原始出处:http://www.wrclub.net/show.aspx?id=1525
#region 实现一个验证码的类
public class ValidateCode { private Bitmap validateimage; private Graphics g; public ValidateCode() { validateimage = new Bitmap(120, 30, PixelFormat.Format24bppRgb); g = Graphics.FromImage(validateimage); }
public void DrawValidateCode(Page e, string i) { g.DrawString(i, new Font("黑体",16,FontStyle.Bold),new SolidBrush(Color.White),new PointF(2,4)); g.FillRectangle(new LinearGradientBrush(new Point(0,0), new Point(120,30), Color.FromArgb(0,0,0,0),Color.FromArgb(255,255,255,255)),0,0,120,30); //validateimage.Save(e.OutputStream, ImageFormat.Jpeg); g.Save(); MemoryStream ms=new MemoryStream(); validateimage.Save(ms,System.Drawing.Imaging.ImageFormat.Gif); e.Response.ClearContent(); e.Response.ContentType="image/gif"; e.Response.BinaryWrite(ms.ToArray()); e.Response.End(); //validateimage.Save(e.MapPath("NumImage/ValidateImage.gif"), ImageFormat.Gif); //e.End(); } }
#endregion
private void MakeValidateCode() { char[] s = new char[]{''''0'''',''''1'''', ''''2'''',''''3'''',''''4'''',''''5'''',''''6'''',''''7'''',''''8'''',''''9'''',''''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 num = ""; Random r = new Random(); for(int i = 0; i < 5; i++) { num += s[r.Next(0, s.Length)].ToString(); } ((LoginUserInfo)Session["LoginUserInfo"]).ValidateNum = num; TextBox3.Text = ""; }
也综合了别人的一部分代码。:)
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