C # winform application programming code Summary 1

1. Gradient form

Set a timer interval to 100 and add it to the response function.

        private void Form1_Load(object sender, System.EventArgs e)        {            this.timer1.Enabled=true;            this.Opacity=0;        }        private void timer1_Tick(object sender, System.EventArgs e)        {            if(this.Opacity<1)            {                this.Opacity=this.Opacity+0.05;            }            else            {                this.timer1.Enabled=false;            }        }

2. Set the top-level window

Set topmost and toplevel to true!

3. Set a Polygon Window.

Introduce the function to be used

[DllImport("gdi32")]private static extern IntPtr CreatePolygonRgn(Point[] lpPoint,int nCount,int nPolyFillMode);[DllImport("user32")]private static extern IntPtr SetWindowRgn(IntPtr hWnd,IntPtr hRgn,bool bRedraw);

 

Set the shape when loading the window!

            Point[] pt={                            new Point(this.Width /2,0),                            new Point(0,this.Height/2),                            new Point(this.Width/2,this.Height),                            new Point(this.Width,this.Height/2),                            new Point(this.Width,0)                        };                        IntPtr m_rgn;            m_rgn=CreatePolygonRgn(pt,5,WINDING);            SetWindowRgn(this.Handle,m_rgn,true);

4. Set a circular window

[System. runtime. interopservices. dllimport ("GDI32")] Private Static extern intptr beginpath (intptr HDC); [system. runtime. interopservices. dllimport ("GDI32")] Private Static extern int setbkmode (intptr HDC, int nbkmode); const int transparent = 1; [system. runtime. interopservices. dllimport ("GDI32")] Private Static extern intptr endpath (intptr HDC); [system. runtime. interopservices. dllimport ("GDI32")] Private Static extern intptr pathtoregion (intptr HDC); [system. runtime. interopservices. dllimport ("GDI32")] Private Static extern int ellipse (intptr HDC, int X1, int Y1, int X2, int Y2); [system. runtime. interopservices. dllimport ("USER32")] Private Static extern intptr set1_wrgn (intptr hwnd, intptr hrgn, bool bredraw); [system. runtime. interopservices. dllimport ("USER32")] Private Static extern intptr getdc (intptr hwnd); Private void form1_load (Object sender, system. eventargs e) {intptr DC; intptr region; DC = getdc (this. handle); beginpath (DC); // create an irregular form setbkmode (DC, transparent) based on the path; // set it to transparent mode ellipse (DC, 20, 20, 220,220 ); endpath (DC); region = pathtoregion (DC); set1_wrgn (this. handle, region, true);} const int wm_nchittest = 0x0084; const int htclient = 0x0001; const int htcaption = 0x0002; protected override void wndproc (Ref system. windows. forms. message m) {Switch (M. MSG) {Case wm_nchittest: base. wndproc (ref m); If (M. result = (intptr) htclient) M. result = (intptr) htcaption; break; default: base. wndproc (ref m); break ;}}}

5. Gradient window background

      private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)     {            Graphics g=e.Graphics;            Color FColor=Color.Blue;            Color TColor=Color.Yellow;            Brush b =new LinearGradientBrush(this.ClientRectangle, FColor, TColor, LinearGradientMode.ForwardDiagonal);            g.FillRectangle(b,this.ClientRectangle);      }      private void Form1_Resize(object sender, System.EventArgs e)      {            this.Invalidate();      }

 

6. Drag the Untitled window

        [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);         }

This series of articles is the author's learning about Visual C #. NET application programming 150 cases (source code) experience notes, welcome to reprint, please indicate the original address, if you have any questions, you can contact the author through the 278250658@qq.com.

Author: ryanding