高校手机签到系统——zxing.net生成二维码（补充）

　　高校手机签到系统——第一部分Authority权限系统（上）

　　高校手机签到系统——第一部分Authority权限系统（下）

　　高校手机签到系统——手机客户端

　　关于zxing.net的使用网上已有很多说明，可是在mvc模式下，怎么保存生成的图片返回链接？

使用zxing生成bitmap:

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BarcodeWriter writer = new BarcodeWriter             {                 Format = BarcodeFormat.QR_CODE,                 Options = new EncodingOptions                     {                         Width = 400,                         Height = 400                     }             };             string time = DateTime.Now.ToString();             Bitmap bitmap = writer.Write(id + "|" + time);

 此bitmap有一save方法Image.Save (String, ImageCodecInfo, EncoderParameters)，参数分别是路径，编码器，以及编码器参数。

初始化编码器ImageCodecInfo imageCodecInfo = (from e in ImageCodecInfo.GetImageEncoders() where e.MimeType == "image/jpeg" select e).First();

初始化编码器参数EncoderParameters encoderParameters = new EncoderParameters(1);
            EncoderParameter encoderParameter = new EncoderParameter(Encoder.Quality, 75L);

接下来保存到相应的路径即可。完整的代码：

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public ActionResult LoadQrcode(string id)         {             BarcodeWriter writer = new BarcodeWriter             {                 Format = BarcodeFormat.QR_CODE,                 Options = new EncodingOptions                     {                         Width = 400,                         Height = 400                     }             };             string time = DateTime.Now.ToString();             Bitmap bitmap = writer.Write(id + "|" + time);             ImageCodecInfo imageCodecInfo = (from e in ImageCodecInfo.GetImageEncoders() where e.MimeType == "image/jpeg" select e).First();             EncoderParameters encoderParameters = new EncoderParameters(1);             EncoderParameter encoderParameter = new EncoderParameter(Encoder.Quality, 75L);             encoderParameters.Param[0] = encoderParameter;             if (Directory.Exists(Server.MapPath("/Images/" + id + "/")))             {                 FileInfo[] files = new DirectoryInfo(Server.MapPath("/Images/" + id + "/")).GetFiles();                 foreach (FileInfo fi in files)                     System.IO.File.Delete(Path.Combine(Server.MapPath("/Images/" + id + "/"), fi.Name));             }             else                 Directory.CreateDirectory(Server.MapPath("/Images/" + id + "/"));             bitmap.Save(Path.Combine(Server.MapPath("/Images/" + id + "/"), DateTime.Now.Date.ToFileTimeUtc()+ ".jpeg"), imageCodecInfo, encoderParameters);             return Json("/Images/" + id + "/" + DateTime.Now.Date.ToFileTimeUtc() + ".jpeg", JsonRequestBehavior.AllowGet);         }