Question

How to flatten 2D array into a descending order 1D array using Linq in C#

Answer 1

using System;
using System.Linq;
 
class Program
{
    static void Main() {
        int[][] array2d = {
            new[] {4, 5, 3},
            new[] {30, 20},
            new[] {10},
            new[] {1, 2, 6, 7, 8},
        };
 
        var arr = array2d.SelectMany(array => array).OrderByDescending(x => x);
 
        Console.WriteLine(string.Join(", ", arr));
    }
}
 
 
 
/*
run:
 
30, 20, 10, 8, 7, 6, 5, 4, 3, 2, 1
 
*/

 

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