Winform 中的KeyDown

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.Xml;
using System.Runtime.InteropServices;

namespace WindowsFormsApplication1
{
    public partial class Main : Form
    {
        public Main()
        {
            this.KeyPreview = true;
            InitializeComponent();
            //TopMost = true;
            LoadMax();
        }

        private void picXS_Click(object sender, EventArgs e)
        {
            Form1 form = new Form1();
            this.Hide();
            form.Show();
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("确认注销吗？", "请确认", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {

                Login login = new Login();
                this.Hide();
                login.Show();
            }
        }

        private void pictureBox2_Click(object sender, EventArgs e)
        {
            SelectShowInfo select = new SelectShowInfo();
            this.Hide();
            select.Show();
        }

        private void pictureBox3_Click(object sender, EventArgs e)
        {

            SubInfo info = new SubInfo();
            this.Hide();
            info.Show();

           
        }

        private void Main_Load(object sender, EventArgs e)
        {

        }



        public void LoadMax()
        {
            if (this.WindowState == FormWindowState.Maximized)
            {
                this.WindowState = FormWindowState.Normal;
            }
            else
            {
                this.FormBorderStyle = FormBorderStyle.None;
                this.WindowState = FormWindowState.Maximized;
            }
        }

  

        private void pictureBox5_Click(object sender, EventArgs e)
        {
            SubSummary subsum = new SubSummary();
            this.Hide();
            subsum.Show();
        }



        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
           

           
        }

        private void Main_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.F7)
            {
                WEB main = new WEB();
                this.Hide();

                main.Show();
            }


          

            if (e.KeyCode == Keys.NumPad1)
            {
                picXS_Click(sender, e);

            }

            if (e.KeyCode == Keys.NumPad2)
            {
                pictureBox2_Click(sender, e);

            }

            if (e.KeyCode == Keys.NumPad3)
            {
                pictureBox5_Click(sender, e);

            }

            if (e.KeyCode == Keys.NumPad4)
            {
                pictureBox3_Click(sender, e);

            }

            if (e.KeyCode == Keys.NumPad5)
            {
                pictureBox1_Click(sender, e);

            }

            if (e.KeyCode == Keys.NumPad6) {
                picBminPwd_Click(sender,e);
            }

            //禁止相关快捷键
            if (e.Modifiers == Keys.Alt
                || e.Modifiers == Keys.LWin
                || e.Modifiers == Keys.RWin
              )
            {
              e.Handled = true;
            }

            //弹出Password窗体
            //if (e.Alt == true)
            //{
            //  PassWords password = new PassWords();
            //  e.Handled = false;
            //  password.Show();
            //}
        }

        private void picBminPwd_Click(object sender, EventArgs e)
        {

            PassWords pwd = new PassWords();
            pwd.ShowDialog();

        }


        ////倒计时
        //[StructLayout(LayoutKind.Sequential)]

        //struct LASTINPUTINFO
        //{
        //  [MarshalAs(UnmanagedType.U4)]
        //  public int cbSize;

        //  [MarshalAs(UnmanagedType.U4)]
        //  public uint dwTime;
        //}

        //[DllImport("user32.dll")]

        //static extern bool GetLastInputInfo(ref LASTINPUTINFO plii);

        //static long GetLastInputTime()
        //{
        //  LASTINPUTINFO vLastInputInfo = new LASTINPUTINFO();
        //  vLastInputInfo.cbSize = Marshal.SizeOf(vLastInputInfo);

        //  if (!GetLastInputInfo(ref vLastInputInfo))

        //    return 0;

        //  return Environment.TickCount - (long)vLastInputInfo.dwTime;
        //}

        //private void timer1_Tick(object sender, EventArgs e)
        //{
        //  if (GetLastInputTime() > 3000)
        //  {
        //    timer1.Stop();

        //    Screen screen = new Screen();

        //    this.Hide();

        //    screen.Show();
        //  }
        //}

      
    }
}