c# 实现窗体移动

一般情况下：

1.添加下列代码到你的窗体中：
  #region 轻松移动

bool isInMove;
  Point oldPoint;

  void InitializeEasyMove()
  {
   isInMove = false;

   this.MouseDown += new MouseEventHandler(EasyMove_MouseDown);
   this.MouseUp += new MouseEventHandler(EasyMove_MouseUp);
   this.MouseMove += new MouseEventHandler(EasyMove_MouseMove);
  }

  void EasyMove_MouseMove(object sender, MouseEventArgs e)
  {
   if (!isInMove) return;
   Point pt = PointToScreen(e.Location);
   if (pt.X == oldPoint.X || pt.Y == oldPoint.Y) return;
   this.Location = new Point(this.Location.X + pt.X - oldPoint.X, this.Location.Y + pt.Y - oldPoint.Y);
   oldPoint = pt;
  }

  void EasyMove_MouseUp(object sender, MouseEventArgs e)
  {
   isInMove = false;
  }

  void EasyMove_MouseDown(object sender, MouseEventArgs e)
  {
   isInMove = true;
   oldPoint = PointToScreen(e.Location);
  }

  #endregion

2.在你的窗体的构造函数或Load事件中调用：
InitializeEasyMove();

但是你会发现这样很麻烦，运行时也容易出错。

改进一：

增加mouseleave事件，当mouseleave的时候把isInMove 设置成false

这样虽然改进了一点。但是还有有点别扭

改进二：

使用win32api

public partial class Form6 : Form
    {
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;
        
        public Form6()
        {
            InitializeComponent();
        }

        private void Form6_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }
    }

代码量大大减少，直接消除鼠标移快速移动时出现bug的现象。但是当鼠标点击pannel，groupbox等还是没有反应

改进三：

public partial class Form1 : Form
    {
        [DllImport("user32.dll")]
        public static extern bool ReleaseCapture();
        [DllImport("user32.dll")]
        public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);
        public const int WM_SYSCOMMAND = 0x0112;
        public const int SC_MOVE = 0xF010;
        public const int HTCAPTION = 0x0002;
        public Form1()
        {
            InitializeComponent();
            foreach (var item in this.Controls)
            {
                if ((item as GroupBox) != null)
                {
                    (item as GroupBox).MouseDown += Form6_MouseDown;
                }
                else if ((item as Panel) != null)
                {
                    (item as Panel).MouseDown += Form6_MouseDown;
                }
            }
        }

        private void Form6_MouseDown(object sender, MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }
    }

将GroupBox ，pannel等控件添加mousedown动作

ok，大功告成