public void RunDemo()
{
IEnumerable <Singer> singers = DemoCollections.GetSingers();
Singer singer = singers.FirstOrDefault(s => s.Id == 100);
Console.WriteLine(singer == null ? "No such singer" : singer.LastName);
}
public void RunDemo()
{
string[] bands = { "ACDC", "Queen", "Aerosmith", "Iron Maiden", "Megadeth", "Metallica", "Cream", "Oasis"
, "Abba", "Blur", "Chic", "Eurythmics", "Genesis", "INXS", "Midnight Oil","Kent", "Madness", "Manic Street Preachers"
, "Noir Desir", "The Offspring", "Pink Floyd", "Rammstein", "Red Hot Chili Peppers", "Tears for Fears"
, "Deep Purple", "KISS" };
bool contains = bands.Contains("Queen");
Console.WriteLine(contains);
IEnumerable <Singer> singers = DemoCollections.GetSingers();
Singer s = new Singer()
{
Id = 2, FirstName = "Elvis", LastName = "Presley", BirthYear = 1954
};
bool containsSinger = singers.Contains(s, new DefaultSingerComparer());
Console.WriteLine(containsSinger);
}
