Creating a new application ASP.NET Core

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Creating a new application ASP.NET Core

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Creating a new application ASP.NET Core

last updated: 31 October 2025

Plan (4 steps)

Step 1.

Open Visual Studio

Step 2.

Create a blank app ASP.NET Core

Step 3.

Project Structure ASP.NET Core

Step 4.

Run the application ASP.NET Core

Step 1. Open Visual Studio

If you do not have Visual Studio installed you need install Visual Studio...

Open Visual Studio 2022

Open Visual Studio 2019

Step 2. Create a blank app ASP.NET Core

Click in the menu: File → New → Project → Visual C# → ASP.NET Core Web Application

Here we are offered to choose the type of project:

Empty

a blank template with the least functionality for creating applications from scratch

Web API

Web Service Project

Web Application

the project uses requests to process requests Razor Pages

Web Application (Model-View-Controller)

the project uses architecture MVC

Angular

the project is designed to work with Angular 2+

Reat.js

the project uses React.JS

Reat.js and Redux

the project uses React.JS and Redux

Razor Class Library

a project for creating a class library Razor

We can specify the version ASP.NET Core in the drop-down list. In our case, let's leave the default value ASP.NET Core 2.1.

You can also specify the default authentication type in your project and attach the container Docker.

See also "Configure HTTP". if you select this check box the project will run by protocol by default when debugging and testing HTTPS. In this case, selecting or not selecting this check box is irrelevant. In addition, even if we have set this mark, then later through the project properties we can cancel the launch through HTTPS or, conversely, reinstall.

Among these templates, let's choose Empty. Leave all other values to the default and click on the button OK . And Visual Studio 2017 creates a new project:

Step 3. Project Structure ASP.NET Core

• Connected Services

connected services from Azure

• Dependencies

packages and libraries added to the project (dependencies)

• Properties

To run project settings

json {rus}файл{/rus} launchSettings.json

{
     "iisSettings": {
          "windowsAuthentication": false,
          "anonymousAuthentication": true,
          "iisExpress": {
               "applicationUrl": "http://localhost:51459",
               "sslPort": 44390
          }
     },
     "profiles": {
          "IIS Express": {
               "commandName": "IISExpress",
               "launchBrowser": true,
               "environmentVariables": {
                    "ASPNETCORE_ENVIRONMENT": "Development"
               }
          },
          "WebApplication1": {
               "commandName": "Project",
               "launchBrowser": true,
               "applicationUrl": "https://localhost:5001;http://localhost:5000",
               "environmentVariables": {
                    "ASPNETCORE_ENVIRONMENT": "Development"
               }
          }
     }
}

wwwroot

To store files: images, javascript, css, etc., which are used by the application. [konec_stroki] The purpose of this folder is to differentiate access (allow and deny access from the client).

Program.cs

The main application file. This file starts the execution of the program. [konec_stroki] The file code configures and starts the web host within which the application is deployed.

Startup.cs

The file contains a class Startup . The class contains logic for processing incoming requests.

Step 4. Run the ASP.NET Core app

Click on the green triangle at the top

Select the checkmark to agree to create a certificate ssl

In the browser we will see the result
"Hello World!"

Text Hello Word! this is the customer's response (variable Response u class Startup)

C# File Startup.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;

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)
          {
          }

          // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
          public void Configure(IApplicationBuilder app, IHostingEnvironment env)
          {
               if (env.IsDevelopment())
               {
                    app.UseDeveloperExceptionPage();
               }

               app.Run(async (context) =>
               {
                    await context.Response.WriteAsync("Hello World!");
               });
          }
     }
}

Файл Program.cs (оставим без изменений)

C# File Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace WebApplication1
{
     public class Program
     {
          public static void Main(string[] args)
          {
               CreateWebHostBuilder(args).Build().Run();
          }

          public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
               WebHost.CreateDefaultBuilder(args)
                    .UseStartup<Startup>();
     }
}

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