Question

请帮我编一段用C#编的倒计时程序！时间由用户设定，再说一下要在窗体上加什么组件（如timer，textbox等）

注：用户设定时间的时候要以秒为单位，一定要说清楚代码要加在哪个组件里，谢谢！

Answer 1

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

namespace TimerPlus
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        int mytime = 0;
        private void Form1_Load(object sender, EventArgs e)
        {
            this.timer1.Enabled = false;
            this.textBox1.Text = "";
            this.button1.Text = "点击启动倒计时";

        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (this.textBox1.Text.Trim() != "")
            {
                this.timer1.Enabled = true;
                this.timer1.Interval = 1000;
            }
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
           mytime = Convert.ToInt32(textBox1.Text);
           if (mytime > 0)
           {
               mytime -= 1;
               this.textBox1.Text = mytime.ToString();
           }
           else
           {
               this.timer1.Enabled = false;
               this.button1.Text = "倒计时结束";
           }
        }
    }
}

追问

为什么启动了之后没有反应呢