.NET Core 获取配置文件appsettings.json 方法

using Abp.Extensions;
using Microsoft.Extensions.Configuration;
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SiXun.BossHelper.Helper
{
    public static class AppConfigurations
    {
        private static readonly ConcurrentDictionary<string, IConfigurationRoot> _configurationCache;

        static AppConfigurations()
        {
            _configurationCache = new ConcurrentDictionary<string, IConfigurationRoot>();
        }

        public static IConfigurationRoot Get(string path, string environmentName = null, bool addUserSecrets = false)
        {
            var cacheKey = path + "#" + environmentName + "#" + addUserSecrets;
            return _configurationCache.GetOrAdd(
                cacheKey,
                _ => BuildConfiguration(path, environmentName, addUserSecrets)
            );
        }

        private static IConfigurationRoot BuildConfiguration(string path, string environmentName = null, bool addUserSecrets = false)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(path)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);

            if (!environmentName.IsNullOrWhiteSpace())
            {
                builder = builder.AddJsonFile($"appsettings.{environmentName}.json", optional: true);
            }

            builder = builder.AddEnvironmentVariables();
            return builder.Build();
        }
    }
}

 using Microsoft.Extensions.Configuration;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;

 namespace SiXun.BossHelper.Helper
 {
     public static class ConfigHelper
     {
         private static IConfigurationRoot _appConfiguration = AppConfigurations.Get(System.Environment.CurrentDirectory);

         //用法1(有嵌套)：GetAppSetting("Authentication", "JwtBearer:SecurityKey")
         //用法2：GetAppSetting("App", "ServerRootAddress")
         public static string GetAppSetting(string section, string key)
         {

             return _appConfiguration.GetSection(section)[key];
         }

         public static string GetConnectionString(string key)
         {
             return _appConfiguration.GetConnectionString(key);
         }

         //public static T GetValue<T>(string key)
         //{
         //    return _appConfiguration.Get<T>(key);
         //}
     }
 }

private readonly string AppId = ConfigHelper.GetAppSetting("App", "AppID");
private readonly string AppSecret = ConfigHelper.GetAppSetting("App", "AppSecret");