C# 生成二维码

 1 /// <summary>
 2         /// 生成二维码
 3         /// </summary>
 4         /// <param name="qrCodeScale">尺寸4-15</param>
 5         /// <param name="qrCodeVersion">复杂级别3-12</param>
 6         /// <param name="qrCodeErrorCorrect">容错量"H","L","M","Q"</param>
 7         /// <param name="url">二维码信息</param>
 8         /// <param name="uId">用户ID（唯一标识）</param>
 9         /// <returns></returns>
10         public static string CreateEQcoder(int qrCodeScale, int qrCodeVersion, string qrCodeErrorCorrect, string url, string uId)
11         {
12             QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
13             qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
14             qrCodeEncoder.QRCodeScale = qrCodeScale;
15             qrCodeEncoder.QRCodeVersion = qrCodeVersion;
16             switch (qrCodeErrorCorrect)
17             {
18                 case "H":
19                     qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
20                     break;
21                 case "L":
22                     qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
23                     break;
24                 case "M":
25                     qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
26                     break;
27                 case "Q":
28                     qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
29                     break;
30             }
31             qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
32             Bitmap bmPhoto = qrCodeEncoder.Encode(url, System.Text.Encoding.GetEncoding("UTF-8"));
33             string fileName = DateTime.Now.ToString("yyyy") + ".jpg";
34             string savePath = "/Tempuploads/" + uId + "/QRCode/";
35 
36             string dirPath = System.Web.HttpContext.Current.Server.MapPath(savePath);
37 
38             try
39             {
40                 if (!Directory.Exists(dirPath))
41                 {
42                     Directory.CreateDirectory(dirPath);
43                 }
44                 bmPhoto.Save(System.Web.HttpContext.Current.Server.MapPath("/") + savePath + fileName, ImageFormat.Jpeg);
45                 bmPhoto.Dispose();
46                 return savePath + fileName;
47             }
48             catch (Exception)
49             {
50                 return "";
51             }
52             finally
53             {
54                 bmPhoto.Dispose();
55             }
56         }

QRCodeDecoder decoder = new QRCodeDecoder();   
String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(bmPhoto)));   
string Text = decodedString;