Find non repeating characters in a string using LINQ

Commonly we need to find the characters in a string which are not repeated or which occurs only once.We can use the following LINQ example to find such characters.

Though this is a short string but you can see that even in this string all characters are repeated except M,L and O.

We first iterate through the string characters one at a time.Then we compare if the last index of that character is same as the first index.If that is the case then we return that element.


using System;
using System.Collections.Generic;
using System.Linq;

namespace LINQ
{
public class Program
{
public static void Main(string[] args)
{
string examplestring=”THIS IS A SIMPLE STRING TO TEST REPEATING CHARACRTERS”;
var chars=examplestring.Where(ch=>examplestring.IndexOf(ch)==examplestring.LastIndexOf(ch));
foreach(var ch in chars)
{
Console.WriteLine(ch);
}

}
}
}

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