Distinct Operator : Distinct « LINQ « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. LINQ
3. Distinct

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

public class MainClass {
    public static void Main() {
        string[] presidents = {"Grant", "Harding", "Harrison", "Hayes", "Hoover", "Jackson"};
        Console.WriteLine("presidents count:  " + presidents.Count());
        IEnumerable<string> presidentsWithDupes = presidents.Concat(presidents);
        Console.WriteLine("presidentsWithDupes count:  " + presidentsWithDupes.Count());
        IEnumerable<string> presidentsDistinct = presidentsWithDupes.Distinct();
        Console.WriteLine("presidentsDistinct count:  " + presidentsDistinct.Count());
    }
}