聽說讀寫

public static class Program
{
    internal sealed class GenObj
    {
        ~GenObj()
        {
            Console.WriteLine("In Finalize method");
        }
    }
    public static void Main()
    {
        Console.WriteLine("Maximum generations: " + GC.MaxGeneration);
        // Create a new GenObj in the heap.
        Object o = new GenObj();
        // Because this object is newly created, it is in generation 0.
        Console.WriteLine("Gen " + GC.GetGeneration(o)); // 0  這個方法是用來獲取對象在第幾代

        // Performing a garbage collection promotes the object's generation.
        GC.Collect();
        Console.WriteLine("Gen " + GC.GetGeneration(o)); // 1 每次GC以后還存活的單位就升級
        GC.Collect();
        Console.WriteLine("Gen " + GC.GetGeneration(o)); // 2 每次GC以后還存活的單位就升級
        GC.Collect();
        Console.WriteLine("Gen " + GC.GetGeneration(o)); // 2 (max) 每次GC以后還存活的單位就升級 最高只有2級 - -#

        o = null; // 移除強引用關系
        Console.WriteLine("Collecting Gen 0");
        GC.Collect(0); // Collect generation 0. 回收指定代的內存
        GC.WaitForPendingFinalizers(); // Finalize is NOT called.
        Console.WriteLine("Collecting Gens 0, and 1");
        GC.Collect(1); // Collect generations 0 & 1.
        GC.WaitForPendingFinalizers(); // Finalize is NOT called.
        Console.WriteLine("Collecting Gens 0, 1, and 2");
        GC.Collect(2); // Same as Collect()
        GC.WaitForPendingFinalizers(); // Finalize IS called.  這里這個對象才被徹底做掉了....
    }
 
}