ASP.NET Core: Generate Barcode using ASP.NET Core in C#

After you finish creating a new ASP.NET Core project. You can create a BarcodeController by right-click on Controllers folder => Add => Controller

Selecting MVC Controller - Empty

Entering your controller name

Next, Right-click on your project, then select Manage Nuget Packages => Search and Install barcodelib to your project.

Creating a ConvertImageToBytes method allows you to convert image to byte array in c#.

private byte[] ConvertImageToBytes(Image img)
{
    using (MemoryStream ms = new MemoryStream())
    {
        img.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        return ms.ToArray();
    }
}

Creating an Image action allows you to generate barcode in asp.net mvc core

public IActionResult Image()
{
    Barcode barcode = new Barcode();
    Image img = barcode.Encode(TYPE.UPCA, "123456789025", Color.Black, Color.White, 250, 100);
    var data = ConvertImageToBytes(img);
    return File(data, "image/jpeg");
}

If you want to embed the barcode inside html, you can right click on Index action, then create an Index view

public IActionResult Index()
{
    return View();
}

Index View

@{
    ViewData["Title"] = "Index";
}

<h1>Index</h1>

<img src='@Url.Action("Image")' alt="barcode" />

Press F5 to run your project, then change your url Barcode/Index