Create QR Codes with .NET

dotnet add package QRCoder

 1// Defining the QRCodeProvider class
 2// Add an interface to your code!
 3public class QRCodeProvider
 4{
 5    // Creating a new instance of QRCodeGenerator
 6    // In principle, this class supports IDisposable, but we can re-use this instance
 7    private static readonly QRCodeGenerator s_qrGenerator = new();
 8
 9    // Method to generate the QR code
10    public byte[] GeneratePng(string text)
11    {
12        // Creating the QR code data with our defaults
13        using QRCodeData qrCodeData = s_qrGenerator.CreateQrCode(text, QRCodeGenerator.ECCLevel.Q);
14
15        // Creating a new instance of PngByteQRCode with the QR code data
16        // We can also use other Image types, like BitmapByteQRCode
17        PngByteQRCode qrCode = new (qrCodeData);
18
19        // Returning the QR code as a graphic
20        return qrCode.GetGraphic(pixelsPerModule: 20);
21    }
22}

 1// NuGet: https://github.com/codebude/QRCoder
 2using QRCoder;
 3
 4namespace BenjaminAbt_Samples_QrCode // Defining the namespace
 5{
 6    internal class Program // Defining the Program class
 7    {
 8        static void Main(string[] args)
 9        {
10            // Creating a new instance of QRCodeProvider
11            // This is our own abstraction
12            QRCodeProvider qrCodeProvider = new();
13
14            // Defining the path where the QR code will be saved
15            // You can use different types of images and also svg or In-Memory
16            string path = @"C:\temp\qrcodetest.png";
17
18            string sampleText = "Hello World";
19
20            // Generating the QR code
21            byte[] png = qrCodeProvider.GeneratePng(sampleText);
22
23            File.WriteAllBytes(path, png); // Writing the QR code to the file
24        }
25    }
26
27    // QRCodeProvider here
28}