1.介面

窗體中還有一個定時器  timer1 ，其有一個定時事件 timer1_Tick

2.程式碼

using System;
using System.Diagnostics;
using System.Windows.Forms;

namespace 定時關機工具 {
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Start();
            //數字選擇框不可用，除非選擇了計劃關機CheckBox
            numericUpDown1.Enabled = false;
            numericUpDown2.Enabled = false;
            numericUpDown3.Enabled = false;
        }

        //定時器出發事件
        private void timer1_Tick(object sender, EventArgs e)
        {
            label1.Text = DateTime.Now.ToString();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                if (MessageBox.Show("將要設定計劃關機，是否確認操作？", "提示", MessageBoxButtons.OKCancel) == DialogResult.OK)
                {
                    decimal decl = numericUpDown1.Value * 3600 + numericUpDown2.Value * 60 + numericUpDown3.Value;
                    string str = decl.ToString();
                    // -t xx   表示多少秒之後
                    Process.Start("shutdown.exe", "-s -t " + str);
                }
            }
            else
            {
                if (MessageBox.Show("是否確認關機？", "提示", MessageBoxButtons.OKCancel) == DialogResult.OK)
                {
                    Process.Start("shutdown.exe", "-s");
                }
            }
        }

// -t 10 表示10秒之後
        private void button2_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("是否確認重啟？", "提示", MessageBoxButtons.OKCancel) == DialogResult.OK)
            {
                Process.Start("shutdown.exe", "-r");
                Process.Start("shutdown.exe", "-r -t 10");
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            if (MessageBox.Show("是否確認登出？", "提示", MessageBoxButtons.OKCancel) == DialogResult.OK)
                Process.Start("shutdown.exe", "-l");
        }
       
        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            if (checkBox1.Checked)
            {
                numericUpDown1.Enabled = true; numericUpDown2.Enabled = true;
                numericUpDown3.Enabled = true; button1.Text = "計劃關機";
            }
            else
            {
                numericUpDown1.Enabled = false; numericUpDown2.Enabled = false;
                numericUpDown3.Enabled = false; button1.Text = "關機";
            }
        }
        
    }
}