Any way to detect if EntityFramework Core is run inside a tool?

Question

Is there any way to detect if my application is being run through dotnet ef * or the PowerShell alternatives?

I'm creating a multi-tenant ASP.NET Core app with Entity Framework Core and I have logic to decide which connection string should be used, but should not be run if I'm creating migrations or updating a database through the command line. I cannot rely on checking for the existance of an HttpContext because I use my DbContext during configuration as well, nor can I use additional command line arguments or environment variables.

EDIT: Found a way to see if a connection string has already been configured, it's not ideal but I can use it to help with my particular use case:

optionsBuilder.Options.Extensions
    .OfType<RelationalOptionsExtension>()
    .FirstOrDefault()?.ConnectionString

Answer 1

If you create a type that implements IDbContextFactory<T> in your DbContext (or startup) project, the tools will call this instead of trying get your DbContext from services or instantiate it directly.