[C#/ASP.NET MVC/.NETCORE] IHostBuilder 인터페이스 : ConfigureAppConfiguration 메소드에서 appsettings.json 파일 설정 값 구하기

▶ appsettings.json

{
    "Logging" :
    {
        "LogLevel" :
        {
            "Default"                    : "Information",
            "Microsoft"                  : "Warning",
            "Microsoft.Hosting.Lifetime" : "Information"
        }
    },
    "AllowedHosts" : "*",
    "ConnectionStrings" :
    {
        "DefaultConnection" : "Data Source=(localdb)\\MSSQLLocalDB;Initial Catalog=TestDB;Integrated Security=True;"
    }
}

 

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▶ Program.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;

namespace TestProject
{
    /// <summary>
    /// 프로그램
    /// </summary>
    public class Program
    {
        //////////////////////////////////////////////////////////////////////////////////////////////////// Method
        ////////////////////////////////////////////////////////////////////////////////////////// Static
        //////////////////////////////////////////////////////////////////////////////// Public

        #region 프로그램 시작하기 - Main(argumentArray)

        /// <summary>
        /// 프로그램 시작하기
        /// </summary>
        /// <param name="argumentArray">인자 배열</param>
        public static void Main(string[] argumentArray)
        {
            CreateHostBuilder(argumentArray).Build().Run();
        }

        #endregion
        #region 호스트 빌더 생성하기 - CreateHostBuilder(argumentArray)

        /// <summary>
        /// 호스트 빌더 생성하기
        /// </summary>
        /// <param name="argumentArray">인자 배열</param>
        /// <returns>호스트 빌더</returns>
        public static IHostBuilder CreateHostBuilder(string[] argumentArray) =>
            Host.CreateDefaultBuilder(argumentArray)
                .ConfigureAppConfiguration
                (
                    (context, builder) =>
                    {
                        var root = builder.AddJsonFile("appsettings.json", optional : true, reloadOnChange : true).Build();
                   
                        string connectionString = root.GetConnectionString("DefaultConnection");

                        builder.AddEFConfiguration(options => options.UseSqlServer(connectionString));
                    }
                )
                .ConfigureWebHostDefaults
                (
                    builder =>
                    {
                        builder.UseStartup<Startup>();
                    }
                );

        #endregion
    }
}