如何生存二维码图片保存到本地

添加引用：using Gma.QrCodeNet.Encoding.Windows.Render;
using Gma.QrCodeNet.Encoding;
引用Gma.QrCodeNet.Encoding.dll文件
 string helloWorld = "helloWorld";            QrEncoder qrEncoder = new QrEncoder(ErrorCorrectionLevel.H);            QrCode qrCode = new QrCode();            qrEncoder.TryEncode(helloWorld, out qrCode);            GraphicsRenderer renderer = new GraphicsRenderer(new FixedModuleSize(12, QuietZoneModules.Two));            MemoryStream ms = new MemoryStream();            using (FileStream stream = new FileStream(@"C:/Users/Administrator/Desktop/新建文件夹/HelloWorld.png", FileMode.Create))            {                //ImageFormat.Png和BMP两种格式不会有黑边框                renderer.WriteToStream(qrCode.Matrix, ImageFormat.Png, stream);            }