Sponsor: Do you build complex software systems? See how NServiceBus makes it easier to design, build, and manage software systems that use message queues to achieve loose coupling. Get started for free.I recently presented at the Windsor-Essex .NET Developers group on getting started with ASP.NET Core and VS Code. The intent was just to show how you can step outside of Visual Studio and create a Hello World application using the .NET Core CLI and VS Code.
Video Walk ThroughI’ve created a short video which explains everything this post will, so if you prefer video walk through this is for you:
5 Easy StepsFor the purpose of my demo, I was using Windows. I plan on creating a similar video for if you are on Mac or Linux, so if you are, stay tuned for those. If you are Windows, it’s really easy to get started.
.NET Core SDKThe first thing you need is the .NET Core SDK for Windows. The new vanity domain for .Net is now dot.net If you head on over there, you can download .NET Core SDK for Windows. There are a other downloads on this page, specifically you can get the Visual Studio Update which will include .NET Core. For the purpose of my example, since the intent is NOT to use full blown Visual Studio, just download the .NET Core SDK For Windows. You can install the SDK with all the defaults.
VS CodeNext is getting VS Code (Visual Studio Code). Head on over to https://code.visualstudio.com and download the latest. VS Code is on a monthly release cadence and is improving greatly with each release. I’m enjoying it so much I’ve turned it into my default text editor. You can install VS Code with all the defaults.
.NET Core CLIThe Command Line Interface (aka CLI) is new to .NET Core. The CLI gives you the ability to create new projects (think yeoman), build/compile, run, package and more. To create a new ASP.NET Core application, in a new empty folder, from the command prompt or powershell:
dotnet new -t webThis will create a new ASP.NET web application template with all the necessary files. the “-t web” portion of the command is specifying that you want to generate an application using the web template. In the new world of .NET Core, everything is packaged via NuGet. Because of this, you need to download all the relevant packages for the ASP.NET Core.
dotnet restoreThis will download and cache all the nuget packages. If you run this again, it will not re-download from the internet as there are local cached copies.
VS CodeNow that you have a new project setup, open up VS Code in the folder of your new project. If you are on the command prompt still you can simply type:
code .Once VS Code opens, it will notice you have a C# project. After a several seconds there will be a dialog at the top: “Required assets to build and debug are missing from your project. Add them?” This is asking you to install the C# (Omnisharp) extension. Click Yes to have it installed. Once installed, if you open up any .cs file, you will see in the status bar that it recognizes its a C# file and there is a fire icon which means Omnisharp is running. You will also notice your file has syntax highlighting, intellisense and more.