WinForm实现程序一段时间不运行自动关闭的方法

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Text;using System.Windows.Forms;using System.Net;using System.IO;using System.Security.Cryptography.X509Certificates;using System.Net.Security;namespace DemoDataGridView{ public partial class Form3 : Form, IMessageFilter {  private int m_WaitMinute = 0;  System.Windows.Forms.Timer MyTimer;  public Form3()  {   InitializeComponent();   MyTimer = new Timer();   MyTimer.Interval = 1000;   MyTimer.Tick += new EventHandler(MyTimer_Tick);   Application.Idle += new EventHandler(Application_Idle);  }  void MyTimer_Tick(object sender, EventArgs e)  {   if (m_WaitMinute < 60)   {    MyTimer.Enabled = true;    MyTimer.Interval = 10000; //10秒    m_WaitMinute += 1;    // this.Opacity = 1.0 - Convert.ToDouble(m_WaitMinute / 60.0);   }   else   {    MyTimer.Enabled = false;   }  }  void Application_Idle(object sender, EventArgs e)  {   if (m_WaitMinute == 0)   {    System.IO.File.WriteAllText("D://1.txt", DateTime.Now.ToString());    MyTimer.Start();   }   else   {    if (m_WaitMinute >= 6)    {     System.IO.File.WriteAllText("D://2.txt", DateTime.Now.ToString());     this.Close();    }   }  }  public bool PreFilterMessage(ref Message m)  {   if (m_WaitMinute != 0)   {    m_WaitMinute = 0;    MyTimer.Enabled = false;    return true;   }   return false;  } }}