生成二维码

public class qr
{
    public qr()
    {
        //
        //TODO: 在此处添加构造函数逻辑
        //
    }
    /*
     bg  背景颜色    bg=颜色代码，例如：bg=ffffff
     fg  前景颜色    fg=颜色代码，例如：fg=cc0000
     gc  渐变颜色    gc=颜色代码，例如：gc=cc00000
     el  纠错等级    el可用值：hqml，例如：el=h
     w   尺寸大小    w=数值（像素），例如：w=300
     m   静区（外边距） m=数值（像素），例如：m=30
     pt  定位点颜色（外框）   pt=颜色代码，例如：pt=00ff00
     inpt    定位点颜色（内点）   inpt=颜色代码，例如：inpt=000000
     logo    logo图片  logo=图片地址，例如：logo=http://www.xxx.cn/logo.png
     */
    public const string api = "http://qr.liantu.com/api.php";

    public static string GenerationCard(string name, string tel, string email, string logo = "")
    {
        string RequestUrl = api;
        string macard = "MECARD:N:" + name + ";TEL:" + tel + ";EMATL；" + email + ";";
        RequestUrl += "?text=" + macard;
        if (logo != "")
        {
            RequestUrl += "&logo=" + logo;
        }
        return RequestUrl;
    }
}

生成二维码后台

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net;
using System.IO;
using System.Drawing.Imaging;

public partial class creatCode : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            try
            {
                string url = qr.GenerationCard(Request["name"], Request["tel"], Request["email"]);
                WebRequest wreq = WebRequest.Create(url);
                HttpWebResponse wresp = (HttpWebResponse)wreq.GetResponse();
                Stream s = wresp.GetResponseStream();
                System.IO.MemoryStream ms = new MemoryStream();
                System.Drawing.Image img = System.Drawing.Image.FromStream(s);
                img.Save(ms, ImageFormat.Gif);
                Response.ClearContent();
                Response.ContentType = "image/Gif";
                Response.BinaryWrite(ms.ToArray());
                img.Dispose();
                s.Dispose();
            }
            catch (Exception ex)
            {
                
                throw;
            }
        }
    }
}

前台页面

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

调用页面

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>生成验证码(演示)</title>
</head>
<body>
    <form action="creatCode.aspx" id="form1">
    <label for="txtName">
        姓名：</label>
    <input type="text" name="txtName" /><br />
    <label for="tel">
        电话：
    </label>
    <input type="text" name="tel" /><br />
    <label for="email">
        邮箱：
    </label>
    <input type="text" name="email" /><br />
    <input type="submit" name="submit" value="生成验证码" />
    </form>
    <script type="text/javascript">
        form1.submit.onclick = function () {
            var name = form1.name.value;
            var tel = form1.tel.value;
            var email = form1.email.value;
            window.location.href = "/creatCode.aspx?name=" + name + "&tel=" + tel + "&email=" + email;
        }
    </script>
</body>
</html>