All substrings, C#

All substrings

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            string text = "xfoofoobarbar fooxxfoo barxxxfoo";
            var allSubstrings = Enumerable.Range(2,text.Length)
                .ToDictionary(k => k,v => FindSubStrings(text,v));
            
            foreach(var item in allSubstrings)
            {
                Console.WriteLine(item.Key);
                foreach(var ss in item.Value)
                    Console.WriteLine("\t" + ss);
            }
        }
        
        private static IEnumerable<string> FindSubStrings(string input, int length)
        {
            for(var i=0;i<input.Length-length;i++)
            {
                yield return input.Substring(i,length);
            }
        }
                          
                          
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,16 sec, absolute running time: 0,13 sec, cpu time: 0,09 sec, average memory usage: 17 Mb, average nr of threads: 4

2 xf fo oo of fo oo ob ba ar rb ba ar r f fo oo ox xx xf fo oo o b ba ar rx xx xx xf fo 3 xfo foo oof ofo foo oob oba bar arb rba bar ar r f fo foo oox oxx xxf xfo foo oo o b ba bar arx rxx xxx xxf xfo 4 xfoo foof oofo ofoo foob ooba obar barb arba rbar bar ar f r fo foo foox ooxx oxxf xxfo xfoo foo oo b o ba bar barx arxx rxxx xxxf xxfo 5 xfoof foofo oofoo ofoob fooba oobar obarb barba arbar rbar bar f ar fo r foo foox fooxx ooxxf oxxfo xxfoo xfoo foo b oo ba o bar barx barxx arxxx rxxxf xxxfo 6 xfoofo foofoo oofoob ofooba foobar oobarb obarba barbar arbar rbar f bar fo ar foo r foox fooxx fooxxf ooxxfo oxxfoo xxfoo xfoo b foo ba oo bar o barx barxx barxxx arxxxf rxxxfo 7 xfoofoo foofoob oofooba ofoobar foobarb oobarba obarbar barbar arbar f rbar fo bar foo ar foox r fooxx fooxxf fooxxfo ooxxfoo oxxfoo xxfoo b xfoo ba foo bar oo barx o barxx barxxx barxxxf arxxxfo 8 xfoofoob foofooba oofoobar ofoobarb foobarba oobarbar obarbar barbar f arbar fo rbar foo bar foox ar fooxx r fooxxf fooxxfo fooxxfoo ooxxfoo oxxfoo b xxfoo ba xfoo bar foo barx oo barxx o barxxx barxxxf barxxxfo 9 xfoofooba foofoobar oofoobarb ofoobarba foobarbar oobarbar obarbar f barbar fo arbar foo rbar foox bar fooxx ar fooxxf r fooxxfo fooxxfoo fooxxfoo ooxxfoo b oxxfoo ba xxfoo bar xfoo barx foo barxx oo barxxx o barxxxf barxxxfo 10 xfoofoobar foofoobarb oofoobarba ofoobarbar foobarbar oobarbar f obarbar fo barbar foo arbar foox rbar fooxx bar fooxxf ar fooxxfo r fooxxfoo fooxxfoo fooxxfoo b ooxxfoo ba oxxfoo bar xxfoo barx xfoo barxx foo barxxx oo barxxxf o barxxxfo 11 xfoofoobarb foofoobarba oofoobarbar ofoobarbar foobarbar f oobarbar fo obarbar foo barbar foox arbar fooxx rbar fooxxf bar fooxxfo ar fooxxfoo r fooxxfoo fooxxfoo b fooxxfoo ba ooxxfoo bar oxxfoo barx xxfoo barxx xfoo barxxx foo barxxxf oo barxxxfo 12 xfoofoobarba foofoobarbar oofoobarbar ofoobarbar f foobarbar fo oobarbar foo obarbar foox barbar fooxx arbar fooxxf rbar fooxxfo bar fooxxfoo ar fooxxfoo r fooxxfoo b fooxxfoo ba fooxxfoo bar ooxxfoo barx oxxfoo barxx xxfoo barxxx xfoo barxxxf foo barxxxfo 13 xfoofoobarbar foofoobarbar oofoobarbar f ofoobarbar fo foobarbar foo oobarbar foox obarbar fooxx barbar fooxxf arbar fooxxfo rbar fooxxfoo bar fooxxfoo ar fooxxfoo b r fooxxfoo ba fooxxfoo bar fooxxfoo barx ooxxfoo barxx oxxfoo barxxx xxfoo barxxxf xfoo barxxxfo 14 xfoofoobarbar foofoobarbar f oofoobarbar fo ofoobarbar foo foobarbar foox oobarbar fooxx obarbar fooxxf barbar fooxxfo arbar fooxxfoo rbar fooxxfoo bar fooxxfoo b ar fooxxfoo ba r fooxxfoo bar fooxxfoo barx fooxxfoo barxx ooxxfoo barxxx oxxfoo barxxxf xxfoo barxxxfo 15 xfoofoobarbar f foofoobarbar fo oofoobarbar foo ofoobarbar foox foobarbar fooxx oobarbar fooxxf obarbar fooxxfo barbar fooxxfoo arbar fooxxfoo rbar fooxxfoo b bar fooxxfoo ba ar fooxxfoo bar r fooxxfoo barx fooxxfoo barxx fooxxfoo barxxx ooxxfoo barxxxf oxxfoo barxxxfo 16 xfoofoobarbar fo foofoobarbar foo oofoobarbar foox ofoobarbar fooxx foobarbar fooxxf oobarbar fooxxfo obarbar fooxxfoo barbar fooxxfoo arbar fooxxfoo b rbar fooxxfoo ba bar fooxxfoo bar ar fooxxfoo barx r fooxxfoo barxx fooxxfoo barxxx fooxxfoo barxxxf ooxxfoo barxxxfo 17 xfoofoobarbar foo foofoobarbar foox oofoobarbar fooxx ofoobarbar fooxxf foobarbar fooxxfo oobarbar fooxxfoo obarbar fooxxfoo barbar fooxxfoo b arbar fooxxfoo ba rbar fooxxfoo bar bar fooxxfoo barx ar fooxxfoo barxx r fooxxfoo barxxx fooxxfoo barxxxf fooxxfoo barxxxfo 18 xfoofoobarbar foox foofoobarbar fooxx oofoobarbar fooxxf ofoobarbar fooxxfo foobarbar fooxxfoo oobarbar fooxxfoo obarbar fooxxfoo b barbar fooxxfoo ba arbar fooxxfoo bar rbar fooxxfoo barx bar fooxxfoo barxx ar fooxxfoo barxxx r fooxxfoo barxxxf fooxxfoo barxxxfo 19 xfoofoobarbar fooxx foofoobarbar fooxxf oofoobarbar fooxxfo ofoobarbar fooxxfoo foobarbar fooxxfoo oobarbar fooxxfoo b obarbar fooxxfoo ba barbar fooxxfoo bar arbar fooxxfoo barx rbar fooxxfoo barxx bar fooxxfoo barxxx ar fooxxfoo barxxxf r fooxxfoo barxxxfo 20 xfoofoobarbar fooxxf foofoobarbar fooxxfo oofoobarbar fooxxfoo ofoobarbar fooxxfoo foobarbar fooxxfoo b oobarbar fooxxfoo ba obarbar fooxxfoo bar barbar fooxxfoo barx arbar fooxxfoo barxx rbar fooxxfoo barxxx bar fooxxfoo barxxxf ar fooxxfoo barxxxfo 21 xfoofoobarbar fooxxfo foofoobarbar fooxxfoo oofoobarbar fooxxfoo ofoobarbar fooxxfoo b foobarbar fooxxfoo ba oobarbar fooxxfoo bar obarbar fooxxfoo barx barbar fooxxfoo barxx arbar fooxxfoo barxxx rbar fooxxfoo barxxxf bar fooxxfoo barxxxfo 22 xfoofoobarbar fooxxfoo foofoobarbar fooxxfoo oofoobarbar fooxxfoo b ofoobarbar fooxxfoo ba foobarbar fooxxfoo bar oobarbar fooxxfoo barx obarbar fooxxfoo barxx barbar fooxxfoo barxxx arbar fooxxfoo barxxxf rbar fooxxfoo barxxxfo 23 xfoofoobarbar fooxxfoo foofoobarbar fooxxfoo b oofoobarbar fooxxfoo ba ofoobarbar fooxxfoo bar foobarbar fooxxfoo barx oobarbar fooxxfoo barxx obarbar fooxxfoo barxxx barbar fooxxfoo barxxxf arbar fooxxfoo barxxxfo 24 xfoofoobarbar fooxxfoo b foofoobarbar fooxxfoo ba oofoobarbar fooxxfoo bar ofoobarbar fooxxfoo barx foobarbar fooxxfoo barxx oobarbar fooxxfoo barxxx obarbar fooxxfoo barxxxf barbar fooxxfoo barxxxfo 25 xfoofoobarbar fooxxfoo ba foofoobarbar fooxxfoo bar oofoobarbar fooxxfoo barx ofoobarbar fooxxfoo barxx foobarbar fooxxfoo barxxx oobarbar fooxxfoo barxxxf obarbar fooxxfoo barxxxfo 26 xfoofoobarbar fooxxfoo bar foofoobarbar fooxxfoo barx oofoobarbar fooxxfoo barxx ofoobarbar fooxxfoo barxxx foobarbar fooxxfoo barxxxf oobarbar fooxxfoo barxxxfo 27 xfoofoobarbar fooxxfoo barx foofoobarbar fooxxfoo barxx oofoobarbar fooxxfoo barxxx ofoobarbar fooxxfoo barxxxf foobarbar fooxxfoo barxxxfo 28 xfoofoobarbar fooxxfoo barxx foofoobarbar fooxxfoo barxxx oofoobarbar fooxxfoo barxxxf ofoobarbar fooxxfoo barxxxfo 29 xfoofoobarbar fooxxfoo barxxx foofoobarbar fooxxfoo barxxxf oofoobarbar fooxxfoo barxxxfo 30 xfoofoobarbar fooxxfoo barxxxf foofoobarbar fooxxfoo barxxxfo 31 xfoofoobarbar fooxxfoo barxxxfo 32 33