ASP.NET验证码制作

本文实例为大家分享了ASP.NET验证码的具体代码，供大家参考，具体内容如下

我主要是看到干扰线了，一个验证码里面要是没有干扰线什么的，至少得在噪点和随机码的排版上下工夫：

 /// 

 /// 验证码生成类
 /// 
 public class verify_code : IHttpHandler, IRequiresSessionState
 {
  public void ProcessRequest(HttpContext context)
  {
   int codeW = 80;
   int codeH = 22;
   int fOntSize= 16;
   string chkCode = string.Empty;
   //颜色列表，用于验证码、噪线、噪点 
   Color[] color = { Color.Black, Color.Red, Color.Blue, Color.Green, Color.Orange, Color.Brown, Color.Brown, Color.DarkBlue };
   //字体列表，用于验证码 
   string[] fOnt= { "Times New Roman", "Verdana", "Arial", "Gungsuh", "Impact" };
   //验证码的字符集，去掉了一些容易混淆的字符 
   char[] character = { &＃39;0&＃39;, &＃39;1&＃39;, &＃39;2&＃39;, &＃39;3&＃39;, &＃39;4&＃39;, &＃39;5&＃39;, &＃39;6&＃39;, &＃39;8&＃39;, &＃39;9&＃39; };
   Random rnd = new Random();
   //生成验证码字符串 
   for (int i = 0; i <4; i++)
   {
    chkCode += character[rnd.Next(character.Length)];
   }
   //写入Session
   context.Session["sys_verify_code"] = chkCode;
   //创建画布
   Bitmap bmp = new Bitmap(codeW, codeH);
   Graphics g = Graphics.FromImage(bmp);
   g.Clear(Color.White);
   //画噪线 
   for (int i = 0; i <4; i++)
   {
    int x1 = rnd.Next(codeW);
    int y1 = rnd.Next(codeH);
    int x2 = rnd.Next(codeW);
    int y2 = rnd.Next(codeH);
    Color clr = color[rnd.Next(color.Length)];
    g.DrawLine(new Pen(clr), x1, y1, x2, y2);
   }
   //画验证码字符串 
   for (int i = 0; i 
基本验证生成代码demo：

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Web;

public partial class image : System.Web.UI.Page
{
 protected void Page_Load(object sender, EventArgs e)
 {
  string tmp = RndNum(4);
  HttpCOOKIE a = new HttpCOOKIE("ImageV", tmp);
  Response.COOKIEs.Add(a);
  this.ValidateCode(tmp);
 }

 private void ValidateCode(string VNum)
 {
  Bitmap Img = null;
  Graphics g = null;
  MemoryStream ms = null;
  int gheight = VNum.Length * 12;
  Img = new Bitmap(gheight, 25);
  g = Graphics.FromImage(Img);
  //背景颜色
  g.Clear(Color.White);
  //文字字体
  Font f = new Font("Arial Black", 10);
  //文字颜色
  SolidBrush s = new SolidBrush(Color.Black);
  g.DrawString(VNum, f, s, 3, 3);
  ms = new MemoryStream();
  Img.Save(ms, ImageFormat.Jpeg);
  Response.ClearContent();
  Response.COntentType= "image/Jpeg";
  Response.BinaryWrite(ms.ToArray());

  g.Dispose();
  Img.Dispose();
  Response.End();
 }

 private string RndNum(int VcodeNum)
 {
  string Vchar = "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";
  string[] VcArray = Vchar.Split(new Char[] { &＃39;,&＃39; });
  string VNum = "";
  int temp = -1;

  Random rand = new Random();

  for (int i = 1; i 
以上就是ASP.NET验证码制作的详细内容，更多请关注其它相关文章！