Nuget安装ZXing.Net，帮助类：

using System;using System.Collections.Generic;using System.Drawing;using System.Drawing.Imaging;using ZXing;using ZXing.Common;using ZXing.QrCode;using ZXing.QrCode.Internal;namespace CommonHelper{    public class BarcodeHelper    {        /// 
        /// 生成二维码        /// 
        /// 内容        /// 宽度        /// 高度        /// 
             public static Bitmap Generate1(string text, int width, int height)        {            BarcodeWriter writer = new BarcodeWriter();            writer.Format = BarcodeFormat.QR_CODE;            QrCodeEncodingOptions options = new QrCodeEncodingOptions()            {                DisableECI = true,//设置内容编码                CharacterSet = "UTF-8",  //设置二维码的宽度和高度                Width = width,                Height = height,                Margin = 1//设置二维码的边距,单位不是固定像素            };            writer.Options = options;            Bitmap map = writer.Write(text);            return map;        }        /// 
        /// 生成一维条形码        /// 
        /// 内容        /// 宽度        /// 高度        /// 
             public static Bitmap Generate2(string text, int width, int height)        {            BarcodeWriter writer = new BarcodeWriter();            //使用ITF 格式，不能被现在常用的支付宝、微信扫出来            //如果想生成可识别的可以使用 CODE_128 格式            //writer.Format = BarcodeFormat.ITF;            writer.Format = BarcodeFormat.CODE_39;            EncodingOptions options = new EncodingOptions()            {                Width = width,                Height = height,                Margin = 2            };            writer.Options = options;            Bitmap map = writer.Write(text);            return map;        }        /// 
        /// 生成带Logo的二维码        /// 
        /// 内容        /// 宽度        /// 高度        public static Bitmap Generate3(string text, int width, int height)        {            //Logo 图片            string logoPath = System.AppDomain.CurrentDomain.BaseDirectory + @"\img\logo.png";            Bitmap logo = new Bitmap(logoPath);            //构造二维码写码器            MultiFormatWriter writer = new MultiFormatWriter();            Dictionary
     
       hint = new Dictionary
      
       ();            hint.Add(EncodeHintType.CHARACTER_SET, "UTF-8");            hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);            //hint.Add(EncodeHintType.MARGIN, 2);//旧版本不起作用，需要手动去除白边            //生成二维码             BitMatrix bm = writer.encode(text, BarcodeFormat.QR_CODE, width + 30, height + 30, hint);            bm = deleteWhite(bm);            BarcodeWriter barcodeWriter = new BarcodeWriter();            Bitmap map = barcodeWriter.Write(bm);            //获取二维码实际尺寸（去掉二维码两边空白后的实际尺寸）            int[] rectangle = bm.getEnclosingRectangle();            //计算插入图片的大小和位置            int middleW = Math.Min((int)(rectangle[2] / 3), logo.Width);            int middleH = Math.Min((int)(rectangle[3] / 3), logo.Height);            int middleL = (map.Width - middleW) / 2;            int middleT = (map.Height - middleH) / 2;            Bitmap bmpimg = new Bitmap(map.Width, map.Height, PixelFormat.Format32bppArgb);            using (Graphics g = Graphics.FromImage(bmpimg))            {                g.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;                g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;                g.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;                g.DrawImage(map, 0, 0, width, height);                //白底将二维码插入图片                g.FillRectangle(Brushes.White, middleL, middleT, middleW, middleH);                g.DrawImage(logo, middleL, middleT, middleW, middleH);            }            return bmpimg;        }        /// 
       
        /// 删除默认对应的空白        /// 
        /// 
               /// 
               private static BitMatrix deleteWhite(BitMatrix matrix)        {            int[] rec = matrix.getEnclosingRectangle();            int resWidth = rec[2] + 1;            int resHeight = rec[3] + 1;            BitMatrix resMatrix = new BitMatrix(resWidth, resHeight);            resMatrix.clear();            for (int i = 0; i < resWidth; i++)            {                for (int j = 0; j < resHeight; j++)                {                    if (matrix[i + rec[0], j + rec[1]])                        resMatrix[i, j] = true;                }            }            return resMatrix;        }    }}
      
     

使用：保存为文件流

public ActionResult GenerateBarCode(string contents)        {            MemoryStream ms = new MemoryStream();            Bitmap bitmap = BarcodeHelper.Generate2(contents, 270, 50);            Graphics g = Graphics.FromImage(bitmap);            bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);            g.Dispose();            bitmap.Dispose();            return File(ms.ToArray(), "image/jpeg");        }

保存为文件：

/// 
        /// 生成条形码        /// 
        ///         /// 
             public static string GenerateBarCode(string contents)        {            string fileName = AppDomain.CurrentDomain.BaseDirectory + "BarCode\\" + Guid.NewGuid().ToString() + ".jpg";            fileName = fileName.Replace("\\bin\\Debug", "");            MemoryStream ms = new MemoryStream();            Bitmap bitmap = BarcodeHelper2.Generate2(contents, 270, 50);            Graphics g = Graphics.FromImage(bitmap);            bitmap.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);            g.Dispose();            bitmap.Dispose();            using (FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.Write))            {                byte[] buffer = ms.ToArray();//转化为byte格式存储                fs.Write(buffer, 0, buffer.Length);                fs.Flush();                buffer = null;            }            return fileName;        }

MVC页面：

参考：https://www.cnblogs.com/hsiang/p/8452984.html