WinForm a custom form

  Public partial class Form3:form {const int wm_nchittest = 0x0084;        const int ht_left = 10;        const int ht_right = 11;        const int ht_top = 12;        const int ht_topleft = 13;        const int ht_topright = 14;        const int ht_bottom = 15;        const int ht_bottomleft = 16;        const int ht_bottomright = 17;        const int ht_caption = 2;            Public Form3 () {InitializeComponent (); Rectregion = new System.Drawing.Rectangle (0, 0, this. Width, this.            Height);        Setwindowregion ();        } private System.Drawing.Rectangle rectregion;        private static int x, y = 0;            public void Setwindowregion () {System.Drawing.Drawing2D.GraphicsPath formpath;            Formpath = new System.Drawing.Drawing2D.GraphicsPath (); System.Drawing.Rectangle rect = new System.Drawing.Rectangle (0, 0, this. Width, this.            Height);           Formpath = Getroundedrectpath (rect,10); This.        Region = new Region (Formpath);            } protected override void OnPaint (PaintEventArgs e) {Graphics g = e.graphics;            System.Drawing.Drawing2D.GraphicsPath Formpath; System.Drawing.Rectangle rect = new System.Drawing.Rectangle (0, 0, this. Width, this.            Height);            Formpath = Getroundedrectpath (rect, 10);            Pen mypen = new Pen (Color.gray, 2);            G.drawpath (Mypen, Formpath); Base.        OnPaint (e); } private GraphicsPath Getroundedrectpath (System.Drawing.Rectangle rect, int radius) {int Diamet            er = radius; System.Drawing.Rectangle arcrect = new System.Drawing.Rectangle (rect.            Location, new Size (diameter, diameter));            GraphicsPath path = new GraphicsPath (); The upper-left corner of path.            AddArc (Arcrect, 180, 90); upper right corner arcrect.x = rect.            Right-diameter; Path.            AddArc (Arcrect, 270, 90); lower right corner Arcrect.y = rEct.            Bottom-diameter; Path.            AddArc (arcrect, 0, 90); lower left corner arcrect.x = rect.            Left; Path.            AddArc (Arcrect, 90, 90); Path.        Closefigure ();//closed curve return path;                } protected override void WndProc (ref Message MSG) {if (msg.msg = = wm_nchittest) {                Get mouse position int nposx = (Msg.LParam.ToInt32 () & 65535);                int nposy = (Msg.LParam.ToInt32 () >> 16); Lower right corner if (nposx >= this. Right-6 && Nposy >= this.                    Bottom-6) {Msg.result = new IntPtr (ht_bottomright);                Return }//upper left corner else if (nposx <= this. Left + 6 && nposy <= this.                    Top + 6) {Msg.result = new IntPtr (ht_topleft);                Return }//lower left corner else if (nposx &LT;= this. Left + 6 && nposy >= this.                    Bottom-6) {Msg.result = new IntPtr (ht_bottomleft);                Return }//upper right corner else if (nposx >= this. Right-6 && Nposy <= this.                    Top + 6) {Msg.result = new IntPtr (ht_topright);                Return } else if (Nposx >= this.                    Right-2) {Msg.result = new IntPtr (ht_right);                Return } else if (Nposy >= this.                    Bottom-2) {Msg.result = new IntPtr (ht_bottom);                Return } else if (Nposx <= this.                    Left + 2) {Msg.result = new IntPtr (ht_left);                Return } else if (Nposy <= this. Top + 2) {Msg.result = new IntPtr (ht_top);                Return                    } else {msg.result = new IntPtr (ht_caption);                Return }} base.        WndProc (ref MSG); } private void Form3_resize (object sender, EventArgs e) {SetStyle (controlstyles.supportstranspar            Entbackcolor, True);            SetStyle (Controlstyles.allpaintinginwmpaint, true);            SetStyle (Controlstyles.userpaint, true);            SetStyle (Controlstyles.doublebuffer, true); This.            Refresh ();        Setwindowregion (); private void btnClose_Click (object sender, EventArgs e) {this.        Close (); private void Btnmax_click (object sender, EventArgs e) {this.            MaximumSize = new Size (Screen.PrimaryScreen.WorkingArea.Width, Screen.PrimaryScreen.WorkingArea.Height); This.      WindowState = formwindowstate.maximized;  private void Btnmin_click (object sender, EventArgs e) {this.            MinimumSize = new Size (rectregion.width, rectregion.height); This.        WindowState = Formwindowstate.normal;            private void Panel1_mousedown (object sender, MouseEventArgs e) {x = e.x-1;        y = e.y-1; private void Panel1_mousemove (object sender, MouseEventArgs e) {if (E.button = = MOUSEBUTTONS.L EFT) {this.                left = Cursor.position.x-x; This.            Top = cursor.position.y-y; }        }    }

Demo <a target=_blank href= "http://download.csdn.net/detail/u011470119/7589233" >http://download.csdn.net/ Detail/u011470119/7589233</a>