And if not, will it be? If so, when?
I haven't been able to find any clear official information on this, and the limited information I was able to find on Stack Overflow is a year or two old.
I was able to find official information saying EF 6.3 will be able to be used in a .NET Core project, but I couldn't find a release date for it, nor am I sure what the implications for use in a .NET Standard project are.
.NET Standard projects are not executable.
EF 6 supports .NET Standard 2.1, which is currently supported by .NET Core 3.0, and also .NET 4.5 or later.
Some clarification, since
.NET Standard 2.1 has been supported. However there is no
.NET Framework version that supports
.NET Standard 2.1. Comment from Microsoft:
NET Framework won't support .NET Standard 2.1 or later versions. For more details, see the announcement of .NET Standard 2.1.
This means that a majority of all applications using
EntityFramework 6.X won't be able to use the
.NET Standard 2.1 project anyway.