C#生成二维码

引用thoughtworks.qrcode.dll

1、不带图片

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using ThoughtWorks.QRCode.Codec;

namespace makeQrcode
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }

        protected void createQrCode_Click(object sender, EventArgs e)
        {
            createQrCode(this.codeInfo.Text);
        }

        private void createQrCode(string text)
        {
            Bitmap bt;
            string enCodeString = text;
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            //bt = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8);
            bt = qrCodeEncoder.Encode(enCodeString);
            string filename = string.Format(DateTime.Now.ToString(), "yyyymmddhhmmss");
            filename = filename.Replace(" ", "");
            filename = filename.Replace(":", "");
            filename = filename.Replace("-", "");
            filename = filename.Replace(".", "");
            bt.Save(Server.MapPath("~/image/") + filename + ".jpg");
            this.qrCodeImage.ImageUrl = "~/image/" + filename + ".jpg";
        }

    }
}

2、带图片

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web;
using ThoughtWorks.QRCode.Codec;

namespace QRCode.QRCode
{
    /// <summary>
    /// qrcodeImg 的摘要说明
    /// </summary>
    public class qrcodeImg : IHttpHandler
    {
        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

        public void ProcessRequest(HttpContext context)
        {
            //context.Response.ContentType = "text/plain";
            //context.Response.Write("Hello World");
            string text = context.Request["CodeText"];
            string text2 = context.Request["img"];
            if (text2 == "" || text2 == null)
            {
                text2 = "../images/wm.png";
            }
            if (!string.IsNullOrEmpty(text))
            {
                QRCodeEncoder qRCodeEncoder = new QRCodeEncoder();
                //qRCodeEncoder.set_QRCodeEncodeMode(2);
                //qRCodeEncoder.set_QRCodeScale(4);
                //qRCodeEncoder.set_QRCodeVersion(8);
                //qRCodeEncoder.set_QRCodeErrorCorrect(1);
                qRCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
                qRCodeEncoder.QRCodeScale = 4;
                qRCodeEncoder.QRCodeVersion = 8;
                qRCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
                System.Drawing.Image image = qRCodeEncoder.Encode(text);
                MemoryStream memoryStream = new MemoryStream();
                image.Save(memoryStream, System.Drawing.Imaging.ImageFormat.Png);
                MemoryStream memoryStream2 = new MemoryStream();
                CombinImage(image, context.Server.MapPath(text2)).Save(memoryStream2, System.Drawing.Imaging.ImageFormat.Png);
                context.Response.ClearContent();
                context.Response.ContentType = "image/png";
                context.Response.BinaryWrite(memoryStream2.ToArray());
                memoryStream.Dispose();
                memoryStream2.Dispose();
            }
            context.Response.Flush();
            context.Response.End();
        }
        public static System.Drawing.Image CombinImage(System.Drawing.Image imgBack, string destImg)
        {
            System.Drawing.Image image = System.Drawing.Image.FromFile(destImg);
            if (image.Height != 65 || image.Width != 65)
            {
                image = KiResizeImage(image, 65, 65, 0);
            }
            System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(imgBack);
            graphics.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);
            graphics.DrawImage(image, imgBack.Width / 2 - image.Width / 2, imgBack.Width / 2 - image.Width / 2, image.Width, image.Height);
            GC.Collect();
            return imgBack;
        }
        public static System.Drawing.Image KiResizeImage(System.Drawing.Image bmp, int newW, int newH, int Mode)
        {
            System.Drawing.Image result;
            try
            {
                System.Drawing.Image image = new System.Drawing.Bitmap(newW, newH);
                System.Drawing.Graphics graphics = System.Drawing.Graphics.FromImage(image);
                graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
                graphics.DrawImage(bmp, new System.Drawing.Rectangle(0, 0, newW, newH), new System.Drawing.Rectangle(0, 0, bmp.Width, bmp.Height), System.Drawing.GraphicsUnit.Pixel);
                graphics.Dispose();
                result = image;
            }
            catch
            {
                result = null;
            }
            return result;
        }

    }
}

前端调用（一个简单的下载页面）：

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=0.5, maximum-scale=2.0, user-scalable=yes" />
    <title>下载</title>
    <style type="text/css">
        body
        {
            margin: 0;
            padding: 0;
            color: #333333;
            font-family: "微软雅黑";
            background: #f0f0f0;
        }
        .clear
        {
            clear: both;
        }                     
        .layout
        {
            width: 100%;
            background: #3d3f40;
            border-bottom: 1px solid #cccccc;
        }
        .layout .logo
        {
            max-width: 960px;
            height: 86px;
            margin: 0 auto;
            background: url(../images/plat_logo.png) 10px center no-repeat;
        }
        .center
        {
            background: #ffffff;
            border-top: 1px solid #222222;
        }
        .center .con
        {
            max-width: 960px;
            margin: 0 auto;
            padding: 40px 0;
        }
        .btn
        {
            width: 30%;
            margin-left: 10px;
            min-width: 296px;
            float: left;
            padding: 5px 5px;
            text-align: center;
        }       
        .btn a.ios
        {
            height: 200px;
            display: block;
            background: #4691dc url(../images/ios.png) center center no-repeat;
            margin: 0 auto;
        }
        .btn a.android
        {
            height: 200px;
            display: block;
            background: #a4c63e url(../images/android.png) center center no-repeat;
            margin: 0 auto;
        }             
    </style>
</head>
<body>
    <div class="layout">
        <div class="logo">
        </div>
        <div class="center">
            <div class="con">                        
                <div class="btn">
                    <a id="iphoneLink" href="#" class="ios"></a>
                </div>
                <div class="btn">
                    <a href="#" class="android"></a>
                </div>
                <div class="btn">
                    <img id="QrCodeImg" alt="" src="" />
                </div>
                <div class="clear">
                </div>
            </div>
        </div>
    </div>    
    <script type="text/javascript">      

        var hostname = location.hostname;
        var port = location.port;
        var page = "http://" + hostname + ":" + port + "/QRCode/install.html";
       
        document.getElementById("QrCodeImg").src = "qrcodeImg.ashx?CodeText=" + page;        
    </script>
</body>
</html>