为什么垃圾收集器不触发终结器？

如何解决为什么垃圾收集器不触发终结器？

我有这个小程序（真正的程序当然大不相同）。

public readonly struct PinValue : IEquatable<PinValue>
{
    // This isn't bool so the struct will retain blittable. This
    // allows arrays of PinValue and structs that contain PinValue to
    // be stack allocated.
    private readonly byte _value;

    private PinValue(byte value) => _value = value;

    /// <summary>
    /// The value of the pin is high.
    /// </summary>
    public static PinValue High => new PinValue(1);

    /// <summary>
    /// The value of the pin is low.
    /// </summary>
    public static PinValue Low => new PinValue(0);

这是输出：

using System;

namespace Finalizer
{
    public class Simple
    {
        public Simple()
        {
            Console.WriteLine("Constructor");
        }
        ~Simple()
        {
            Console.WriteLine("Finalizer");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Hello World!");
            var s = new Simple();
            s = null;
            GC.Collect();
            Console.WriteLine("Collected");
            Console.ReadKey();
        }
    }
}

我不明白为什么我看不到 Hello World! Constructor Collected 行。

有人吗？