RubyのTimesをC#の拡張メソッドで実装してみた ref: https://qiita.com/takaaki-iwamoto/items/7f59f9768d1e757e74a7

file0.rb

3.times{|i|
  p i
}
# out =>
# 0
# 1
# 2

file1.txt

using System;
using System.Linq;

public class Program{
    public static void Main(){
        Enumerable.Range(0,3).ToList().ForEach(i =>
            Console.WriteLine(i)
        );
    }
}

file2.txt

using System;

public class Program{
    public static void Main(){
        // Enumerable.Range(0,3).ToList().ForEach(i =>
        for(var i = 0; i < 3; ++i){
            Console.WriteLine(i);
        };
    }
}

file3.txt

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

public class Program{
    public static void Main(){
        3.Times(i => 
            Console.Write(i)
        ); 
    }
}

file4.rb

1.upto(3).each{|i|
    p i
}
# out =>
# 1
# 2
# 3

file5.txt

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

public class Program{
    public static void Main(){
        1.To(3).ToList().ForEach(i => 
            Console.Write(i)
        ); 
    }
}
// out =>
// 1
// 2
// 3

file6.txt

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

public class Program{
    public static void Main(){
        foreach(var i in 1.To(3)) {
            Console.Write(i);
        }; 
    }
}

file7.txt

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

public static class Extension{
    public static IEnumerable<int> To(this int from, int to){
        return Enumerable.Range(from, to - from + 1);
    }
}

file8.txt

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

public class Program{
    public static void Main(){
        1.To(3).ToList().ForEach(i => 
            Console.Write(i)
        ); 
    }
}

public static class Extension{
    public static IEnumerable<int> To(this int from, int to){
        return Enumerable.Range(from, to - from + 1);
    }
}

file9.txt

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

public class Program{
    public static void Main(){
        3.Times(i => 
            Console.Write(i)
        ); 
    }
}

public static class Extension{
    public static IEnumerable<int> To(this int from, int to){
        return Enumerable.Range(from, to - from + 1);
    }

    // albireoさんの提案のコード追記
    public static void ForEach<T>(this IEnumerable<T> source, Action<T> action){
        source.All(x => {action(x); return true;});
    }

    public static void Times(this int times, Action<int> action){
        // 0.To(times - 1).ToList().ForEach(x => action(x));
        0.To(times - 1).ForEach(x => action(x));
    }
}