// Distinct not working with LINQ to Objects

​

// see: https://stackoverflow.com/a/1365771/1016343

​

using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var authors2 = new List<Author> {

            new Author ("A", "B" ),

            new Author ("A", "A" ),

            new Author ("A", "B" ),

            new Author ("A", "A" )

        };

        authors2.Distinct().Dump();

    }

}

​

public class Author : IEquatable<Author>

        {

            public string FirstName { get; }

            public string LastName { get; }

​

            public Author(string firstName, string lastName)

            {

                FirstName = firstName;

                LastName = lastName;

            }

​

            public bool Equals(Author other)

            {

                return 

                    other != null &&

                    FirstName == other.FirstName && LastName == other.LastName;

            }

​

            public override int GetHashCode()

            {

                var hashFirstName = 

                    FirstName == null 

                        ? 0 

                        : FirstName.GetHashCode();

​

                var hashLastName = 

                    LastName == null 

                        ? 0 

                        : LastName.GetHashCode();

​

                return hashFirstName ^ hashLastName;

            }

        }

​

​

​