基于Asp.Net Core，利用ZXing来生成二维码的一般流程

1 <div style="text-align:center">
2     <div style="margin-top:20px">
3         <span>扫码获取</span><br/>
4         <img id="barcode" width="400" height="400" alt="扫码获取" src="Dynpass/GetBarCode"/>
5     </div>
6 </div>

 1  public class DynPassController : Controller
 2     {
 3         private readonly BarCodeVue  _barCodeContent;//
 4         public DynPassController(IOptions<BarCodeVue> content)
 5         {
 6             this._barCodeContent = content.Value;
 7         }
 8 
 9         /// <summary>
10         /// 初始化显示页面
11         /// </summary>
12         /// <returns></returns>
13         [HttpGet]
14         public IActionResult Login()
15         {
16             return View();
17         }
18 
19         /// <summary>
20         /// Svn显示==请求获取二维码资源
21         /// </summary>
22         /// <returns></returns>
23         [HttpGet]
24         public ActionResult GetBarCode()
25         {
26             var bar= _barCodeContent != null ? _barCodeContent.BarCode : "扫码获取";
27             Bitmap bitmap = MyZxingBarcode.GenerateBitmapCode(bar);//扫码获取
28             System.IO.MemoryStream ms = new System.IO.MemoryStream();
29             bitmap.Save(ms, ImageFormat.Bmp);
30             return File(ms.GetBuffer(), "image/png");//
31         }
32     }

1  public class BarCodeVue
2     {
3         public string BarCode { get; set; }
4     }

 1 {
 2   "Logging": {
 3     "LogLevel": {
 4       "Default": "Information",
 5       "Microsoft": "Warning",
 6       "Microsoft.Hosting.Lifetime": "Information"
 7     }
 8   },
 9   "BarCodeVue": {
10     "BarCode":"MyBarCode"
11   },
12 
13   "AllowedHosts": "*"
14 }

 1  // This method gets called by the runtime. Use this method to add services to the container.
 2         public void ConfigureServices(IServiceCollection services)
 3         {
 4             services.Configure<CookiePolicyOptions>(options =>
 5             {
 6                 // This lambda determines whether user consent for non-essential cookies is needed for a given request.
 7                 options.CheckConsentNeeded = context => true;
 8             });
 9             services.Configure<BarCodeVue>(Configuration.GetSection("BarCodeVue"));//注册BarCodeVue键值
10             //services.AddMvc().AddViewOptions(options => options.HtmlHelperOptions.ClientValidationEnabled = true);
11             services.AddControllersWithViews()
12                 .AddNewtonsoftJson();
13             services.AddRazorPages();
14         }

  public class MyZxingBarcode
    {
        /// <summary>
        /// 生成二维码,保存成图片
        /// </summary>
        public static Bitmap GenerateBitmapCode(string content)
        {
            var writer = new BarcodeWriterPixelData();
            writer.Format = BarcodeFormat.QR_CODE;
            QrCodeEncodingOptions options = new QrCodeEncodingOptions();
            options.DisableECI = true;
            //设置内容编码
            options.CharacterSet = "UTF-8";
            //设置二维码的宽度和高度
            options.Width = 300;
            options.Height = 300;
            //设置二维码的边距,单位不是固定像素
            options.Margin = 1;
            writer.Options = options;
            //
            var pixdata = writer.Write(content);
            var map = PixToBitmap(pixdata.Pixels, pixdata.Width, pixdata.Height);
            //string filename = @"D:\generate1.png";
            //map.Save(filename, ImageFormat.Bmp);
            return map;
        }

        /// <summary>  
        /// 将一个字节数组转换为位图  
        /// </summary>  
        /// <param name="pixValue">显示字节数组</param>  
        /// <param name="width">图像宽度</param>  
        /// <param name="height">图像高度</param>  
        /// <returns>位图</returns>  
        private static Bitmap PixToBitmap(byte[] pixValue, int width, int height)
        {
            //// 申请目标位图的变量，并将其内存区域锁定
            var m_currBitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb);
            var m_rect = new Rectangle(0, 0, width, height);
            var m_bitmapData = m_currBitmap.LockBits(m_rect, ImageLockMode.WriteOnly, PixelFormat.Format32bppRgb);

            IntPtr iptr = m_bitmapData.Scan0;  // 获取bmpData的内存起始位置  

            //// 用Marshal的Copy方法，将刚才得到的内存字节数组复制到BitmapData中  
            System.Runtime.InteropServices.Marshal.Copy(pixValue, 0, iptr, pixValue.Length);
            m_currBitmap.UnlockBits(m_bitmapData);
            //// 算法到此结束，返回结果  

            return m_currBitmap;


            ////初始化条形码格式，宽高，以及PureBarcode=true则不会留白框
            //var writer = new BarcodeWriterPixelData
            //{
            //    Format = BarcodeFormat.QR_CODE,
            //    Options = new ZXing.Common.EncodingOptions { Height = 31, Width = 167, PureBarcode = true, Margin = 1 }
            //};
            //var pixelData = writer.Write("123236699555555555559989966");
            //using (var bitmap = new Bitmap(pixelData.Width, pixelData.Height, PixelFormat.Format32bppRgb))
            //using (var ms = new MemoryStream())
            //{
            //    var bitmapData = bitmap.LockBits(new Rectangle(0, 0, pixelData.Width, pixelData.Height),
            //       System.Drawing.Imaging.ImageLockMode.WriteOnly, PixelFormat.Format32bppRgb);
            //    try
            //    {
            //        // we assume that the row stride of the bitmap is aligned to 4 byte multiplied by the width of the image
            //        System.Runtime.InteropServices.Marshal.Copy(pixelData.Pixels, 0, bitmapData.Scan0, pixelData.Pixels.Length);
            //    }
            //    finally
            //    {
            //        bitmap.UnlockBits(bitmapData);
            //    }
            //    // save to stream as PNG
            //    bitmap.Save(ms, ImageFormat.Png);
            //    Image image = Bitmap.FromStream(ms, true);
            //    image.Save(@"D:\content.png");
            //    byte[] bytes = ms.GetBuffer();
            //}
        }
    }