.net 生成二维码

需要的类

安装包 QRCoder

1. QRCodeHelper  二维码帮助类

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namespace SmartGardon.Common.QRCode {     /// <summary>     /// 二维码帮助类     /// </summary>     public class QRCodeHelper     {         /// <summary>         /// 生成二维码图片         /// </summary>         /// <param name="str"></param>         /// <returns></returns>         public Bitmap CreateQRimg(string str)         {             QRCodeGenerator qrGenerator = new QRCodeGenerator();             QRCodeData qrCodeData = qrGenerator.CreateQrCode(str, QRCodeGenerator.ECCLevel.Q);             QRCoder.QRCode qrCode = new QRCoder.QRCode(qrCodeData);             Bitmap bt = qrCode.GetGraphic(20);               return bt;         }           /// <summary>         /// 生成二维码图片流（二维码上含文字）         /// </summary>         /// <param name="str1">二维码中要传递的数据（地址）</param>         /// <param name="str2">二维码上显示的文字说明</param>         public byte[] GenerateQRCode(string str1, string str2)         {             using (Image codeImage = CreateQRimg(str1), strImage = ConvertStringToImage(str2))             {                 Image img = CombineImage(600, 600, codeImage, 60, 50, strImage, 0, 530);                 using (var stream = new MemoryStream())                 {                     img.Save(stream, ImageFormat.Jpeg);                     //输出图片流                     return stream.ToArray();                 }             }         }           /// <summary>         /// 生成二维码图片流（不含文字）         /// </summary>         /// <param name="str">二维码中要传递的数据（地址）</param>         /// <returns></returns>         public byte[] GenerateQRCode(string str)         {             using (Image codeImage = CreateQRimg(str))             {                 using (var stream = new MemoryStream())                 {                     codeImage.Save(stream, ImageFormat.Jpeg);                       return stream.ToArray();                 }             }         }           /// <summary>         /// 生成文字图片         /// </summary>         /// <param name="str"></param>         /// <returns></returns>         public Image ConvertStringToImage(string str)         {             Bitmap image = new Bitmap(600, 40, PixelFormat.Format24bppRgb);               Graphics g = Graphics.FromImage(image);               Font font = new Font("SimHei", 14, FontStyle.Regular);               g.Clear(Color.White);               StringFormat format = new StringFormat();             format.Alignment = StringAlignment.Center;             format.LineAlignment = StringAlignment.Center;               Rectangle rectangle = new Rectangle(0, 0, 600, 40);               g.DrawString(str, font, new SolidBrush(Color.Black), rectangle, format);               return image;           }           /// <summary>         /// 在画板中合并二维码图片和文字图片         /// </summary>         /// <param name="width"></param>         /// <param name="height"></param>         /// <param name="imgLeft"></param>         /// <param name="imgLeft_left"></param>         /// <param name="imgLeft_top"></param>         /// <param name="imgRight"></param>         /// <param name="imgRight_left"></param>         /// <param name="imgRight_top"></param>         /// <returns></returns>         public Image CombineImage(int width, int height, Image imgLeft, int imgLeft_left, int imgLeft_top, Image imgRight, int imgRight_left, int imgRight_top)         {             Bitmap image = new Bitmap(width, height, PixelFormat.Format24bppRgb);               Graphics g = Graphics.FromImage(image);                 g.Clear(Color.White);             g.DrawImage(imgLeft, imgLeft_left, imgLeft_top, 500, 500);             g.DrawImage(imgRight, imgRight_left, imgRight_top, imgRight.Width, imgRight.Height);               return image;           }     } }

　　2.使用QRCodeHelper  

 public virtual async Task<string> GetQRCodeAsync()
        {
            var qrCode = new QRCodeHelper();var url = "https://www.baidu.com";
            var image = qrCode.GenerateQRCode(url, “显示的文字信息”);
            string result = "data:image/jpg;base64," + Convert.ToBase64String(image);
            return result;
        }