Parallel.ForEach 迴圈

如果你有一個你希望加速的 foreach 迴圈並且你不介意輸出的順序，你可以通過執行以下操作將其轉換為並行的 foreach 迴圈：

using System;
using System.Threading;
using System.Threading.Tasks;

public class MainClass {

    public static void Main() {
        int[] Numbers = new int[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
        // Single-threaded
        Console.WriteLine("Normal foreach loop: ");
        foreach (var number in Numbers) {
            Console.WriteLine(longCalculation(number));
        }
        // This is the Parallel (Multi-threaded solution)
        Console.WriteLine("Parallel foreach loop: ");
        Parallel.ForEach(Numbers, number => {
            Console.WriteLine(longCalculation(number));
        });
    }

    private static int longCalculation(int number) {
        Thread.Sleep(1000); // Sleep to simulate a long calculation
        return number * number;
    }
}