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/ Computer Shopper 235 / Issue 235 - September 2007 - DPCS0907DVD.ISO / Microsoft / Expression Blend / Blend.en.msi / Sparkle.GPiano.DelayedCallback.cs.en < prev    next >
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Text File  |  2007-03-19  |  1.8 KB  |  34 lines
  1.  ■using System;
  3. using System.Threading;
  5. using System.Windows;
  7. using System.Windows.Threading;
  11. namespace GrandPiano
  13. {
  15.     /// <summary>
  17.     /// Solves the problem of scope when using Timer(), since it runs on a separated thread.
  19.     /// </summary>
  21.     public static class DelayedCallback
  23.     {
  25.         public delegate void Callback();
  29.         public static void Invoke(TimeSpan delay, Callback callback)
  31.         {
  33.             new Timer(DelayedCallback.HandleTimeout, callback, delay, TimeSpan.FromMilliseconds(-1));
  35.         }
  39.         private static void HandleTimeout(object state)
  41.         {
  43.             if (Application.Current != null)
  45.             {
  47.                 Application.Current.Dispatcher.BeginInvoke(DispatcherPriority.Normal, new DispatcherOperationCallback(
  49.                         delegate(object arg)
  51.                         {
  53.                             ((Callback)state)();
  55.                             return null;
  57.                         }), null);
  59.             }
  61.         }
  63.     }
  65. }