适时释放一下内存

        [DllImport("kernel32.dll")]
        public static extern bool SetProcessWorkingSetSize(IntPtr process, int minSize, int maxSize);

        public static void GarbageCollect()
        {
            GC.Collect();
            GC.WaitForPendingFinalizers();
            GC.Collect();
        }

        public static void FlushMemory()
        {
            GarbageCollect();

            if (Environment.OSVersion.Platform == PlatformID.Win32NT)
            {
                SetProcessWorkingSetSize(System.Diagnostics.Process.GetCurrentProcess().Handle, -1, -1);
            }
        }