//省略部分代码...
//代码生成相关
  "CodeCreatorInfo": {
    "xmlPath": "11111", //xml路径(绝对路径)
    "jsRootPaht": "2222", //js文件夹路径
    "Controllers": "333", //特殊Controller列表，逗号隔开
    "NameSpace": "4444" //有效命名空间："App.Web."之后的内容，主要用于多项目的项目，以逗号分隔，例如：APIControllers1，APIControllers2
  } 
//省略部分代码...

 1、引用库

using Microsoft.Extensions.Configuration;

2、使用接口服务：IConfiguration

注：观察这个类，这已经被 CodeCreatorController 自动注入了，无需手动做注入操作

using Microsoft.Extensions.Configuration;

namespace App.Web.APIControllers
{
    /// <summary>
    /// js代码生成接口
    /// </summary>
    [Route("api/[controller]/[action]")]
    [ApiController]
    public class CodeCreatorController : BaseAPIController1
    {
        /// <summary>
        /// 自动注入
        /// </summary>
        /// <param name="configuration"></param>
        public CodeCreatorController(IConfiguration configuration)
        {
            _configuration = configuration;
        }
        public IConfiguration _configuration { get; }


        /// <summary>
        /// 获取XML文档内容，生成js文件内容，生成两种，分别用于页面和小程序
        /// </summary>
        [HttpGet]
        public JsonResult CreateJsByXML()
        {
            //获取appsettiong配置内容
            var CodeCreatorInfo = _configuration.GetSection("CodeCreatorInfo");
            string xmlPath = _configuration.GetSection("CodeCreatorInfo")["xmlPath"];
            
            /*
            省略部分代码            
            */
        }
    }
}

方法二：在.net core 类库中读取json文件

 1、添加引用：

using System.Configuration;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;

/// <summary>
    /// 获取appsetting的服务类
    /// </summary>
    public class AppConfigurtaionServices
    {
        public static IConfiguration Configuration { get; set; }
        static AppConfigurtaionServices()
        {
            //ReloadOnChange = true 当appsettings.json被修改时重新加载            
            Configuration = new ConfigurationBuilder()
            //.SetBasePath(Directory.GetCurrentDirectory())
            //AppDomain.CurrentDomain.BaseDirectory是程序集基目录，所以appsettings.json,需要复制一份放在程序集目录下，
            .SetBasePath(AppDomain.CurrentDomain.BaseDirectory)
            .Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })
            .Build();
        }
    }

/*省略部分代码*/ 
//类库中读取:两种取值方式【OK】
var xmlPath = AppConfigurtaionServices.Configuration.GetSection("CodeCreatorInfo:xmlPath").Value;
var jsRootPaht = AppConfigurtaionServices.Configuration.GetSection("CodeCreatorInfo").GetSection("jsRootPaht").Value;
var Controllers = AppConfigurtaionServices.Configuration.GetSection("CodeCreatorInfo").GetSection("Controllers").Value;
var NameSpace = AppConfigurtaionServices.Configuration.GetSection("CodeCreatorInfo").GetSection("NameSpace").Value;
var ControllersArray = Controllers.Split(',');
var NameSpaceArray = NameSpace.Split(',');
/*省略部分代码*/