验证码

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Validate.cs:

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using System;

using System.Collections;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Web;

using System.Web.SessionState;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.HtmlControls;

using System.IO;

using System.Drawing.Imaging;

namespace message

{

/// validate 的摘要说明。

public class validate : System.Web.UI.Page

{

private void Page_Load(object sender, System.EventArgs e)

{

// 在此处放置用户代码以初始化页面

string strNum=Rndnum();

Session["Num0"]=strNum;

ValidateCode(Session["Num0"].ToString());

}

#region Web 窗体设计器生成的代码

override protected void OnInit(EventArgs e)

{

// CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。

InitializeComponent();

base.OnInit(e);

}

/// <summary>

/// 设计器支持所需的方法 - 不要使用代码编辑器修改

/// 此方法的内容。

/// </summary>

private void InitializeComponent()

{

this.Load += new System.EventHandler(this.Page_Load);

}

#endregion

public string Rndnum()

{

int j1;

string strChoice="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 [] strResult = strChoice.Split(new Char [] {','});

string strReturn="";

Random rnd = new Random(unchecked((int)DateTime.Now.Ticks));

for(int i=0;i<4;i++)

{

Random rnd1=new Random(rnd.Next()*unchecked ((int)DateTime.Now.Ticks));

j1=rnd1.Next(35);

rnd=new Random (rnd.Next()*unchecked((int)DateTime.Now.Ticks));

strReturn=strReturn + strResult[j1].ToString();

}

return strReturn;

}

public void ValidateCode(string vnum)

{

MemoryStream ms=new MemoryStream();

double Height=(vnum.Length)*12;

int gHeight=Convert.ToInt32(Height);

Bitmap img=new Bitmap(gHeight,20);

Graphics g=Graphics.FromImage(img);

g.DrawString(vnum,(new Font ("幼圆",12)),(new SolidBrush(Color.Red)),1,4);

img.Save(ms,ImageFormat.Png);

Response.ClearContent();

Response.ContentType="image/Bmp";

Response.BinaryWrite(ms.ToArray());

g.Dispose();

img.Dispose();

Response.End();

}

调用方法：用image图象联接上就可以了ImageUrl="validate.aspx"

验证验证码是否相同：

private void txtvalidate_TextChanged(object sender, System.EventArgs e)

{

if(this.txtvalidate.Text==(string)Session["Num0"])

{

}

else

{

Response.Write("<script Language = 'javascript'>alert('验证码错误！');;window.location.replace('login_userinfo_add.aspx');</script>");

}