dotNetCore v2-配置文件热加载

using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Generic;

namespace MyFirstConsole
{
    class Program
    {
        static void Main(string[] args)
        {
            IConfiguration configuration = new ConfigurationBuilder().SetBasePath(Environment.CurrentDirectory)
                .AddJsonFile("appsettings.json",optional:false,reloadOnChange:true)
                .Build();
            var info = configuration["username"];

            Console.WriteLine(info);
            Console.WriteLine("Hello World!");
        }
    }
}