var builder = new ConfigurationBuilder()
.SetBasePath(env.ContentRootPath)
.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
.AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
.AddEnvironmentVariables();

Configuration = builder.Build();
var value = Configuration["Section:Key"]

services.Configure<DatabaseOption>(configuration.GetSection("Database"));

public EntityFrameWorkConfigure(IOptions<DatabaseOption> dataBaseOption)
{
_dataBaseOption = dataBaseOption;
}

public EntityFrameWorkConfigure(IOptionsSnapshot<DatabaseOption> dataBaseOption)
{
_dataBaseOption = dataBaseOption;
}