生成二维码

1.到网上下载 ThoughtWorks.QRCode.dll 到桌面（其他路径也可以，只要你自己知道就行），不用担心，文件很小的。这是生成二维码的dll文件。如果少了后面就没法操作了。

2.控制器

 1 using System.Web.Mvc;
 2 using ThoughtWorks;
 3 using ThoughtWorks.QRCode;
 4 using ThoughtWorks.QRCode.Codec;
 5 using ThoughtWorks.QRCode.Codec.Data;
 6 using System.Drawing;
 7 using System.IO;
 8 using System.Text;
 9 public string CreateQRCode(string text)
10         {
11             QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
12             qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
13             qrCodeEncoder.QRCodeScale = 4;
14             qrCodeEncoder.QRCodeVersion = 8;
15             qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
16             System.Drawing.Image image = qrCodeEncoder.Encode(text, Encoding.UTF8);
17             string targetFilePath = Path.Combine(Request.MapPath("~/image/"));
18             if (!Directory.Exists(targetFilePath))//文件夹不存在的时候创建
19             {
20                 Directory.CreateDirectory(targetFilePath);
21             }
22             string filename = DateTime.Now.ToString("yyyymmddhhmmssfff").ToString() + ".jpg";
23             string filepath = Server.MapPath(@"~/image/") + filename;
24             System.IO.FileStream fs = new System.IO.FileStream(filepath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
25             image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
26 
27             fs.Close();
28             image.Dispose();
29             return filename;
30         }

3.html

 1 <div>
 2     <table>
 3         <tr>
 4             <td><img id="imgs" /></td>
 5         </tr>
 6         <tr>
 7             <td><input id="text" /></td>
 8         </tr>
 9         <tr>
10             <td><button type="button" style="height:30px;100px" onclick="generateQRCord(this)">生成二维码</button></td>
11         </tr>
12     </table>
13 </div>
14 
15 <script>
16     function generateQRCord(obj) {
17         var text = $("#text").val();
18         $.post("/Home/CreateQRCode", { text: text }, function (data) {
19             $("#imgs").attr("src", "/image/" + data);
20         })
21     }
22 </script>