迭代列表时的.NET 5性能问题

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };

        // 使用foreach循环
        foreach (int number in numbers)
        {
            Console.WriteLine(number);
        }
    }
}

using System;
using System.Collections.Generic;
using System.Threading.Tasks;

public class Example
{
    public static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };

        // 使用Parallel.ForEach进行并行迭代
        Parallel.ForEach(numbers, number =>
        {
            Console.WriteLine(number);
        });
    }
}

using System;
using System.Collections.Generic;

public class Example
{
    public static void Main()
    {
        List<int> numbers = new List<int> { 1, 2, 3, 4, 5 };

        // 预先分配足够的空间
        numbers.Capacity = 1000000;
        for (int i = 0; i < 1000000; i++)
        {
            numbers.Add(i);
        }

        foreach (int number in numbers)
        {
            Console.WriteLine(number);
        }
    }
}