c# - 如何做一个 30 分钟的倒数计时器

Question

我想让我的 textbox1.Text 倒计时 30 分钟。到目前为止我有这个:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }

    private void button1_Click(object sender, EventArgs e)
    {
        Timer timeX = new Timer();
        timeX.Interval = 1800000;
        timeX.Tick += new EventHandler(timeX_Tick);
    }

    void timeX_Tick(object sender, EventArgs e)
    {
        // what do i put here?
    }
}

但是我现在很困惑。我通过 Google 查找了答案，但找不到与我的问题相符的答案。

Answer 1

这是一个类似于您发布的代码的简单示例:

using System;
using System.Windows.Forms;

namespace StackOverflowCountDown
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            textBox1.Text = TimeSpan.FromMinutes(30).ToString();
        }

        private void Form1_Load(object sender, EventArgs e) { }

        private void textBox1_TextChanged(object sender, EventArgs e) { }

        private void button1_Click(object sender, EventArgs e)
        {
            var startTime = DateTime.Now;

            var timer = new Timer() { Interval = 1000 };

            timer.Tick += (obj, args) =>    
                textBox1.Text =
                    (TimeSpan.FromMinutes(30) - (DateTime.Now - startTime))
                    .ToString("hh\\:mm\\:ss");

            timer.Enabled = true;
        }
    }
}