public IActionResult QrCode(string content, int pixel)
{
    content = HttpUtility.UrlDecode(content);
    string logoPath = Path.Combine(AppContext.BaseDirectory, "wwwroot", "images", "log.png");
    using (QRCodeGenerator qrGenerator = new QRCodeGenerator())
    using (QRCodeData qrCodeData = qrGenerator.CreateQrCode(content, QRCodeGenerator.ECCLevel.Q))
    using (PngByteQRCode qrCode = new PngByteQRCode(qrCodeData))
    {
        var qrCodeBytes = qrCode.GetGraphic(pixel, Color.Black, Color.White);
        using (MemoryStream ms = new MemoryStream(qrCodeBytes))
        {
            SKBitmap qrCodeImage = SKBitmap.Decode(ms);
            using (var logoStream = System.IO.File.Open(logoPath, FileMode.Open, FileAccess.Read, FileShare.Read))
            {
                SKBitmap logo = SKBitmap.Decode(logoStream);
                int logoSize = Math.Min(qrCodeImage.Width / 3, qrCodeImage.Height / 3); // 根据二维码大小调整logo大小
                int x = (qrCodeImage.Width - logoSize) / 2;
                int y = (qrCodeImage.Height - logoSize) / 2;

                // 创建一个新的画布
                using (var canvas = new SKCanvas(qrCodeImage))
                {
                    // 绘制logo到二维码中心
                    canvas.DrawBitmap(logo, new SKRect(x, y, x + logoSize, y + logoSize));
                }
            }
            // 将最终的图像编码为PNG格式并返回内存流
            using (var image = SKImage.FromBitmap(qrCodeImage))
            using (var data = image.Encode(SKEncodedImageFormat.Png, 100))
            {
                return File(data.ToArray(), "image/png");
            }

        }
    }

}