Creating QR Code In ASP.NET Core

using System.ComponentModel.DataAnnotations;

namespace GeneratingQRCode.Models
{
    public class QRCodeModel
    {
        [Display(Name = "Enter QRCode Text")]
        public string QRCodeText { get; set; }

    }
}

using GeneratingQRCode.Models;
using Microsoft.AspNetCore.Mvc;
using QRCoder;
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;

namespace GeneratingQRCode.Controllers
{
    public class HomeController : Controller
    {

        [HttpGet]
        public IActionResult CreateQRCode()
        {
            return View();
        }

        [HttpPost]
        public IActionResult CreateQRCode(QRCodeModel qRCode)
        {
            QRCodeGenerator QrGenerator = new QRCodeGenerator();
            QRCodeData QrCodeInfo = QrGenerator.CreateQrCode(qRCode.QRCodeText, QRCodeGenerator.ECCLevel.Q);
            QRCode QrCode = new QRCode(QrCodeInfo);
            Bitmap QrBitmap = QrCode.GetGraphic(60);  
            byte[] BitmapArray = QrBitmap.BitmapToByteArray();
            string QrUri = string.Format("data:image/png;base64,{0}", Convert.ToBase64String(BitmapArray));
            ViewBag.QrCodeUri = QrUri;
            return View();
        }
    }

    //Extension method to convert Bitmap to Byte Array
    public static class BitmapExtension
    {
        public static byte[] BitmapToByteArray(this Bitmap bitmap)
        {
            using (MemoryStream ms = new MemoryStream())
            {
                bitmap.Save(ms, ImageFormat.Png);
                return ms.ToArray();
            }
        }
    }
}

Step 5. Create The View

Create the view with the name CreateQRCode using the model class QRCodeModel by right clicking on the view folder or right clicking in the controller class file as shown in the following image.

After clicking the Add button, it generates the view with the name CreateQRCode. Now open the CreateQRCode.cshtml file and replace the default generated code as follows.

CreateQRCode.cshtml

@model GeneratingQRCode.Models.QRCodeModel

@{
    ViewData["Title"] = "www.compilemode.com";
}
<hr />
<div class="row">
    <div class="col-md-4">
        <form asp-action="CreateQRCode">
            <div asp-validation-summary="ModelOnly" class="text-danger"></div>
            <div class="form-group">
                <label asp-for="QRCodeText" class="control-label"></label>
                <input asp-for="QRCodeText" class="form-control" />
                <span asp-validation-for="QRCodeText" class="text-danger"></span>
            </div>
            <div class="form-group">
                <input type="submit" value="Generate QR Code" class="btn btn-primary text-center" />
            </div>
            <div class="form-group">

                <img src="@ViewBag.QrCodeUri" class="img-thumbnail" />
            </div>
        </form>
    </div>
</div>
@section Scripts {
    @{await Html.RenderPartialAsync("_ValidationScriptsPartial");}
}

In the preceding code you see the image tag src Uri assigned with ViewBag, which we have set from the HomeController class.

Step 6. Configure the Routing

We have modified the auto-generated files, so we have to set the default routing so that when you run the application, then the default view can start in the browser. Now open the Startup.cs and set the default routing as per our controller and the created view as shown in the following image.

After adding all the required files and configuration, the Solution explorer of our created ASP.NET core application will look like as follows.

Step 7. Run the Application

Now press Keyboard F5 or Visual Studio run button to run the application. After running the application, the following screen will be shown in the browser. Enter the QR code text and click on the Generate QR code button, then it will generate the following code as in the following screenshot.

Demo

Step 8. Read the QR Code

Open your mobile phone QR code reader application and scan it, it will show the following text which we have entered during the QR code creation.

Summary

I hope, from all the above examples, you have learned how to generate a QR code using the ASP.NET Core. If you like it, share it with your friends, subscribe to the blog and YouTube channel for more such articles.

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