呼ばれないファイナライザー

public class ExampleClass
{
Stopwatch sw;

public ExampleClass()
{
sw = Stopwatch.StartNew();
Console.WriteLine("Instantiated object");
}

public void ShowDuration()
{
Console.WriteLine("This instance of {0} has been in existence for {1}",this, sw.Elapsed);
}

~ExampleClass()
{
Console.WriteLine("Finalizing object");
sw.Stop();
Console.WriteLine("This instance of {0} has been in existence for {1}",this, sw.Elapsed);
}
}

public class Demo
{
public static void Main()
{
ExampleClass ex = new ExampleClass();
ex.ShowDuration();
}
}

namespace ConsoleApp1103
{
class Program
{
static void Main(string[] args)
{
var tester = new Tester();

var current = Assembly.GetExecutingAssembly();

AssemblyLoadContext.GetLoadContext(current).Unloading += sender =>
{
Console.WriteLine("コンテクストアンロード");
};

GC.Collect();

tester = null;

GC.Collect();

GC.Collect();

}
}

public class Tester
{
public Tester() => Console.WriteLine("コンストラクタ");

~Tester() => Console.WriteLine("ファイナライザー");

}
}

namespace WpfApp1
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();

Debug.WriteLine("スタート");

var current = Assembly.GetExecutingAssembly();

AssemblyLoadContext.GetLoadContext(current).Unloading += sender =>
{
Debug.WriteLine("アプリケーション終了");
};
}

private int count = 0;

private void Button_Click(object sender, RoutedEventArgs e)
{
var tester = new Tester(++count);

tester = null;
}

public class Tester
{
private int _id;

public Tester(int id)
{
_id = id;

Debug.WriteLine($"☆コンストラクタ {_id}");
}

~Tester() => Debug.WriteLine($"★ファイナライザー {_id}");

}
}
}