引用ThoughtWorks.QRCode.dll （源代码里有）
1、简单二维码生成及解码代码：
//生成二维码方法一private void CreateCode_Simple(string nr) { QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; qrCodeEncoder.QRCodeScale = 4; qrCodeEncoder.QRCodeVersion = 8; qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; //System.Drawing.Image image = qrCodeEncoder.Encode("4408810820 深圳－广州 小江"); System.Drawing.Image image = qrCodeEncoder.Encode(nr); string filename = DateTime.Now.ToString("yyyymmddhhmmssfff").ToString() + ".jpg"; string filepath = Server.MapPath(@"~\Upload") + "\\" + filename; System.IO.FileStream fs = new System.IO.FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write); image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg); fs.Close(); image.Dispose(); //二维码解码 var codeDecoder = CodeDecoder(filepath); } /// <summary> /// 二维码解码 /// </summary> /// <param name="filePath">图片路径</param> /// <returns></returns> public string CodeDecoder(string filePath) { if (!System.IO.File.Exists(filePath)) return null; Bitmap myBitmap = new Bitmap(Image.FromFile(filePath)); QRCodeDecoder decoder = new QRCodeDecoder(); string decodedString = decoder.decode(new QRCodeBitmapImage(myBitmap)); return decodedString; } 2、源代码演示，相对复杂的生成方式：
界面效果：
前端代码：
@{Layout = null;
}<!DOCTYPE html><html>
<head><meta name="viewport" content="width=device-width" /> <title>Code</title> <script src="~/Scripts/jquery-1.10.2.js"></script> <script type="text/javascript"> $(function () { $("#createCode").click(function () { var strData = $("#strData").val(); var level = $("#level").val(); var encoding = $("#encoding").val(); var version = $("#version").val(); var scale = $("#scale").val(); $.post("/home/CreateCode_Choose", { strData: strData, level: level, qrEncoding: encoding, version: version, scale: scale }, function (data) { $("img").attr("src", data); }); }); }); </script> </head> <body> <div> <p>要生成的文字(支持中文)：<input id="strData" type="text" value="123456 测试" /></p> <p> Encoding:<select id="encoding"> <option value="Byte">Byte</option> <option value="AlphaNumeric">AlphaNumeric</option> <option value="Numeric">Numeric</option> </select> </p> <p> Correction Level:<select id="level"> <option value="M">M</option> <option value="L">L</option> <option value="Q">Q</option> <option value="H">H</option> </select> </p> <p>Version:<input id="version" type="text" value="8" /></p> <p>scale:<input id="scale" type="text" value="4" /></p> <img src="" alt="" /> <input id="createCode" type="button" value="生成" /> </div> </body> </html> 后台：
/// 生成二维码/// </summary>/// <param name="strData">要生成的文字或者数字，支持中文。如： "4408810820 深圳－广州" 或者：4444444444</param> /// <param name="qrEncoding">三种尺寸：BYTE ，ALPHA_NUMERIC，NUMERIC</param> /// <param name="level">大小：L M Q H</param> /// <param name="version">版本：如 8</param> /// <param name="scale">比例：如 4</param> /// <returns></returns> public ActionResult CreateCode_Choose(string strData, string qrEncoding, string level, int version, int scale) { QRCodeEncoder qrCodeEncoder = new QRCodeEncoder(); string encoding = qrEncoding; switch (encoding) { case "Byte": qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; break; case "AlphaNumeric": qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC; break; case "Numeric": qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC; break; default: qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE; break; } qrCodeEncoder.QRCodeScale = scale; qrCodeEncoder.QRCodeVersion = version; switch (level) { case "L": qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L; break; case "M": qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M; break; case "Q": qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q; break; default: qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H; break; } //文字生成图片 Image image = qrCodeEncoder.Encode(strData); string filename = DateTime.Now.ToString("yyyymmddhhmmssfff").ToString() + ".jpg"; string filepath = Server.MapPath(@"~\Upload") + "\\" + filename; //如果文件夹不存在，则创建 //if (!Directory.Exists(filepath)) // Directory.CreateDirectory(filepath); System.IO.FileStream fs = new System.IO.FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write); image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg); fs.Close(); image.Dispose(); return Content(@"/Upload/" + filename); } 源代码演示下载：点击下载
