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  1. using System;
  2. using System.Threading;
  3.  
  4. namespace Recetas.Cap04
  5. {
  6. 	public class AsyncDemo
  7. 	{
  8. 		string LongRunningMethod (int iCallTime, out int iExecThread)
  9. 		{
  10. 			Thread.Sleep (iCallTime) ;
  11. 			iExecThread = AppDomain.GetCurrentThreadId ();
  12. 			return "MyCallTime was " + iCallTime.ToString() ;
  13. 		}
  14.  
  15. 		delegate string MethodDelegate(int iCallTime, out int iExecThread)  ;
  16.  
  17. 		public void DemoCallback()
  18. 		{
  19. 			MethodDelegate dlgt = new MethodDelegate (this.LongRunningMethod) ;
  20. 			string s ;
  21. 			int iExecThread;
  22.  
  23. 			// Create the callback delegate.
  24. 			AsyncCallback cb = new AsyncCallback(MyAsyncCallback);
  25.  
  26. 			// Initiate the Asynchronous call passing in the callback delegate
  27. 			// and the delegate object used to initiate the call.
  28. 			IAsyncResult ar = dlgt.BeginInvoke(3000, out iExecThread, cb, dlgt); 
  29. 		}
  30.  
  31. 		public void MyAsyncCallback(IAsyncResult ar)
  32. 		{
  33. 			string s ;
  34. 			int iExecThread ;
  35.  
  36. 			// Because you passed your original delegate in the asyncState parameter
  37. 			// of the Begin call, you can get it back here to complete the call.
  38. 			MethodDelegate dlgt = (MethodDelegate) ar.AsyncState;
  39.  
  40. 			// Complete the call.
  41. 			s = dlgt.EndInvoke (out iExecThread, ar) ;
  42.  
  43. 			Console.WriteLine (string.Format ("The delegate call returned the string: \"{0}\", and the number {1}", s, iExecThread.ToString() ) );
  44. 		}
  45.  
  46. 		static void Main(string[] args)
  47. 		{
  48. 			AsyncDemo ad = new AsyncDemo () ;
  49. 			ad.DemoCallback() ;
  50. 		}
  51. 	}
  52. }
Success #stdin #stdout 0.01s 34744KB
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https://ideone.com/V8b2NY
Callback pattern demonstration.
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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