验证码生成

/*产生验证码*/ public string CreateCode(int codeLength) { string so = "1,2,3,4,5,6,7,8,9,0,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z"; string[] strArr=so.Split(','); string code = ""; Random rand=new Random(); for (int i = 0; i < codeLength; i++) { code+=strArr[rand.Next(0, strArr.Length)]; } return code; } /*产生验证图片*/ public void CreateImage(string code) { Bitmap image = new Bitmap(60, 20); Graphics g = Graphics.FromImage(image); WebColorConverter ww=new WebColorConverter(); g.Clear((Color)ww.ConvertFromString("#FAE264")); Random random = new Random(); //画图片的背景噪音线 for (int i = 0; i < 12; i++) { int x1 = random.Next(image.Width); int x2 = random.Next(image.Width); int y1 = random.Next(image.Height); int y2 = random.Next(image.Height); g.DrawLine(new Pen(Color.LightGray), x1, y1, x2, y2); } Font font = new Font("Arial", 15, FontStyle.Bold | FontStyle.Italic); System.Drawing.Drawing2D.LinearGradientBrush brush = new System.Drawing.Drawing2D.LinearGradientBrush( new Rectangle(0,0,image.Width,image.Height),Color.Blue,Color.Gray,1.2f,true); g.DrawString(code, font, brush, 0, 0); //画图片的前景噪音点 //for (int i = 0; i < 10; i++) //{ // int x = random.Next(image.Width); // int y = random.Next(image.Height); // image.SetPixel(x, y, Color.White); //} //画图片的边框线 // g.DrawRectangle(new Pen(Color.Silver), 0, 0, image.Width - 1, image.Height - 1); System.IO.MemoryStream ms = new System.IO.MemoryStream(); image.Save(ms, System.Drawing.Imaging.ImageFormat.Gif); Response.ClearContent(); Response.ContentType = "image/Gif"; Response.BinaryWrite(ms.ToArray()); g.Dispose(); image.Dispose(); }