C# 在窗体上可拖动控件

　　最近做了一个标签打印配置功能，需要根据客户需求自定义标签格式、显示内容，这时就用到了后台生成控件，并且其控件可在窗口中进行拖动，这里仅为记录一下实现过程，方便以后使用。

结果图：

源码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

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

        PictureBox picture;
        Point downPoint;

        private void button1_Click(object sender, EventArgs e)
        {
            picture = new PictureBox();
            picture.Name = "picture" + DateTime.Now.ToString("yyyyMMddHHmmss");     //图片name
            picture.Image = Image.FromFile("F:\\ChromeDownload\\43e66f0c6da21dc3d563bb48e32d4c0e.jpg");      //图片路径
            picture.Width = 240;         //图片宽度
            picture.Height = 135;        //图片高度
            picture.SizeMode = PictureBoxSizeMode.StretchImage;                 //指定图片显示格式
            picture.MouseDown += new MouseEventHandler(pictureBox_MouseDown);   //鼠标按下事件
            picture.MouseMove += new MouseEventHandler(pictureBox_MouseMove);   //鼠标移动事件
            picture.Location = new Point(10,10);    //location:x,y
            picture.Parent = panelControls;
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        /// <summary>
        /// 鼠标按下事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void pictureBox_MouseDown(object sender, MouseEventArgs e)
        {
            picture = (PictureBox)sender;       //指定当前元素
            downPoint = e.Location;
        }

        /// <summary>
        /// 鼠标移动事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void pictureBox_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                picture.Location = new Point(picture.Location.X + e.X - downPoint.X,
                   picture.Location.Y + e.Y - downPoint.Y); 
            }
        }
    }
}