C#: Count file extensions and group it

Last update on December 20 2024 12:42:16 (UTC/GMT +8 hours)

Write a program in C# Sharp to count file extensions and group it using LINQ.

Sample Solution:

C# Sharp Code:

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

// Define a class named LinqExercise15
class LinqExercise15
{
    // Main method, the entry point of the program
    public static void Main()
    {
        // Initialize an array of file names with different extensions
        string[] arr1 = { "aaa.frx", "bbb.TXT", "xyz.dbf", "abc.pdf", "aaaa.PDF", "xyz.frt", "abc.xml", "ccc.txt", "zzz.txt" };

        // Display information about the program
        Console.Write("\nLINQ : Count file extensions and group it : ");
        Console.Write("\n------------------------------------------\n");

        // Display the files present in the array
        Console.Write("\nThe files are : aaa.frx, bbb.TXT, xyz.dbf,abc.pdf");
        Console.Write("\n                aaaa.PDF,xyz.frt, abc.xml, ccc.txt, zzz.txt\n");

        Console.Write("\nHere is the group of extension of the files : \n\n");

        // Using LINQ, group file extensions and count their occurrences
        var fGrp = arr1.Select(file => Path.GetExtension(file).TrimStart('.').ToLower())
                     .GroupBy(z => z, (fExt, extCtr) => new
                     {
                         Extension = fExt,
                         Count = extCtr.Count()
                     });

        // Iterate through the grouped file extensions and display the count of each extension
        foreach (var m in fGrp)
            Console.WriteLine("{0} File(s) with {1} Extension ", m.Count, m.Extension);

        Console.ReadLine(); // Wait for user input before closing the program
    }
}

Sample Output:

LINQ : Count File Extensions and Group it :                                                                   
------------------------------------------                                                                        
The files are : aaa.frx, bbb.TXT, xyz.dbf,abc.pdf                                                             
                aaaa.PDF,xyz.frt, abc.xml, ccc.txt, zzz.txt                                                   
      
Here is the group of extension of the files :                                                                 
      
1 File(s) with .frx Extension                                                                                 
3 File(s) with .txt Extension                                                                                 
1 File(s) with .dbf Extension                                                                                 
2 File(s) with .pdf Extension                                                                                 
1 File(s) with .frt Extension                                                                                 
1 File(s) with .xml Extension 

Visual Presentation:

Flowchart:

C# Sharp Code Editor:

Click to Open Editor

Contribute your code and comments through Disqus.

Previous: Write a program in C# Sharp to find the n-th Maximum grade point achieved by the students from the list of students.
Next: Write a program in C# Sharp to Calculate Size of File using LINQ.