用于IEnumerable的C#实现的F#Seq模块？

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var numbers = new[] { 1, 2, 3, 4, 5 };

        var doubledNumbers = numbers.Select(x => x * 2);
        var evenNumbers = numbers.Where(x => x % 2 == 0);
        var sum = numbers.Aggregate((acc, x) => acc + x);

        Console.WriteLine("Doubled numbers: " + string.Join(", ", doubledNumbers));
        Console.WriteLine("Even numbers: " + string.Join(", ", evenNumbers));
        Console.WriteLine("Sum: " + sum);
    }
}

Doubled numbers: 2, 4, 6, 8, 10
Even numbers: 2, 4
Sum: 15