关于生成验证码的源码以及问题解决

2024-07-21 02:28:19

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在网上找了一个验证码的源代码，使用后出现如下问题：不管你输入正确与否，都会提示验证码错误。后来经过在qq群里和csdn发贴咨询，得知是ie浏览器缓存问题。在经过他人的指点后改正了错误。源代码如下：

-------------------validate.aspx------------------

<%@ page language="c#" %>
<%@ import namespace="system"%>
<%@ import namespace="system.io"%>
<%@ import namespace="system.drawing"%>
<%@ import namespace="system.drawing.imaging"%>
<%@ import namespace="system.drawing.drawing2d"%>

string 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'};
string num = "";
random r = new random();
for(int i = 0; i < 5; i++)
{
num += s[r.next(0, s.length)].tostring();
}
return num;
}
</script>

-----------------------register.aspx------------

<%@ page language="c#" autoeventwireup="true" codefile="register.aspx.cs" inherits="myregister.register" %>

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>会员注册</title>
    <link href="stylesheet.css" _fcksavedurl=""stylesheet.css"" _fcksavedurl=""stylesheet.css"" _fcksavedurl=""stylesheet.css"" type="text/css" rel="stylesheet">
</head>
<body>
    <form id="form1" runat="server">
    <div class="middle" >
    <div >
        <asp:label id="username" runat="server" text="用户名：" ></asp:label>
        <asp:textbox id="textbox1" runat="server"></asp:textbox>
    </div>
    <div >
        <asp:label id="userpsw" runat="server" text="密码：" ></asp:label>
        <asp:textbox id="textbox2" runat="server"></asp:textbox></div>
    <div >
        <asp:label id="label2" runat="server" text="确认密码：" ></asp:label>
        <asp:textbox id="textbox6" runat="server"></asp:textbox></div>
    <div >
        <asp:label id="question" runat="server" text="找回密码问题："></asp:label>
        <asp:textbox id="textbox3" runat="server"></asp:textbox></div>
    <div>
        <asp:label id="answer" runat="server" text="找回密码答案："></asp:label>
        <asp:textbox id="textbox4" runat="server"></asp:textbox></div>
    <div >
        <asp:label id="email" runat="server" text="电子邮件："></asp:label>
        <asp:textbox id="textbox5" runat="server"></asp:textbox></div>
    <div >
        <asp:label id="label1" runat="server" text="验证码："></asp:label>
        <asp:textbox id="checkcode" runat="server" width="85px"></asp:textbox>
        <asp:image id="image1" runat="server" imageurl="validate.aspx"></asp:image></div>
    <div>
        <asp:button id="button1" runat="server" text="确定" onclick="button1_click" /></div>
    <div class="text">
        <asp:label id="message" runat="server" ></asp:label></div>
    </div>
    </form>
</body>
</html>
-------------------------register.aspx.cs-------------------

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;
namespace myregister
{
    public partial class register : system.web.ui.page
    {
        protected void page_load(object sender, eventargs e)
        {

        }
        protected void button1_click(object sender, eventargs e)
        {
            string checkcode = checkcode.text;
            //response.write(session["vnum"]);
            if (checkcode == session["vnum"].tostring() || session["vnum"].tostring()==null)//注意session["vnum"].tostring()，必须加上tostring()，因//为session["vnum"]是对象。
            response.redirect ("default.aspx");
            else
            message.text = "验证码错误或为空！";
        }
    }
}
---------------------------------

其中注释的地方应特别注意

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