想实现Button双击事件

Question

在网上找到一段代码        public new event EventHandler DoubleClick;
        DateTime clickTime;
        bool isClicked = false;
        protected override void OnClick(EventArgs e)
        {
            base.OnClick(e);            if (isClicked)
            {
                TimeSpan span = DateTime.Now - clickTime;
                if (span.Milliseconds < SystemInformation.DoubleClickTime)
                {
                    DoubleClick(this, e);
                    isClicked = false;
                }
            }
            else
            {
                isClicked = true;
                clickTime = DateTime.Now;
            }
        }我用以下这段代码调用，没有任何反应Button btn = new Button();
btn.DoubleClick += new EventHandler(btn_DoubleClick);请高手指教

Answer 1

你怎么用的代码。很明显这段代码要求你从Button继承一个类。然后你去用这个继承的button类，而不是原先的button。

Answer 2

using System;
using System.Windows.Forms;namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();            MyButton myButton1 = new MyButton();
            this.Controls.Add(myButton1);            myButton1.DoubleClick += new EventHandler(btn_DoubleClick);
        }        private void btn_DoubleClick(Object sender, EventArgs e)
        {
            MessageBox.Show("btn_DoubleClick");
        }
    }    public class MyButton : Button
    {
        public new event EventHandler DoubleClick;
        DateTime clickTime;
        bool isClicked = false;
        protected override void OnClick(EventArgs e)
        {
            try
            {
                base.OnClick(e);                if (isClicked)
                {
                    TimeSpan span = DateTime.Now - clickTime;
                    if (span.Milliseconds < SystemInformation.DoubleClickTime)
                    {
                        DoubleClick(this, e);
                        isClicked = false;
                    }
                }
                else
                {
                    isClicked = true;
        clickTime = DateTime.Now;
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}