.net core里用ZXing生成二维码

先获取Nuget包

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static void Main(string[] args) {     string content = "二维码信息";     BitMatrix byteMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, 300, 300);     System.Drawing.Bitmap bitmap = toBitmap(byteMatrix); }   public static System.Drawing.Bitmap toBitmap(BitMatrix matrix) {     int width = matrix.Width;     int height = matrix.Height;     var white = System.Drawing.ColorTranslator.FromHtml("0xFFFFFFFF");     var black = System.Drawing.ColorTranslator.FromHtml("0xFF000000");     System.Drawing.Bitmap bmap = new System.Drawing.Bitmap(width, height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);     for (int x = 0; x < width; x++)     {         for (int y = 0; y < height; y++)         {             bmap.SetPixel(x, y, matrix[x, y] ? black : white);         }     }     return bmap; }