winform 关闭窗体 释放内存

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

using System.Runtime.InteropServices;
using System.Diagnostics;
namespace ReleaseMemory_Win
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
            FlushMemory();
        }

        [DllImport("kernel32.dll")]
        private static extern bool SetProcessWorkingSetSize(IntPtr process, int minSize, int maxSize);
        private static void FlushMemory()
        {
            GC.Collect();
            GC.WaitForPendingFinalizers();
            if (Environment.OSVersion.Platform == PlatformID.Win32NT)
                SetProcessWorkingSetSize(Process.GetCurrentProcess().Handle, -1, -1);
        }
    }