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Table of Contents

Introduction

In this article, We will explain how to Install a .NET Core tools preview for Visual Studio and how to print “Hello World” in the latest Asp.Net Core 1.0.

Step 1

First download Visual Studio 2015 with Update 3 through the link click here.

Step 2

Go to Install .NET Core tools preview for Visual Studio. This .NET Core tool adds support for .NET Core projects in Visual Studio 2015.

Step 3

This is really interesting !! Open Visual Studio 2015 and create a new Project.

Open Templates – > Visual C# -> Click .NET Core Category and you can see “ASP.NET Core Web Application” template.

Step 4

Select Empty Templates ( based on your requirement ) in Asp.Net Core Templates Category. If you are going to host the app in Microsoft Azure Service and check in the “Host in the cloud option”.

Step 5

Open “Startup.cs” class in “HelloWorldDotnetCore” project folder.

Step 6

We are creating a mini middle ware Application, using a lambda expression in “app.Run”. This piece of code is creating “Hello World”

C# Code

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;
using Microsoft.Extensions.Logging;
  
namespace HelloWorldDotnetCore
{
    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 http://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, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole();
  
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
           app.Run(async (context) =>
            {
                await context.Response.WriteAsync(" Hello World!");
            });
             
        }
    }
}

Output 1


Step 7

Two “app.run” doesn’t work in .Net Core followed by using “app.Use”. It will pass two parameters and Add the next middleware content in .Net Core.

C# Code:

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;
using Microsoft.Extensions.Logging;
  
namespace HelloWorldDotnetCore
{
    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 http://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, ILoggerFactory loggerFactory)
        {
            loggerFactory.AddConsole();
  
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            app.Use(async (context, next) =>
            {
                await context.Response.WriteAsync("Hello World!!");
                await next();
            });
  
            app.Run(async (context) =>
            {
                await context.Response.WriteAsync(" Welcome to Dotnet Core ");
            });
             
        }
    }
}

Output 2

Conclusion

We learned how to Install .NET Core tools preview for Visual Studio and how to print “Hello World” in the latest ASP.NET Core 1.0.