Count repetitive words in string array in C#

Question

I am facing some difficulty when I am trying to find out the count of repeated words in C#.

Code:

using System;
using System.Collections.Generic;
                
public class Program
{
    public static void Main()
    {
        //string[] _list = []; ;
        List<string> a = new List<string>();
        //bool inWord = false;
        string[] arr = {"hello","test","hello","raf"};
            int _counter = 0;
        //int c = 0;
        
        for (int i = 0; i<arr.Length; i++)
        {     
             if (a.Contains(arr[i]))
            {               
                                //Console.WriteLine("second");
                                 _counter++;
                                Console.WriteLine(arr[i] + " : " + _counter); 
            }
            else
            {
                 a.Add(arr[i]); 
                //Console.WriteLine("first");
                _counter++;
                Console.WriteLine(arr[i] + " : " + _counter); 
                //inWord = true;
                //inWord = false;
            }
            _counter = 0;
                 }  
    }
}

Current output looks like:

hello : 1
test : 1
hello : 1
raf : 1

But I want:

hello : 2
test : 1
raf : 1

need help

Answer 1

If you are interested in LINQ:

string[] arr = ["hello", "test", "hello", "raf"];

foreach( var g in arr.GroupBy( a => a ) )
{
    Console.WriteLine( $"{g.Key}: {g.Count( )}" );
}

Answer 2

This is also a way

//string[] _list = []; ;
Dictionary<string, int> a = new Dictionary<string, int>();
//bool inWord = false;
string[] arr = { "hello", "test", "hello", "raf" };
//int c = 0;
for (int i = 0; i < arr.Length; i++)
{
    string key = arr[i];
    if (a.TryGetValue(key, out int value))
    {
        a[key] = ++value;
        Console.WriteLine($"{key} : {value}");
    }
    else
    {
        a.Add(key, 1);
        Console.WriteLine($"{key} : 1");
    }
}
Console.WriteLine($"--------------------------------");
foreach (var item in a)
{
    Console.WriteLine($"{item.Key} : {item.Value}");
}