static void Main(string[] args)
{
Console.WriteLine("**** Fun with lazy inastantiation ****");
MediaPlayer mp = new MediaPlayer();
mp.Play();
MediaPlayer mp2 = new MediaPlayer();
AllTracks tracks = mp2.GetAllTracks();
Console.ReadLine();
}
static void Main(string[] args)
{
// 这里没有分配AkkTracks对象
MediaPlayer myPlayer = new MediaPlayer();
myPlayer.Play();
// 在调用GetAllTracks()时分配AllTracks
MediaPlayer yourPlayer = new MediaPlayer();
AllTracks yourMusic = yourPlayer.GetAllTracks();
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with Lazy Instantiation *****\n");
// This caller does not care about getting all songs,
// but indirectly created 10,000 objects!
MediaPlayer myPlayer = new MediaPlayer();
myPlayer.Play();
MediaPlayer yourPlayer = new MediaPlayer();
AllTracks yourMusic = yourPlayer.GetAllTracks();
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with Lazy Instantiation *****\n");
// No allocation of AllTracks object here!
MediaPlayer myPlayer = new MediaPlayer();
myPlayer.Play();
// Allocation of AllTracks happens when you call GetAllTracks().
MediaPlayer yourPlayer = new MediaPlayer();
AllTracks yourMusic = yourPlayer.GetAllTracks();
Console.ReadLine();
}
static void Main(string[] args)
{
// Никакого размещения объекта AllTracks здесь не происходит
// из-за ленивого создания объектов
MediaPlayer myPlayer = new MediaPlayer();
myPlayer.Play();
// Размещение объекта AllTracks происходит
// только в случае вызова метода GetAllTracks()
MediaPlayer yourPlayer = new MediaPlayer();
AllTracks yourMusic = yourPlayer.GetAllTracks();
Console.ReadLine();
}
static void Main(string[] args)
{
Console.WriteLine("***** Fun with Lazy Instantiation *****\n");
// This caller does not care about getting all songs,
// but indirectly created 10,000 objects!
// With Lazy<AllTracks>, no allocation of AllTracks object here!
MediaPlayer myPlayer = new MediaPlayer();
myPlayer.Play();
// Alloctation of AllTracks happens when you call GetAllTracks().
MediaPlayer yourPlayer = new MediaPlayer();
AllTracks yourMusic = yourPlayer.GetAllTracks();
Console.ReadLine();
}
static void UseLazyObject()
{
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine("=> Playback a song");
MediaPlayer player = new MediaPlayer();
player.Play();
MediaPlayer yourPlayer = new MediaPlayer();
AllTracks yourMusic = yourPlayer.GetAllTracks();
if (yourMusic == null)
{
Console.WriteLine("GetAllTracks() return null");
}
else
{
Console.WriteLine($"Songs size <{yourMusic.Size()}>");
yourMusic.Choose(0);
yourMusic.Choose(1);
}
}
