C#倒计时

柔光的暖阳◎ 2023-01-19 03:09 284阅读 0赞

C\#新手，记录一下倒计时，30s的倒计时，附上效果图

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hlcm9fcm9uZw_size_16_color_FFFFFF_t_70][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hlcm9fcm9uZw_size_16_color_FFFFFF_t_70 1][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hlcm9fcm9uZw_size_16_color_FFFFFF_t_70 2][]![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hlcm9fcm9uZw_size_16_color_FFFFFF_t_70 3][]

### 第一步，拖入 Timer 控件 ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hlcm9fcm9uZw_size_16_color_FFFFFF_t_70 4][]

### 第二步，页面上放一个label（显示倒计时时间） ###

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hlcm9fcm9uZw_size_16_color_FFFFFF_t_70 5][]

### 第三步，设置开始的时间（这里是30s），让时间每隔一秒钟就减一，直到0就停止倒计时 ###

using System;
    using System.Data;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Threading.Tasks;
    using System.Windows.Forms;
    
    namespace FrontierApp.HomepageAuth
    {
        public partial class Scan : Form
        {
            HomepageAuth.empower anotherForm;
            int sec = 29;
    
            public Scan()
            {
                InitializeComponent();
    
                label4.Text = "29";
                this.timer1.Interval = 1000; //设置间隔时间，为毫秒；
                this.timer1.Tick += new System.EventHandler(this.timer1_Tick);
                this.timer1.Start();
            }
    
            private void timer1_Tick(object sender, EventArgs e)
            {
                sec--;
                if (sec < 10)
                {
                    label4.TextAlign = ContentAlignment.TopCenter;
                    label4.Text = sec.ToString();
                }
    
                label4.Text = sec.ToString();
    
                if (sec == 0)
    
                {
                    sec = 0;
                    label4.Text = "0";
                    this.timer1.Stop();
                }
            }
    
        }
    }

### 第四步，两位数的时候 label 的样式和个位数的时候是不一样的，所以这里我们也要调整一下 ###

label4.TextAlign = ContentAlignment.TopCenter;

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0hlcm9fcm9uZw_size_16_color_FFFFFF_t_70 6][]

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