net core 生成二維碼

添加程序集引用
ThoughtWorks.QRCode

採用dotnet 運行時安裝

dotnet add package ThoughtWorks.QRCode

下面的實例不僅生成了二維碼，還在二維碼中心位置增加了文字，便於人進行區分

public async Task<StringDataResult> getQrCodeWithText(string text,string code)
        {
            StringDataResult result = new StringDataResult();

            try
            {
                QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
                qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
                qrCodeEncoder.QRCodeScale = 10;
                qrCodeEncoder.QRCodeVersion = 0;
                qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;

                var image = qrCodeEncoder.Encode(code, System.Text.Encoding.UTF8);

                //var width = image.Width / 10;
                //var dwidth = width * 2;
                //Bitmap bmp = new Bitmap(image.Width + dwidth, image.Height + dwidth);
                float fontsize = 36;
               

                Graphics g = Graphics.FromImage(image);
                GraphicsPath myPath = new GraphicsPath();

                //g.Clear(Color.White);
                FontFamily family = new FontFamily("Microsoft YaHei");
                
                StringFormat format = StringFormat.GenericDefault;
                myPath.AddString(text, family, 1, fontsize, new Point((Int32)(image.Width - text.Length * fontsize) / 2, (int)((image.Height - fontsize) * 0.5)), format);
                //g.DrawString()
                g.DrawPath(new Pen(Color.White,10), myPath);
                g.FillPath(Brushes.Black, myPath);

                g.Dispose();

                result.Data = "data:image/png;base64," + image.ToBase64();

                image.Dispose();

                if (!string.IsNullOrWhiteSpace(result.Data))
                {
                    result.Success = true;
                    result.Message = "生成二維碼成功";
                }

                return result;
            }
            catch (Exception ex)
            {
                result.Data = ex.ToString();

                return result;
            }
        }