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ASP.NET实现二维码

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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using ThoughtWorks.QRCode.Codec;

namespace WeChat
{
public partial class WebForm2 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{

}

protected void btnCRC_Click(object sender, EventArgs e)
{
//创建时间
DateTime currentTime = new System.DateTime();
//取当前年月日时分秒
currentTime = System.DateTime.Now;
//取当前年
int Year = currentTime.Year;
//取当前月
int Month = currentTime.Month;
//取当前日
int Day = currentTime.Day;
if (Day < 10)
{
Day = 0 + Day;
}
//取当前时
int Hour = currentTime.Hour;
//取当前分
int Minute = currentTime.Minute;
int Minute1 = currentTime.Minute + 10;
//取当前秒
int Second = currentTime.Second;
//取当前毫秒
int Millisecond = currentTime.Millisecond;
this.txtCRC.Text = Second.ToString();
ThoughtWorksQRCode("您好欢迎使用二维码查看！");
}
private void ThoughtWorksQRCode(string strtxt)
{
try
{
Bitmap bt;
string enCodeString = strtxt;
QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
bt = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8);
string filename = DateTime.Now.ToString("yyyymmddhhmmss");
filename = filename.Replace(" ", "");
filename = filename.Replace(":", "");
filename = filename.Replace("-", "");
filename = filename.Replace(".", "");
bt.Save(Server.MapPath("~/images/") + filename + ".jpg");
this.Image1.ImageUrl = "~/images/" + filename + ".jpg";
}
catch (Exception e)
{
throw e;
}

}

//public void GenerateQRCode(string content)
//{
// try
// {
// // _fileLog.Info("GenerateQRCode|开始生成二维码");
// if (null != content)
// {
// //初始化二维码生成工具
// var qrCodeEncoder = new QRCodeEncoder
// {
// QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE,
// QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M,
// QRCodeVersion = 0,
// QRCodeScale = 4
// };
// //将字符串生成二维码图片
// var image = qrCodeEncoder.Encode(content);
// var ms = new MemoryStream();
// image.Save(ms, ImageFormat.Png);
// Response.BinaryWrite(ms.GetBuffer());
// Response.End();
// }
// //_fileLog.Info("CloudCardController|GenerateQRCode|成功生成二维码");
// }
// catch (Exception ex)
// {
// //_fileLog.Error("GenerateQRCode|生成二维码出现异常,异常信息：" + ex.Message);
// }

//}
//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;
//}
}
}

转自：https://www.cnblogs.com/zoujinhua/p/10308661.html