asp.net无刷新验证码

来源：互联网发布：流量打电话软件编辑：程序博客网时间：2024/06/08 21:18

其他页面调用前台示例代码

<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>

        <asp:UpdatePanel ID="UpdatePanel1" runat="server">
            <ContentTemplate>

<%-- <asp:ImageButton ID="ImageButton1" ImageUrl="/CheckCode.aspx" runat="server" /> --%>

</ContentTemplate>
</asp:UpdatePanel>

验证码页面

前台无内容

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="CheckCode.aspx.cs" Inherits="CheckCode" %>

<!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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>

    </div>
    </form>
</body>
</html>

后台代码:

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.IO;
using Onsc.Common;
using System.Text;

/// <summary>
/// 后台登陆验证码
/// </summary>
public partial class CheckCode : System.Web.UI.Page
{
    /// <summary>
    /// Page_Load
    /// </summary>
    /// <param name="sender"></param>
    /// <param name="e"></param>
    protected void Page_Load(object sender, EventArgs e)
    {
        Response.BufferOutput = true;
        Response.Cache.SetExpires(DateTime.Now.AddMilliseconds(-1));
        Response.Cache.SetCacheability(HttpCacheability.NoCache);
        Response.AppendHeader(" Pragma", "No-Cache");

        //生成验证码
        VerifCode vcode;
        string id = Request.QueryString["ID"];
        if (id == null)
        {
            vcode = new VerifCode();
        }
        else
        {
            if (PublicTools.IsIntStr(id))
            {
                vcode = new VerifCode(id);
            }
            else
            {
                throw new Exception("验证码参数错误！");
            }
        }

//将验证码保存到session中
Session["VERIF_CODE"] = vcode.Text;

        //向页面返回图片
        Bitmap codeImg = vcode.Image;
        MemoryStream ms = new MemoryStream();
        codeImg.Save(ms, System.Drawing.Imaging.ImageFormat.Gif);
        Response.BinaryWrite(ms.ToArray());
        Response.End();

}
}

参考：http://bbs.csdn.net/topics/330043189

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