System.Threading.Timer具有参数的TimerCallback委托？

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);
}

Answer 1

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)