Windows裡有游標的API函數

        //建立游標
        [DllImport("user32.dll")]
        static extern bool CreateCaret(IntPtr hWnd, IntPtr hBitmap,int nWidth,int nHeight);

        //顯示光線標
        [DllImport("user32.dll")]
        static extern bool ShowCaret(IntPtr hWnd);

        //隱藏游標
        [DllImport("user32.dll")]
        static extern bool HideCaret(IntPtr hWnd);

        //設定游標位置
        [DllImport("user32.dll")]
        static extern bool SetCaretPos(int X,int Y);
       
        //獲得輸入焦點
        [DllImport("user32.dll")]
        static extern IntPtr SetFocus(IntPtr hWnd);
     
      //例子：Panel的滑鼠釋放事件裡
       void panel1_MouseUp(object sender, MouseEventArgs e)
        {
            CreateCaret(panel1.Handle, (IntPtr)null, 1, 16);
            SetCaretPos(e.X, e.Y-16/2);
            ShowCaret(panel1.Handle);
            SetFocus(panel1.Handle);
        }