通过控件拖动窗体

using System;  using System.Collections.Generic;  using System.Text;  using System.Windows.Forms;  using System.Drawing;     namespace EW.XIS.Common  {      /// <summary>      /// <para>说明：窗体拖动类，通过这个类提供的方法实现窗体上任意控件可辅助拖动窗体</para>      /// </summary>      public class DragFormClass      {             private static bool isMouseDown = false;          private static Point mouseOffset;          private static Form _form;          /// <summary>          /// 在窗体上增加拖拽事件          /// </summary>          /// <param name="control">控件对象</param>          public static void bindControl(Control control)          {              //如果控件为空                 if (control == null)              {                  return;              }              _form = control.FindForm();              //增加鼠标拖动窗体移动事件                control.MouseMove += new MouseEventHandler(control_MouseMove);              control.MouseDown += new MouseEventHandler(control_MouseDown);              control.MouseUp += new MouseEventHandler(control_MouseUp);          }             /// <summary>          /// 鼠标按下之时，保存鼠标相对于窗体的位置          /// </summary>          /// <param name="sender"></param>          /// <param name="e"></param>          private static void control_MouseDown(object sender, MouseEventArgs e)          {              if (Control.MouseButtons == MouseButtons.Left)              {                     Point p=_form.PointToClient(Control.MousePosition);                  mouseOffset = new Point(-p.X, -p.Y);                  isMouseDown = true;              }          }          /// <summary>          /// 移动鼠标的时候改变窗体位置          /// </summary>          /// <param name="sender"></param>          /// <param name="e"></param>          private static void control_MouseMove(object sender, MouseEventArgs e)          {              if (Control.MouseButtons == MouseButtons.Left)              {                  if (isMouseDown)                  {                      Point mouse = Control.MousePosition;                      mouse.Offset(mouseOffset.X, mouseOffset.Y);                      _form.Location = new Point(mouse.X, mouse.Y);                                        }              }          }          /// <summary>          /// 松开鼠标的时候，重设事件          /// </summary>          /// <param name="sender"></param>          /// <param name="e"></param>          private static void control_MouseUp(object sender, MouseEventArgs e)          {              if (e.Button == MouseButtons.Left)              {                  isMouseDown = false;              }          }         }  }