public void CreateQrCode()
{
string host = Request.Url.Host;
var port = Request.Url.Port;
string str = "http://" + host + ":" + port + "/Chemical/ShowChemicalDevice?id=" + Request.Form["qrcode"];
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["SewagePlantIMS"].ConnectionString);
con.Open();
string sqlStr = "select cd_name from dm_chemical_device where id = " + Request.Form["qrcode"] + ";";
SqlCommand cmd = new SqlCommand(sqlStr, con);
string cd_name = cmd.ExecuteScalar().ToString();
con.Close();
using (var memoryStream = QRCodeHelper.GetQRCode(str, 10))
{
System.Drawing.Image img = Image.FromStream(memoryStream);
img = QRCodeHelper.AddTextToImg(img, cd_name, cd_name);
System.IO.MemoryStream ms = new System.IO.MemoryStream();
img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
Response.ContentType = "application/octet-stream";
//文件名+文件格式 （这里编码采用的是utf-8）
Response.AddHeader("Content-Disposition", "attachment; filename=" + HttpUtility.UrlEncode(cd_name + ".png", System.Text.Encoding.UTF8));
Response.BinaryWrite(ms.ToArray());
ms.Dispose();
img.Dispose();
}
}
