Generate barcode image in ASP.NET Core application
In This Topic
This tutorial shows how to create a blank ASP.NET Core Web application in Visual Studio .NET 2019 and generate barcode image in ASP.NET Core application.
Here are steps, which must be done:
-
Create a blank ASP.NET Core Web application.
Open Visual Studio .NET 2019 and create a new project, of ASP.NET Core Web application type:

Select the "None" template for ASP.NET Core Web application and configure the project to use ASP.NET Core 3.1:

-
Server side: Add references to the Vintasoft assemblies to ASP.NET Core Web application.
Add references to the Vintasoft.Barcode.dll, Vintasoft.Shared.dll, Vintasoft.Shared.Web.dll, Vintasoft.Barcode.Web.Services.dll and Vintasoft.Barcode.AspNetCore.ApiControllers.dll assemblies from "<InstallPath>\VintaSoft Barcode .NET v12.5\Bin\DotNetCore3\AnyCPU\" folder in ASP.NET Core Web application.
-
Server side: Add Web API controller that allows to generate barcode image.
- Add the "Controllers" folder to the project.
- Press the right mouse button on the "Controllers" folder and select the "Add => Controller..." menu from context menu

- Select Empty API controller template, set the controller name to the "MyVintasoftBarcodeApiController" and press the "Add" button

- Specify that MyVintasoftBarcodeApiController class is derived from Vintasoft.Barcode.AspNetCore.ApiControllers.VintasoftBarcodeApiController class

Here are source codes of MyVintasoftBarcodeApiController class:
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Vintasoft.Barcode.AspNetCore.ApiControllers;
namespace WebApplication1.Controllers
{
public class MyVintasoftBarcodeApiController : VintasoftBarcodeApiController
{
public MyVintasoftBarcodeApiController(IWebHostEnvironment hostingEnvironment)
: base(hostingEnvironment)
{
}
}
}
-
Server side: Create MVC controller for web view that will display generated barcode.
- Press the right mouse button on the "Controllers" folder and select the "Add => Controller..." menu from context menu

- Select "MVC Controller - Empty" template, set the controller name to the "DefaultController" and press the "Add" button

- Open "Startup.cs" file, add controllers with views to the services of ASP.NET Core application:

Add created MVC controller to the endpoints of ASP.NET Core application:

Here are C# source codes of Startup.cs file:
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
namespace WebApplication1
{
public class Startup
{
// This method gets called by the runtime. Use this method to add services to the container.
// For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
public void ConfigureServices(IServiceCollection services)
{
services.AddControllersWithViews();
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
app.UseStaticFiles();
app.UseRouting();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute("default", "{controller=Default}/{action=Index}/{id?}");
});
}
}
}
-
Client side: Create web view for displaying generated barcode.
- Open "DefaultController.cs" file, press the right mouse button on the "Index" method of DefaultController class and select the "Add View..." menu from context menu

- Select "Razor View" template, Set view name to "Index", uncheck "Use a layout page" checkbox and press the "Add" button => "Views\Default\Index.cshtml" file will be created

-
Client side: Add Vintasoft JavaScript files to the project.
- Add the "wwwroot\Scripts\" folder to ASP.NET Core application.
- Copy jQuery (version 3 or higher) file into "wwwroot\Scripts\" folder.
You can use jquery-3.4.1.min.js file from "<InstallPath>\VintaSoft Barcode .NET v12.5\Examples\ASP.NET MVC\CSharp\AspNetMvcBarcodeDemo\Scripts\External\" folder or jQuery (version 3 or higher) file from any other source.
- Copy Vintasoft.Shared.js and Vintasoft.Barcode.js files from "<InstallPath>\VintaSoft Barcode .NET v12.5\Bin\JavaScript\" folder into "wwwroot\Scripts\" folder.

-
Client side: Add JavaScript code, which generates and displays barcode image, to the web view.
- Open web view - file "Views\Default\Index.cshtml".

- Add references to Vintasoft JavaScript files:

Here is HTML code that adds references to jQuery and Vintasoft JavaScript files:
<script src="~/Scripts/jquery-3.4.1.min.js" type="text/javascript"></script>
<script src="~/Scripts/Vintasoft.Shared.js" type="text/javascript"></script>
<script src="~/Scripts/Vintasoft.Barcode.js" type="text/javascript"></script>
- Add HTML markup (an image element that will display generated barcode image) to the web view:

Here is HTML markup code:
<img id="barcodeImage" src="" />
- Add JavaScript code that generates and displays barcode image:

Here is JavaScript code that generates and displays barcode image:
<script type="text/javascript">
/**
* Generates 1D barcode image.
*/
function generate1dBarcodeImage(barcodeType, barcodeValue) {
// create service that allows to generate barcode
var barcodeService = new Vintasoft.Shared.WebServiceControllerJS("/vintasoft/api/MyVintasoftBarcodeApi");
// create the barcode writer
var barcodeWriter = new Vintasoft.Barcode.WebBarcodeWriterJS(barcodeService);
// create the barcode writer settings for generating 1D barcode
var barcodeWriterSettings = new Vintasoft.Barcode.Web1DBarcodeWriterSettingsJS();
// specify that barcode writer must generate QR barcode image
barcodeWriterSettings.set_BarcodeType(new Vintasoft.Barcode.Web1DBarcodeTypeEnumJS(barcodeType));
// specify the Code128 barcode value
barcodeWriterSettings.set_Value(barcodeValue);
// specify settings for barcode writer
barcodeWriter.set_Settings(barcodeWriterSettings);
// send an asynchronous request for getting barcode image as Base64 string
barcodeWriter.getBarcodeAsBase64Image(__writeBarcode_success, __writeBarcode_failed);
}
/**
* Generates 2D barcode image.
*/
function generate2dBarcodeImage(barcodeType, barcodeValue) {
// create web service that allows to generate barcode
var barcodeService = new Vintasoft.Shared.WebServiceControllerJS("/vintasoft/api/MyVintasoftBarcodeApi");
// create the barcode writer
var barcodeWriter = new Vintasoft.Barcode.WebBarcodeWriterJS(barcodeService);
// create the barcode writer settings for generating 2D barcode
var barcodeWriterSettings = new Vintasoft.Barcode.Web2DBarcodeWriterSettingsJS();
// specify that barcode writer must generate QR barcode image
barcodeWriterSettings.set_BarcodeType(new Vintasoft.Barcode.Web2DBarcodeTypeEnumJS(barcodeType));
// specify the QR barcode value
barcodeWriterSettings.set_Value(barcodeValue);
// specify settings for barcode writer
barcodeWriter.set_Settings(barcodeWriterSettings);
// send an asynchronous request for getting barcode image as Base64 string
barcodeWriter.getBarcodeAsBase64Image(__writeBarcode_success, __writeBarcode_failed);
}
/**
* Barcode is generated successfully.
*/
function __writeBarcode_success(data) {
if (data.success) {
var barcodeImage = data.barcodeImage;
document.getElementById("barcodeImage").src = barcodeImage;
}
else {
alert(data.errorMessage);
}
}
/**
* Barcode generation is failed.
*/
function __writeBarcode_failed(data) {
// show information about error
alert(data.errorMessage);
}
// set the session identifier
Vintasoft.Shared.WebImagingEnviromentJS.set_SessionId("SessionID");
// generate image of QR barcode with value "12345"
generate2dBarcodeImage("QR", "12345");
</script>
-
Run the ASP.NET Core application and see the result.
