using System;
using System.Collections.Generic;
 
static class Program
{
    static void Main(string[] args)
    {
        var array = new[] { "hoge", "huga", "tako" };
        array.ForEach((s, i) => Console.WriteLine(i + ":" + s));
    }
}
 
static class Extensions
{
    public static void ForEach<T>(this IEnumerable<T> source, Action<T, int> action)
    {
        int i = 0;
        foreach (var item in source)
        {
            action(item, i++);
        }
    }
}
 
 

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