示例程式碼

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;

public static class ControlDrag
{
    static Dictionary<string, Point> _locationList = new Dictionary<string, Point>();
    static Dictionary<string, bool> _isDownList = new Dictionary<string
 
, bool>();
    //擴充套件函式
    public static void AddDrag(this Control control)
    {
        if (_locationList.ContainsKey(control.Name)==false)
        {
            _locationList.Add(control.Name, new Point() );
            _isDownList.Add(control.Name, false);
　　　　　　　　
　　　　　　　　
            //按下滑鼠
            control.MouseDown 
 
+= (s, ev) =>
            {

                _isDownList[control.Name] = true;
                _locationList[control.Name] = new Point(ev.X, ev.Y);
            };
            //鬆開滑鼠
            control.MouseUp += (s, ev) =>
            {

                _isDownList[control.Name] = false;

            };
            //滑鼠移動
            control.MouseMove 
 
+= (s, ev) =>
            {
                if (_isDownList[control.Name])
                {
                    int left = control.Left + ev.X - _locationList[control.Name].X;
                    int top = control.Top + ev.Y - _locationList[control.Name].Y;
                    control.Location = new Point(left, top);
                }
            };


        }
       
    }

}

呼叫方式

private void Form1_Load(object sender, EventArgs e)
{

//可以是任何控制元件
panel1.AddDrag();

//可以是任何控制元件
 label1.AddDrag(); 

}