EqualityComparer, C#

EqualityComparer

//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
        var list = new List<Item>();
        list.Add(new Item() { Key = 5, Value = "Bird" });
        list.Add(new Item() { Key = 5, Value = "Frog" });
        list.Add(new Item() { Key = 10, Value = "Bird" });
        list.Add(new Item() { Key = 10, Value = "Frog" });

// Get distinct items using IEqualityComparer.
        // ... The Key field is used to see if two items are equal.
        var result = list.Distinct(new ItemEqualityComparer());

foreach (var item in result)
            {
                Console.WriteLine("DISTINCT ITEM = "+item.Key.ToString()+" "+ item.Value.ToString());
            }
        }
       
    }
    class Item
{
    public int Key;
    public string Value;
}

class ItemEqualityComparer : IEqualityComparer<Item>
{
    public bool Equals(Item x, Item y)
    {
        // Two items are equal if their keys are equal.
        return x.Key == y.Key;
    }

public int GetHashCode(Item obj)
    {
        return obj.Key.GetHashCode();
    }
}
}


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