.NET Framework、.NETportable 和 .NET Standard

Question

What is actually the difference between these three? I understand .NET portable is obsolete, pretty much, but what about the other two.

Answer 1

.NET Standard is an interface while .NET Framework is an implementation of that interface. NET Core is another implementation of NET Standard. This makes it so that when creating libraries you can target NET Standard instead of any of the above mentioned implementations making the library available to both NET Framework and NET Core.

Answer 2

Actually it looks to me that .NETStandard is the formal standard to which .NETFramework, and lately .NETCore, adheres.

To quote from here: https://docs.microsoft.com/en-us/dotnet/standard/net-standard

The .NET Standard is a formal specification of .NET APIs that are intended to be available on all .NET implementations.

The .NET Framework 4.6 implements .NET Standard 1.3, which means that it exposes all APIs defined in .NET Standard versions 1.0 through 1.3. Similarly, the .NET Framework 4.6.1 implements .NET Standard 1.4, while .NET Core 1.0 implements .NET Standard 1.6.