如何在剃刀页面项目中从appsettings.json读取ConnectionString

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=myServerAddress;Database=myDataBase;User Id=myUsername;Password=myPassword;"
  }
}

public void ConfigureServices(IServiceCollection services)
{
    // 读取appsettings.json文件中的配置项
    var connectionString = Configuration.GetConnectionString("DefaultConnection");

    // 注册数据库上下文
    services.AddDbContext<ApplicationDbContext>(options =>
        options.UseSqlServer(connectionString));

    // 其他服务的注册...
}

public class MyService
{
    private readonly string _connectionString;

    public MyService(IConfiguration configuration)
    {
        _connectionString = configuration.GetConnectionString("DefaultConnection");
    }

    // 使用_connectionString进行数据库操作...
}