What is .NET Standard?

The Discussion

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  That's a great intro. Thanks Seth. I've started using .net standard in my Xamarin projects, but still don't fully understand what  "Microsoft.NETCore.Portable.Compatibility" and "NETStandard.Library" are. Any videos explaining these would be much appreciated. 

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  Am I understanding this right, an Xamarin App will run on windows ( with any needed windows renderers ) on the basis that Xamarin API's are inside .net standard?

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  14 hours ago, raghurana wrote

  I don't fully understand what  "Microsoft.NETCore.Portable.Compatibility" and "NETStandard.Library" are.

  
  
  Microsoft.NETCore.Portable.Compatibility is a NuGet package that provides the magic that makes your project compatible with existing Portable Class Libraries (PCL). PCLs were our solution to create class libraries that can be shared across multiple .NET flavors, prior to .NET Standard.

  NETStandard.Library that's the NuGet package that you reference to build a class library targeting .NET Standard 1.x.

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  11 hours ago

  Am I understanding this right, an Xamarin App will run on windows ( with any needed windows renderers ) on the basis that Xamarin API's are inside .net standard?

  
  
  No. Xamarin provides .NET flavors that allow you to run apps on iOS and Android. We don't have any plans to add a UI stack to .NET Standard. UI is a platform specific technology.

  Xamarin Forms is an abstraction over the platform specific UI stacks that allows you to share UIs across different operating systems.

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  So for ease of understanding, is it OK to think of .NET Standard as the spec and .NET Core as one of it's implementation?
  Also, there seems to be some difference as to how .NET Core is represented in terms of architecture - does the Standard replace the Core's place in the first diagram in this link?
  
  https://blogs.msdn.microsoft.com/bethmassi/2015/02/25/understanding-net-2015/

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  How it differs from BCL/CLS

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  So is it correct to say .net core is a subset of .net framework? They seem to be parallel to each other.