https://images.downcodes.comidentifyingcode.aspx里没有内容略。
id***ifyingcode.cs文件:
using System;
using Sy***m.Data;
using Sy***m.Configuration;
using Sy***m.Collections;
using Sy***m.Web;
using Sy***m.Web.Security;
using Sy***m.Web.UI;
using Sy***m.Web.UI.WebControls;
using Sy***m.Web.UI.WebControls.WebParts;
using Sy***m.Web.UI.HtmlControls;
using Sy***m.Drawing;
using Sy***m.Drawing.Imaging;
using Sy***m.IO;
public partial class identifyingcode : Sy***m.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
string tmp = RndNum(4);
HttpCookie a = new HttpCookie("ImageV", tmp);
Re***nse.Cookies.Add(a);
th***ValidateCode(tmp);
}
private void ValidateCode(string VNum)
{
Bitmap Img = null;
Graphics g = null;
MemoryStream ms = null;
int gheight = VN***Length * 12;
Img = new Bitmap(gheight, 25);
g = Gr***ics.FromImage(Img);
//背景颜色
g.Clear(Co***.LightSteelBlue);
//文字字体
Font f = new Font("Arial Black", 10);
//文字颜色
SolidBrush s = new SolidBrush(Co***.RoyalBlue);
g.***wString(VNum, f, s, 3, 3);
ms = new MemoryStream();
Img.Save(ms, Im***Format.Jpeg);
Re***nse.ClearContent();
Re***nse.ContentType = "images/Jpeg";
Re***nse.BinaryWrite(ms***Array());
g.***pose();
Img.***pose();
Re***nse.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 = Vc***.Split(new Char[] { ',' });
string VNum = "";
int temp = -1;
Random rand = new Random();
for (int i = 1; i < VcodeNum + 1; i++)
{
if (temp != -1)
{
rand = new Random(i * temp * unchecked((int)Da***ime.Now.Ticks));
}
int t = ra***Next(35);
if (temp != -1 && temp == t)
{
return RndNum(VcodeNum);
}
temp = t;
VNum += VcArray[t];
}
return VNum;
}
}
使用方法:
在需要它的页面html里添加
HttpCookieCollection cookies = Re***st.Cookies;
string tmp = cookies["ImageV"].Value;
然后比tmp与获取的较验证码文本框中的值是否相同
出处:http://enuosky.cnblogs.com/archive/2006/05/15/400954.html