Using EF Core and EF6 in the Same Application
It is possible to use EF Core and EF6 in the same .NET Framework application or library by installing both NuGet packages.
Some types have the same names in EF Core and EF6 and differ only by namespace, which may complicate using both EF Core and EF6 in the same code file. The ambiguity can be easily removed using namespace alias directives. For example:
using Microsoft.EntityFrameworkCore; // use DbContext for EF Core using EF6 = System.Data.Entity; // use EF6.DbContext for the EF6 version
If you are porting an existing application that has multiple EF models, you can choose to selectively port some of them to EF Core, and continue using EF6 for the others.