Net6读取AppSettings.json

1、创建Helper类
 public class AppHelper
    {
        private static IConfiguration _config;

        public AppHelper(IConfiguration configuration)
        {
            _config = configuration;
        }

        /// <summary>
        /// 读取指定节点的字符串
        /// </summary>
        /// <param name="sessions"></param>
        /// <returns></returns>
        public static string ReadAppSettings(params string[] sessions)
        {
            try
            {
                if (sessions.Any())
                {
                    return _config[string.Join(":", sessions)];
                }
            }
            catch
            {
                return "";
            }
            return "";
        }

        /// <summary>
        /// 读取实体信息
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="session"></param>
        /// <returns></returns>
        public static List<T> ReadAppSettings<T>(params string[] session)
        {
            List<T> list = new List<T>();
            _config.Bind(string.Join(":", session), list);
            return list;
        }
    }

2、在Program.cs注入

var builder = WebApplication.CreateBuilder(args);

IConfiguration configuration = new ConfigurationBuilder()
.AddJsonFile("appsettings.json")
.Build();

builder.Services.AddSingleton(new AppHelper(configuration));

3、appsettings.json 

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  //默认参数值
  "AbCd": 1,
  "AbCdE": "2"
}

4、使用

        string AbCd = AppHelper.ReadAppSettings("AbCd");// 
        string AbCdE = AppHelper.ReadAppSettings("AbCdE");//