Question

How to create alphabetical four letters combinations using LINQ in C#

Answer 1

using System;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        var letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".ToCharArray();

        var sequence = from one in letters
                       from two in letters
                       from three in letters
                       from four in letters
                       orderby one, two, three, four
                       select new string(new[] { one, two, three, four });

        foreach (var s in sequence.Take(20)) {
            Console.WriteLine(s);
        }

        Console.WriteLine("...");
        Console.WriteLine("Total sequence size: " + sequence.Count());
    }
}



/*
run:

AAAA
AAAB
AAAC
AAAD
AAAE
AAAF
AAAG
AAAH
AAAI
AAAJ
AAAK
AAAL
AAAM
AAAN
AAAO
AAAP
AAAQ
AAAR
AAAS
AAAT
...
Total sequence size: 456976

*/

 

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