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If you're confused by all this naming, no worries! We'll get to some real
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code in a bit.
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A note to ASP.NET 4 developers
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If you haven't used a previous version of ASP.NET, skip ahead to the
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next chapter.
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8
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Introduction
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ASP.NET Core is a complete ground-up rewrite of ASP.NET, with a focus
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on modernizing the framework and finally decoupling it from
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System.Web, IIS, and Windows. If you remember all the OWIN/Katana
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stuff from ASP.NET 4, you're already halfway there: the Katana project
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became ASP.NET 5 which was ultimately renamed to ASP.NET Core.
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Because of the Katana legacy, the Startup class is front and center, and
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there's no more Application_Start or Global.asax . The entire pipeline
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is driven by middleware, and there's no longer a split between MVC and
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Web API: controllers can simply return views, status codes, or data.
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Dependency injection comes baked in, so you don't need to install and
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configure a container like StructureMap or Ninject if you don't want to.
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And the entire framework has been optimized for speed and runtime
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efficiency.
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Alright, enough introduction. Let's dive in to ASP.NET Core!
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9
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Your first application
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Your first application
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Ready to build your first web app with ASP.NET Core? You'll need to
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gather a few things first:
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Your favorite code editor. You can use Atom, Sublime, Notepad, or
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whatever editor you prefer writing code in. If you don't have a favorite,
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give Visual Studio Code a try. It's a free, cross-platform code editor that
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has rich support for writing C#, JavaScript, HTML, and more. Just search
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for "download visual studio code" and follow the instructions.
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If you're on Windows, you can also use Visual Studio to build ASP.NET
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Core applications. You'll need Visual Studio 2017 version 15.3 or later
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(the free Community Edition is fine). Visual Studio has great code
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completion and refactoring support for C#, although Visual Studio Code
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is close behind.
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The .NET Core SDK. Regardless of the editor or platform you're using,
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you'll need to install the .NET Core SDK, which includes the runtime,
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base libraries, and command line tools you need for building ASP.NET
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Core applications. The SDK can be installed on Windows, Mac, or Linux.
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Once you've decided on an editor, you'll need to get the SDK.
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10
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Get the SDK
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Get the SDK
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Search for "download .net core" and follow the instructions on
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Microsoft's download page to get the .NET Core SDK. After the SDK has
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finished installing, open up the Terminal (or PowerShell on Windows) and
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use the dotnet command line tool (also called a CLI) to make sure
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everything is working:
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dotnet --version
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