If you’re using Entity Framework Core with the database first approach and re-scaffold you’ll see that by default EF Core will create an OnConfiguring overload with a connection string so that the context is immediately usable.
In EF Core 5.0 if you already have your connection string defined in Startup.cs -> ConfigureServices like the first image below or through some other approach you can now suppress the output of OnConfiguring in the generated DbContext class.
The relevant flag is..
-NoOnConfiguring for the package manager console
–no-onConfiguring for the CLI approach
