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The author:(作者)delvpublished in(发表于) 2014/1/6 8:49:08 asp.net,生成图片验证码_[Asp.Net教程]
identifyingcode.aspx里没有内容略。identifyingcode.cs文件:using System;using System.Data;using System.Configuration;using System.Collections;using System.Web;using System.Web.Security;using System.Web.UI;using System.Web.UI.WebControls;using System.Web.UI.WebControls.WebParts;using System.Web.UI.HtmlControls;using System.Drawing;using System.Drawing.Imaging;using System.IO;public partial class identifyingcode : 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.LightSteelBlue); //文字字体 Font f = new Font("Arial Black", 10); //文字颜色 SolidBrush s = new SolidBrush(Color.RoyalBlue); g.DrawString(VNum, f, s, 3, 3); ms = new MemoryStream(); Img.Save(ms, ImageFormat.Jpeg); Response.ClearContent(); Response.ContentType = "images/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[] { ',' }); 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)DateTime.Now.Ticks)); }
int t = rand.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 = Request.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
来源:网络
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