第一步:下载ThoughtWorks.QRCode.dll 建议用这个版本的:1.0.2774.19990
下载路径:https://dl.pconline.com.cn/download/1407628-1.html
第二部封装一个类:引用 ThoughtWorks.QRCode.dll 控件
/// <summary>
???/// 二维码生成
???/// </summary>
???public class QrCodeHelper
???{
???????#region 保存图片
???????/// <summary>
???????/// 保存图片
???????/// </summary>
???????/// <param name="strPath">保存路径</param>
???????/// <param name="img">图片</param>
???????/// <returns>图片路径</returns>
???????public static string SaveImg(string strPath, Bitmap img)
???????{
???????????//保存图片到目录
???????????if (Directory.Exists(strPath))
???????????{
???????????????//文件名称
???????????????string guid = Guid.NewGuid().ToString().Replace("-", "") + ".png";
???????????????img.Save(strPath + "/" + guid, System.Drawing.Imaging.ImageFormat.Png);
???????????????return (guid);
???????????}
???????????else
???????????{
???????????????//当前目录不存在，则创建
???????????????Directory.CreateDirectory(strPath);
???????????????return "";
???????????}
???????}
???????#endregion
???????#region 生成二维码图片
???????/// <summary>
???????/// 生成二维码图片
???????/// </summary>
???????/// <param name="codeNumber">要生成二维码的字符串</param> ????
???????/// <param name="size">大小尺寸</param>
???????/// <returns>二维码图片</returns>
???????public static Bitmap Create_ImgCode(string codeNumber, int size)
???????{
???????????//创建二维码生成类
???????????QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
???????????//设置编码模式
???????????qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
???????????//设置编码测量度
???????????qrCodeEncoder.QRCodeScale = size;
???????????//设置编码版本
???????????qrCodeEncoder.QRCodeVersion = 0;
???????????//设置编码错误纠正
???????????qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
???????????//生成二维码图片
???????????System.Drawing.Bitmap image = qrCodeEncoder.Encode(codeNumber);
???????????return image;
???????}
???????#endregion
???????#region 打开指定目录
???????/// <summary>
???????/// 打开指定目录
???????/// </summary>
???????/// <param name="path"></param>
???????public static void Open_File(string path)
???????{
???????????System.Diagnostics.Process.Start("explorer.exe", path);
???????}
???????#endregion
???????#region 删除目录下所有文件
???????/// <summary>
???????/// 删除目录下所有文件
???????/// </summary>
???????/// <param name="aimPath">路径</param>
???????public static void DeleteDir(string aimPath)
???????{
???????????try
???????????{
???????????????//目录是否存在
???????????????if (Directory.Exists(aimPath))
???????????????{
???????????????????// 检查目标目录是否以目录分割字符结束如果不是则添加之
???????????????????if (aimPath[aimPath.Length - 1] != Path.DirectorySeparatorChar)
???????????????????????aimPath += Path.DirectorySeparatorChar;
???????????????????// 得到源目录的文件列表，该里面是包含文件以及目录路径的一个数组
???????????????????// 如果你指向Delete目标文件下面的文件而不包含目录请使用下面的方法
???????????????????string[] fileList = Directory.GetFiles(aimPath);
???????????????????//string[] fileList = Directory.GetFileSystemEntries(aimPath);
???????????????????// 遍历所有的文件和目录
???????????????????foreach (string file in fileList)
???????????????????{
???????????????????????// 先当作目录处理如果存在这个目录就递归Delete该目录下面的文件
???????????????????????if (Directory.Exists(file))
???????????????????????{
???????????????????????????DeleteDir(aimPath + Path.GetFileName(file));
???????????????????????}
???????????????????????// 否则直接Delete文件
???????????????????????else
???????????????????????{
???????????????????????????File.Delete(aimPath + Path.GetFileName(file));
???????????????????????}
???????????????????}
???????????????}
???????????}
???????????catch (Exception e)
???????????{
???????????????throw e;
???????????}
???????}
???????#endregion
第三部 :控制器代码
/// 生成二维码
???????/// </summary>
???????/// <returns></returns>
???????[HttpGet]
???????public ActionResult CreateQRcode()
???????{
???????????return View();
???????}
???????[HttpPost]
???????public ActionResult CreateQRcode(string content)
???????{
???????????string currentPath = Server.MapPath("~/.") + @"\Content\Own\BarCode_Images";//二维码图片存放的路径
???????????Bitmap bs = QrCodeHelper.Create_ImgCode(content, 8);//创建二维码图片
???????????string imgUrl = QrCodeHelper.SaveImg(currentPath, bs);//保存图片
???????????ViewBag.ImgUrl = @"/Content/Own/BarCode_Images" + @"/" + imgUrl;//将路径返回到前台引用
???????????return View();
???????}
第四部:前段代码
<div>
@{
???????????ViewBag.Title = "创建二维码";
???????}
???????<h2>创建二维码</h2>
???????<form id="form1" action="/My/CreateQRcode" method="post">
???????????<div>
???????????????请输入内容：<input type="text" name="content" />
???????????????<br />
???????????????<input id="Button1" value="生成二维码" type="submit" />
???????????</div>
???????????<div>
???????????????@if (ViewBag.ImgUrl != null)
???????????????{
???????????????????<img src="@ViewBag.ImgUrl" />
???????????????}
???????????</div>
???????</form>
???</div>
第五步:修改前段路径修改成自己的控制器名字
MVC二维码生成代码
原文地址：https://www.cnblogs.com/SuperGood/p/10566840.html