldnow to sendData static method / delegate.

public int dldnow; Timer timer = new Timer(new TimerCallback(sendData), null, 1000*30, 1000*30); public static void sendData(object obj) { string imageCount = (string)dldnow; string imageCountJson = wc.DownloadString("http://*********/u.php?count=" + imageCount); }

As stated in the answer, simply put in dldnow as the parameter state (where you write null now). Another thing: You don't have to write new TimerCallback(sendData) in full. Since C# 2 you can just write sendData (this is called method group conversion). — Jeppe Stig Nielsen
– Jeppe Stig Nielsen, Commented Apr 10, 2013 at 16:19
Right version with parameter refreshing stackoverflow.com/questions/15931850/… — Crazywako
– Crazywako, Commented Apr 10, 2013 at 17:04

alex · Accepted Answer · 2013-04-10 15:44:38Z

If you want to pass it once, use a second constructor parameter:

System.Threading.Timer(new TimerCallback(sendData), dldnow, 1000*30, 1000*30);

If you want to access it regularly, you can make a static volatile field:

public static volatile int dldnow;

(volatile is need so that it would be always up to date when accessed from multiple threads)

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