Only Set Connection String in OnConfiguring for EF Core

gistfile1.txt

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            //Generically set the connection string regardless of .UseSqlServer/.UsePgSQL/etc.
            var relationalOptions = optionsBuilder.Options.FindExtension<RelationalOptionsExtension>();
            optionsBuilder.Options.WithExtension(relationalOptions.WithConnectionString(_connectionString));
        }

This doesn't work. You can check if the connection string is set this way, but it won't actually update it.