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POHow to make a series of asynchronous calls and then use the value returned by first thread?
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copied!<p>I want to make asynchronous calls and then process the value returned by first thread. <strong>I don't want to use Parallel library.</strong> I can just use .Net 2.0. I have written the following program which should suffice my requirements. But can someone please point out if there is a better solution? Thanks.</p> <p>Here is my code:</p> <pre><code>class Program { private static Worker _worker2; private static Worker _worker3; private static Worker _worker4; private static Worker _worker1; delegate void DoWorkDelegate(object param); private static Worker _firstReturnedWorker = null; private static object lockObject = new object(); public static void Main() { _worker1 = new Worker(); _worker2 = new Worker(); _worker3 = new Worker(); _worker4 = new Worker(); int i = 10; DoWorkDelegate d1 = new DoWorkDelegate(_worker1.OnDoWork); d1.BeginInvoke(1, OnThreadReturned, ++i); DoWorkDelegate d2 = new DoWorkDelegate(_worker2.OnDoWork); d2.BeginInvoke(2, OnThreadReturned, ++i); DoWorkDelegate d3 = new DoWorkDelegate(_worker3.OnDoWork); d3.BeginInvoke(3, OnThreadReturned, ++i); DoWorkDelegate d4 = new DoWorkDelegate(_worker4.OnDoWork); d4.BeginInvoke(4, OnThreadReturned, ++i); Console.ReadKey(); } private static void OnThreadReturned(IAsyncResult ar) { lock (lockObject) { if (_firstReturnedWorker == null) { var workerIdentifier = (int)ar.AsyncState; switch (workerIdentifier) { case 11: _firstReturnedWorker = _worker1; break; case 12: _firstReturnedWorker = _worker2; break; case 13: _firstReturnedWorker = _worker3; break; case 14: _firstReturnedWorker = _worker4; break; } } else { return; } } Console.WriteLine("First result received was {0}", _firstReturnedWorker.ReturnedValue); } } public class Worker { public string ReturnedValue { get; private set; } public void OnDoWork(object value) { ReturnedValue = Process((int)value); } private string Process(int numberToProcess) { return string.Format("{0} was processed by {1}", numberToProcess, Thread.CurrentThread.ManagedThreadId); } } </code></pre>

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