c#驗證碼

標籤：

 private void pictureBox1_Click(object sender, EventArgs e)        {                        Random r = new Random();            string str = null;            for (int i = 0; i < 6; i++)            {                int rnumber = r.Next(0, 10);                str += rnumber;            }            //建立GDI對象            Bitmap bmp = new Bitmap(120, 25);            Graphics g = Graphics.FromImage(bmp);            for (int i = 0; i < 6; i++)            {                Point p = new Point(i * 15, 0);                string[] Fonts = { "隸書", "仿宋", "華文行楷", "宋體", "微軟雅黑" };                Color[] colors = { Color.Red, Color.Black, Color.Blue, Color.DeepPink, Color.DimGray };                g.DrawString(str[i].ToString(), new Font(Fonts[r.Next(0, 5)], 15, FontStyle.Bold), new SolidBrush(colors[r.Next(0, 5)]), p);                 }            for (int i = 0; i < 15; i++)            {                 Point p1=new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));                 Point p2=new Point(r.Next(0,bmp.Width),r.Next(0,bmp.Height));                 g.DrawLine(new Pen(Brushes.Green), p1, p2);            }            for (int i = 0; i <= 200; i++)            {                Point p1 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));                Point p2 = new Point(r.Next(0, bmp.Width), r.Next(0, bmp.Height));                bmp.SetPixel(p1.X,p1.Y,Color.Black);            }                pictureBox1.Image = bmp;        }         

 

c#驗證碼