C#實現窗體拖動、不允許窗體拖動、任意控制元件執行時拖動

1、不允許窗體被拖動。即使點選藍色標題條。

       程式碼片段,加入不想被拖動的窗體中即可

        protectedoverridevoid WndProc(refMessage m)

        {

            base.WndProc(ref m);

            if (m.Msg == 0x84)

            {

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

                {

                    m.Result = (IntPtr)1;

                }

            }

        }

2、使用API函式，拖動窗體的任意地方，使得窗體被拖動

         程式碼片段如下,開放Form1_MouseDown事件。

using System.Runtime.InteropServices;

        [DllImport("user32.dll")]

        publicstaticexternbool ReleaseCapture();

        [DllImport("user32.dll")]

        publicstaticexternbool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

        publicconstint WM_SYSCOMMAND = 0x0112;

        publicconstint SC_MOVE = 0xF010;

        publicconstint HTCAPTION = 0x0002;

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

        {

            ReleaseCapture();

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

   }

3、利用APi函式，實現任意控制元件的拖動。

      程式碼片段如下，掛上要被拖動的控制元件的MouseDown事件即可

using System.Runtime.InteropServices;

      

constuint WM_SYSCOMMAND = 0x0112;

        constuint SC_MOVE = 0xF010;

        constuint HTCAPTION = 0x0002;

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

        privatestaticexternint SendMessage(IntPtr hwnd, uint wMsg, uint wParam, uint lParam);

        [DllImport("user32.dll")]

        privatestaticexternint ReleaseCapture();

        void PictureBox1MouseDown(object sender, MouseEventArgs e)

        {

            ReleaseCapture();

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

   }