Windows C＃內存不足通知

Question

如何從c＃訂閱Windows內存不足通知？

我們的c＃應用程序具有大量非托管內存分配，如果操作系統內存可用性較低，則可以釋放該內存。

Answer 1

使用CreateMemoryResourceNotification和QueryMemoryResourceNotification檢查內存狀態

    enum MemoryResourceNotificationType : int
    {
        LowMemoryResourceNotification = 0,
        HighMemoryResourceNotification = 1,
    }

    [DllImport("kernel32.dll", SetLastError = true)]
    static extern IntPtr CreateMemoryResourceNotification(MemoryResourceNotificationType notificationType);

    [DllImport("kernel32.dll", SetLastError = true)]
    internal static extern bool QueryMemoryResourceNotification(IntPtr resourceNotificationHandle, out int resourceState);

    private static IntPtr MemoryResourceNotificationHandle;

    public static void TryReclaim()
    {
        MemoryResourceNotificationHandle = CreateMemoryResourceNotification(MemoryResourceNotificationType.LowMemoryResourceNotification);

        int sleepIntervalInMs = ReclaimIntervalInSeconds * 1000;

        while (true)
        {
            Thread.Sleep(10_000);

            bool isSuccecced = QueryMemoryResourceNotification(MemoryResourceNotificationHandle, out int memoryStatus);

            if (isSuccecced)
            {
                if (memoryStatus >= 1)
                {
                   DoReclaim();
                }

            }

        }           


    }