附: 異步委派程序設計范例 下列程序代碼示范 .Net 異步程序設計的用法，使用簡單類別將一些數字因子分解。 [C#] using System; using System.Threading; using System.Runtime.Remoting; using System.Runtime.Remoting.Messaging;
// Create an asynchronous delegate. public delegate bool FactorizingAsyncDelegate ( int factorizableNum, ref int primefactor1, ref int primefactor2);
// Create a class that factorizers the number. public class PrimeFactorizer { public bool Factorize( int factorizableNum, ref int primefactor1, ref int primefactor2) { primefactor1 = 1; primefactor2 = factorizableNum;
// Factorize using a low-tech approach. for (int i=2;i<factorizableNum;i++) { if (0 == (factorizableNum % i)) { primefactor1 = i; primefactor2 = factorizableNum / i; break; } }
// Class that receives a callback when the results are available. public class ProcessFactorizedNumber { private int _ulNumber;
public ProcessFactorizedNumber(int number) { _ulNumber = number; }
// Note that the qualifIEr is one-way. [OneWayAttribute()] public void FactorizedResults(IAsyncResult ar) { int factor1=0, factor2=0;
// Extract the delegate from the AsyncResult. FactorizingAsyncDelegate fd = (FactorizingAsyncDelegate)((AsyncResult)ar).AsyncDelegate;
// Obtain the result. fd.EndInvoke(ref factor1, ref factor2, ar);
// Output the results. Console.WriteLine("On CallBack: Factors of {0} : {1} {2}", _ulNumber, factor1, factor2); } }
// Class that shows variations of using Asynchronous public class Simple { // The following demonstrates the Asynchronous Pattern using a callback. public void FactorizeNumber1() { // The following is the clIEnt code. PrimeFactorizer pf = new PrimeFactorizer(); FactorizingAsyncDelegate fd = new FactorizingAsyncDelegate (pf.Factorize);
int factorizableNum = 1000589023, temp=0;
// Create an instance of the class that is going // to be called when the call completes. ProcessFactorizedNumber fc = new ProcessFactorizedNumber(factorizableNum);
// Define the AsyncCallback delegate. AsyncCallback cb = new AsyncCallback(fc.FactorizedResults);
// You can use any object as the state object. Object state = new Object();
// Asynchronously invoke the Factorize method on pf. IAsyncResult ar = fd.BeginInvoke( factorizableNum, ref temp, ref temp, cb, state);
// // Do some other useful work. //. . . }
// The following demonstrates the Asynchronous Pattern using a BeginInvoke, followed by waiting with a time-out. public void FactorizeNumber2() { // The following is the clIEnt code. PrimeFactorizer pf = new PrimeFactorizer(); FactorizingAsyncDelegate fd = new FactorizingAsyncDelegate (pf.Factorize);
int factorizableNum = 1000589023, temp=0;
// Create an instance of the class that is going // to be called when the call completes. ProcessFactorizedNumber fc = new ProcessFactorizedNumber(factorizableNum);
// Define the AsyncCallback delegate. AsyncCallback cb = new AsyncCallback(fc.FactorizedResults);
// You can use any object as the state object. Object state = new Object();
// Asynchronously invoke the Factorize method on pf. IAsyncResult ar = fd.BeginInvoke( factorizableNum, ref temp, ref temp, null, null);
ar.AsyncWaitHandle.WaitOne(10000, false);
if (ar.IsCompleted) { int factor1=0, factor2=0;
// Obtain the result. fd.EndInvoke(ref factor1, ref factor2, ar);
