一个并行程序

using System;using System.Collections.Generic;using System.Diagnostics;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks;namespace GetPrimes{    internal class ProcessDataInParallel    {        private static void Main(string[] args)        {            int maxPrimes = 1000000;            int maxNumber = 20000000;            long primesFound = 0;            Console.WriteLine("Iterative");            Stopwatch watch = new Stopwatch();            watch.Start();            for (UInt32 i = 0; i < maxNumber; ++i)            {                if (IsPrime(i))                {                    Interlocked.Increment(ref primesFound);                    if (primesFound > maxPrimes)                    {                        Console.WriteLine("Last prime found:{0:N0}", i);                        break;                    }                }            }            watch.Stop();            Console.WriteLine("Found {0:N0} primes in {1}", primesFound, watch.Elapsed);            watch.Reset();            primesFound = 0;            Console.WriteLine("Parallel");            watch.Start();            //in order to stop the loop, there is an            //overload that takes Action<int, ParallelLoopState>            Parallel.For(0, maxNumber, (i, loopState) =>            {                if (IsPrime((UInt32)i))                {                    Interlocked.Increment(ref primesFound);                    if (primesFound > maxPrimes)                    {                        Console.WriteLine("Last prime found:{0:N0}", i);                        loopState.Stop();                    }                }            });                        watch.Stop();            Console.WriteLine("Found {0:N0} primes in {1}", primesFound, watch.Elapsed);            Console.ReadKey();        }                public static bool IsPrime(UInt32 number)        {            //check for evenness            if (number % 2 == 0)            {                if (number == 2)                {                    return true;                }                return false;            }            //don’¡¥t need to check past the square root            UInt32 max = (UInt32)Math.Sqrt(number);            for (UInt32 i = 3; i <= max; i += 2)            {                if ((number % i) == 0)                {                    return false;                }            }            return true;        }    }}

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