winform控件拖动

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>();
    //扩展函数

    public static void AddDrag(this Control control)

    {

        if (_locationList.ContainsKey(control.Name)==false)

        {

            _locationList.Add(control.Name, new Point() );

            _isDownList.Add(control.Name, false);

　　　　　　　　
　　　　　　　　
            //按下鼠标

            control.MouseDown += (s, ev) =>

            {

                _isDownList[control.Name] = true;

                _locationList[control.Name] = new Point(ev.X, ev.Y);

            };

            //松开鼠标

            control.MouseUp += (s, ev) =>

            {

                _isDownList[control.Name] = false;

            };

            //鼠标移动

            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);

                }

            };

        }

    }

}

private void Form1_Load(object sender, EventArgs e)

{

//可以是任何控件

panel1.AddDrag();

//可以是任何控件
 label1.AddDrag(); 

}