C# 7 and .NET Core 2.0 High Performance

Compatibility mode

Although more than 33K APIs have been added into .NET Standard 2.0, many of the NuGet packages still target .NET Framework, and moving them to .NET Standard is not possible, since their dependencies are still not targeted at .NET Standard. However, with .NET Standard 2.0, we can still add packages which show a warning but don't block adding those packages into our .NET Standard library.

Under the hood, .NET Standard 2.0 uses compatibility shim, which solves the third party library compatibility issue and makes it easy in referencing those libraries. In the CLR world, the identity of the assembly is part of the type identity. This means that when we say System.Object in .NET Framework, we are referencing [mscorlib]System.Object ...