{

   "ConnectionStrings": {

     "StudyConnStr": "Data Source=.;Initial Catalog=Study;User ID=sa;Password=admin"

   }

 }

 using Microsoft.Extensions.Configuration;

 using System;

 using System.IO;

 namespace Config_Test

 {

     class Program

     {

         static void Main(string[] args)

         {

             var build = new ConfigurationBuilder();

             build.SetBasePath(Directory.GetCurrentDirectory());

             build.AddJsonFile("//Config//dbconfig.json", true, true);

             var dbConfig = build.Build();

             string dbConn = dbConfig.GetSection("ConnectionStrings").GetSection("StudyConnStr").Value;

             Console.WriteLine($"db连接字符串：{dbConfig["ConnectionStrings:StudyConnStr"]}");

             Console.WriteLine($"db连接字符串：{dbConn}");

             Console.ReadKey();

         }

     }

 }