c#窗体简易倒计时器

首先在窗体中从工具箱中添加label 和 timer两个控件

主函数如下：

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;

namespace TIME
{
   
    public partial class Form1 : Form
    {
        TimeSpan dtTo = new TimeSpan(0,50,0); //设置开始时间
        public Form1()
        {
           
            InitializeComponent();
        }
        private void timer1_Tick(object sender, EventArgs e)
        {
            dtTo = dtTo.Subtract(new TimeSpan(0, 0, 1));
            label1.Text = dtTo.Hours.ToString() + ":" + dtTo.Minutes.ToString() + ":" + dtTo.Seconds;

            if (dtTo.TotalSeconds < 0.0)//当倒计时完毕
            {
                timer1.Enabled = false;   //其中可自行添加相应的提示框或者方法函数
            }
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Interval = 1000;//设置每次间隔1s
            timer1.Enabled = true;
            
        }
    }
}