Sort an Array in Descending Order in C#

  1. Use the Array.Sort() and Array.Reverse() Method to Sort an Array in Descending Order in C
  2. Use the OrderByDescending() Method to Sort an Array in Descending Order in C

This article will introduce different methods to sort an array in descending order in C#.

Use the Array.Sort() and Array.Reverse() Method to Sort an Array in Descending Order in C

We will use the two methods Array.sort() and Array.Reverse() collectively to sort an array in descending order. The Array.Sort() method sorts the array in ascending order. We will reverse the array using Array.Reverse() method to sort our array in descending order. There are multiple overloads of these methods. The correct syntax to use these methods is as follows.

Array.Sort(Array array);

This overload of the method Sort() has one parameter only. The detail of its parameter is as follows

Parameters Description
array mandatory This is the array that we want to sort.

This function sorts the array in ascending order.

Array.Reverse(Array array);

This overload of the method Reverse() has one parameter only. The detail of its parameter is as follows.

Parameters Description
array mandatory This is the array that we want to reverse.

This function reverses the given array.

The program below shows how we can use the Sort() and Reverse() methods to sort an array in descending order.

using System; 
  
class Sort { 
      public static void Main() 
    { 
        int[] arr = new int[] {2, 10, 5, 8, 4, 11}; 
        Console.WriteLine("Array Before Sorting:\n");
        foreach(int value in arr) 
        { 
            Console.Write(value + " "); 
        } 
        Console.WriteLine("\n");
        Array.Sort(arr); 
        Array.Reverse(arr); 
        Console.WriteLine("Array After Sorting:\n"); 
        foreach(int value in arr) 
        { 
            Console.Write(value + " "); 
        } 
    } 
} 

Output:

Array Before Sorting:

2 10 5 8 4 11 

Array After Sorting:

11 10 8 5 4 2 

Use the OrderByDescending() Method to Sort an Array in Descending Order in C

In C#, we can also use the LINQ’s OrderByDescending() method to sort an array in descending order. There are multiple overloads of this method. The overload that we will use has two parameters. The correct syntax to use this method is as follows.

Array.OrderByDescending(source, keySelector);

The details of its parameters are as follows

Parameters Description
source It is the sequence of values to order.
keySelector It is the function to extract a key from an element.

This function sorts the array and returns an IOrderedEnumerable. We will convert it to an array using the ToArray() method.

The program below shows how we can use the OrderByDescending() method to sort an array in descending order.

using System; 
using System.Linq;

class Sort { 
    public static void Main() 
    { 
        int[] arr = new int[] {2, 10, 5, 8, 4, 11}; 
        Console.WriteLine("Array Before Sorting:\n");
        foreach(int value in arr) 
        { 
            Console.Write(value + " "); 
        } 
        Console.WriteLine("\n");
        arr = arr.OrderByDescending(c => c).ToArray();
        Console.WriteLine("Array After Sorting:\n"); 
        foreach(int value in arr) 
        { 
            Console.Write(value + " "); 
        } 
    } 
} 

Output:

Array Before Sorting:

2 10 5 8 4 11 

Array After Sorting:

11 10 8 5 4 2
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