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WaitHandle DoInvoke(MathFunctionToCall mathFunc, double value) { AsyncCallTracker callTracker = new AsyncCallTracker(mathFunc); AsyncCallback cb = new AsyncCallback(MathCallback); IAsyncResult asyncResult = mathFunc.BeginInvoke(value, cb, callTracker); return(callTracker.DoneEvent); } public void CallMathCallback(MathFunctionToCall mathFunc) { WaitHandle[] waitArray = new WaitHandle[4]; Console.WriteLine("Begin Invoke"); waitArray[0] = DoInvoke(mathFunc, 0.1); waitArray[1] = DoInvoke(mathFunc, 0.5); waitArray[2] = DoInvoke(mathFunc, 1.0); waitArray[3] = DoInvoke(mathFunc, 3.14159); Console.WriteLine("Begin Invoke Done"); Console.WriteLine("Waiting for completion"); WaitHandle.WaitAll(waitArray, 10000, false); Console.WriteLine("Completion achieved"); } } public class Test { public static double DoCalculation(double value) { Console.WriteLine("DoCalculation: {0}", value); Thread.Sleep(250); return(Math.Cos(value)); } public static void Main() { AsyncCaller ac = new AsyncCaller(); ac.CallMathCallback(new AsyncCaller.MathFunctionToCall(DoCalculation)); } } It s now necessary to pass both the delegate and an associated AutoResetEvent to the callback function, so these are encapsulated in the AsyncCallTracker class. The AutoResetEvent is returned from DoInvoke(), and this event isn t set until the last line of the callback, so there are no longer any race conditions. asp.net code 128 reader C# Code 128 Reader SDK to read, scan Code 128 in C#.NET class ...
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