.net中清理内存，清理占用内存方式方法

#region 内存回收
       [DllImport("kernel32.dll", EntryPoint = "SetProcessWorkingSetSize")]
        public static extern int SetProcessWorkingSetSize(IntPtr process, int minSize, int maxSize);
        /// <summary>   
        /// 释放内存  
        /// </summary>   
        public static void ClearMemory()
        {
            GC.Collect();
            GC.WaitForPendingFinalizers();
            if (Environment.OSVersion.Platform == PlatformID.Win32NT)
            {
                SetProcessWorkingSetSize(System.Diagnostics.Process.GetCurrentProcess().Handle, -1, -1);
            }
        }
        #endregion

public Form1()
         {
             InitializeComponent();
            
            //每1分钟 检查一次
            System.Timers.Timer timer = new System.Timers.Timer(60 * 1000);
            timer.Elapsed += timer_Elapsed;
            timer.Start();
         }
 
        private void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            //1 比较时间是否有效  HH:mm
            DateTime starttime = e.SignalTime;
            string time = ConfigurationManager.AppSettings["ClearMemory_PerdayTime"];//"05:00"
            string dtNow = starttime.ToString("yyyy-MM-dd HH:mm");
            DateTime dayDefine = DateTime.Parse(starttime.ToString("yyyy-MM-dd") + " " + time);
            if (dayDefine.ToString("yyyy-MM-dd HH:mm") == dtNow)
            {
                //2 启动垃圾收集器
                ClearMemory();
                LogWarning(DateTime.Now.ToLongTimeString() + " :释放内存!");
            }
        }