Windows 表单计时器运行不稳定

Question

我正在尝试通过计时器控制进度条 - 也就是说，让进度条在每个 timer_Tick 时前进其最大值的 10%。奇怪的是，虽然进度条似乎确实随着 timer_Tick 前进，但似乎每个滴答声都是成对出现的（也就是说，我得到了两次滴答声）。这是代码：

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

        private void Form1_Load(object sender, EventArgs e)
        {
            timer1.Enabled = false;     //Set to false to prevent timer from auto-starting.
            timer1.Interval = 1000;
            progressBar1.Maximum = 10;
        }

        // COMBO BOX
        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        // START BUTTON
        private void button1_Click(object sender, EventArgs e)
        {
            button1.Text = "CANCEL TEST";
            comboBox1.Enabled = false;
            timer1.Start();
            timer1.Tick += new EventHandler(timer1_Tick);
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            if (progressBar1.Value != 10)
            {
                progressBar1.Value++;
            }
            else
            {
                timer1.Stop();
                button1.Text = "START AGAIN";
                comboBox1.Enabled = true;
                progressBar1.Value = 0;
            }
        }
    }
}

timer1.Start只依赖于button1_Click。有没有人经历过这种奇怪的行为？我的代码中有菜鸟错误吗？

Answer 1

只添加一次处理程序。将此行移至窗体的构造函数：

timer1.Tick += new EventHandler(timer1_Tick);

或者如果您已经使用设计器创建了 tick 事件，则完全删除该行。

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