关于拖动（实现窗体拖动、不允许窗体拖动、任意控件运行时拖动）

1、不允许窗体被拖动。即使点击蓝色标题条。

       代码片段,加入不想被拖动的窗体中即可

        protected override void WndProc(ref Message m)

        {

            base.WndProc(ref m);

            if (m.Msg == 0x84)

            {

                if ((IntPtr)2 == m.Result)

                {

                    m.Result = (IntPtr)1;

                }

            }

        }

2、使用API函数，拖动窗体的任意地方，使得窗体被拖动

         代码片段如下,开放Form1_MouseDown事件。

using System.Runtime.InteropServices;

        [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;

        private void Form1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)

        {

            ReleaseCapture();

            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);

   }

3、利用APi函数，实现任意控件的拖动。

      代码片段如下，挂上要被拖动的控件的MouseDown事件即可

using System.Runtime.InteropServices;

const uint WM_SYSCOMMAND = 0x0112;

        const uint SC_MOVE = 0xF010;

        const uint HTCAPTION = 0x0002;

        [DllImport("user32.dll", EntryPoint = "SendMessageA")]

        private static extern int SendMessage(IntPtr hwnd, uint wMsg, uint wParam, uint lParam);

        [DllImport("user32.dll")]

        private static extern int ReleaseCapture();

        void PictureBox1MouseDown(object sender, MouseEventArgs e)

        {

            ReleaseCapture();

            SendMessage((sender as Control).Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);

   }