OnConfiguring Context method from NetCore

Context.cs

 protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
                IConfigurationRoot configuration = new ConfigurationBuilder()
                    .SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
                    .AddJsonFile("appsettings.json")
                    .Build();

                optionsBuilder.UseMySql(configuration.GetConnectionString("MicrobiologiaDatabase"));
            }
        }