C# 無邊框窗口實現拖動

原文地址：http://blog.csdn.net/sky___ice/article/details/11533321

Form1.Designer.cs：

//

//Form1

//

            this.MouseDown += new System.Windows.Forms.MouseEventHandler(Form_MouseDown);
            this.MouseMove += new System.Windows.Forms.MouseEventHandler(Form_MouseMove);
            this.MouseUp += new System.Windows.Forms.MouseEventHandler(Form_MouseUp);

Form1.cs

        #region 無邊框窗體拖動
        //-------------------無邊框窗體拖動---------------------------
        Point mouseOff;//鼠標移動位置變量
        bool leftFlag;//標籤是否爲左鍵
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mouseOff = new Point(-e.X, -e.Y); //得到變量的值
                leftFlag = true;                  //點擊左鍵按下時標註爲true;
            }
        }
        private void Form_MouseMove(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                Point mouseSet = Control.MousePosition;
                mouseSet.Offset(mouseOff.X, mouseOff.Y);  //設置移動後的位置
                (((System.Windows.Forms.PictureBox)sender).Parent).Location = mouseSet;
            }
        }
        private void Form_MouseUp(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                leftFlag = false;//釋放鼠標後標註爲false;
            }
        }

        [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 Form_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            ReleaseCapture();
            SendMessage(this.Handle, WM_SYSCOMMAND, SC_MOVE + HTCAPTION, 0);
        }
        //------------------------end 無邊框窗體拖動-----------------------------------
        #endregion