C#鼠标控制控件移动的示例

//鼠标点击控件按住不放，控件跟随移动。施放则不移动
//这里的控件可以更换为其他控件。
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 Test
{
    public partial class Form1 : Form
    {
        private int ax, ay;  // 定义两个变量存储鼠标的横纵坐标
        public Form1()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 鼠标首次单击控件，记录鼠标坐标
        /// </summary>
        /// <param ax="int">鼠标横坐标</param>
        /// <param ay="int">鼠标纵坐标</param>
        private void button1_MouseDown(object sender, MouseEventArgs e)
        {
            ax = e.X;
            ay = e.Y;
        }

        /// <summary>
        /// 鼠标移动时，控件跟随鼠标移动。利用相对坐标计算
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                button1.Left = button1.Left + (e.X - ax);
                button1.Top = button1.Top + (e.Y - ay);
            }
        }
    }
}