Asp.NetCore 读取配置文件帮助类

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/// <summary>     /// 读取配置文件信息     /// </summary>     public class ConfigExtensions     {         public static IConfiguration Configuration { get; set; }         static ConfigExtensions()         {             Configuration = new ConfigurationBuilder()                  .Add(new JsonConfigurationSource { Path = "appsettings.json", ReloadOnChange = true })                  .Build();         }         /// <summary>         /// 获得配置文件的对象值         /// </summary>         /// <param name="jsonPath"></param>         /// <param name="key"></param>         /// <returns></returns>         public static string GetJson(string jsonPath, string key)         {             if (string.IsNullOrEmpty(jsonPath) || string.IsNullOrEmpty(key)) return null;             IConfiguration config = new ConfigurationBuilder().AddJsonFile(jsonPath).Build();//json文件地址             return config.GetSection(key).Value;//json某个对象         }         /// <summary>         /// 根据配置文件和Key获得对象         /// </summary>         /// <typeparam name="T"></typeparam>         /// <param name="fileName">文件名称</param>         /// <param name="key">节点Key</param>         /// <returns></returns>         public static T GetAppSettings<T>(string fileName, string key) where T : class, new()         {             if (string.IsNullOrEmpty(fileName) || string.IsNullOrEmpty(key)) return null;             var baseDir = AppContext.BaseDirectory + "json/";             var currentClassDir = baseDir;                IConfiguration config = new ConfigurationBuilder()                 .SetBasePath(currentClassDir)                 .Add(new JsonConfigurationSource                 {                     Path = fileName,                     Optional = false,                     ReloadOnChange = true                 }).Build();             var appconfig = new ServiceCollection().AddOptions()                .Configure<T>(config.GetSection(key))                .BuildServiceProvider()                .GetService<IOptions<T>>()                .Value;             return appconfig;         }            /// <summary>         /// 获取自定义配置文件配置         /// </summary>         /// <typeparam name="T">配置模型</typeparam>         /// <param name="key">根节点</param>         /// <param name="configPath">配置文件名称</param>         /// <returns></returns>         public T GetAppSettingss<T>(string key, string configPath) where T : class, new()         {             if (string.IsNullOrEmpty(key) || string.IsNullOrEmpty(configPath)) return null;             IConfiguration config = new ConfigurationBuilder().Add                 (new JsonConfigurationSource { Path = configPath, ReloadOnChange = true }).Build();             var appconfig = new ServiceCollection()                 .AddOptions()                 .Configure<T>(config.GetSection(key))                 .BuildServiceProvider()                 .GetService<IOptions<T>>()                 .Value;             return appconfig;         }         /// <summary>         /// 获取自定义配置文件配置（异步方式）         /// </summary>         /// <typeparam name="T">配置模型</typeparam>         /// <param name="key">根节点</param>         /// <param name="configPath">配置文件名称</param>         /// <returns></returns>         public async Task<T> GetAppSettingsAsync<T>(string key, string configPath) where T : class, new()         {             if (string.IsNullOrEmpty(key) || string.IsNullOrEmpty(configPath)) return null;             IConfiguration config = new ConfigurationBuilder()                 .Add(new JsonConfigurationSource                 {                     Path = configPath,                     ReloadOnChange = true                 }).Build();             var appconfig = new ServiceCollection()                 .AddOptions()                 .Configure<T>(config.GetSection(key))                 .BuildServiceProvider()                 .GetService<IOptions<T>>()                 .Value;             return await Task.Run(() => appconfig);         }         /// <summary>         /// 获取自定义配置文件配置         /// </summary>         /// <typeparam name="T">配置模型</typeparam>         /// <param name="key">根节点</param>         /// <param name="configPath">配置文件名称</param>         /// <returns></returns>         public List<T> GetListAppSettings<T>(string key, string configPath) where T : class, new()         {             if (string.IsNullOrEmpty(key) || string.IsNullOrEmpty(configPath)) return null;             IConfiguration config = new ConfigurationBuilder()                 .Add(new JsonConfigurationSource { Path = configPath, ReloadOnChange = true }).Build();             var appconfig = new ServiceCollection()                 .AddOptions()                 .Configure<List<T>>(config.GetSection(key))                 .BuildServiceProvider()                 .GetService<IOptions<List<T>>>()                 .Value;             return appconfig;         }            /// <summary>         /// 获取自定义配置文件配置（异步方式）         /// </summary>         /// <typeparam name="T">配置模型</typeparam>         /// <param name="key">根节点</param>         /// <param name="configPath">配置文件名称</param>         /// <returns></returns>         public async Task<List<T>> GetListAppSettingsAsync<T>(string key, string configPath) where T : class, new()         {             if (string.IsNullOrEmpty(key) || string.IsNullOrEmpty(configPath)) return null;             IConfiguration config = new ConfigurationBuilder()                 .Add(new JsonConfigurationSource { Path = configPath, ReloadOnChange = true })                 .Build();             var appconfig = new ServiceCollection()                 .AddOptions()                 .Configure<List<T>>(config.GetSection(key))                 .BuildServiceProvider()                 .GetService<IOptions<List<T>>>()                 .Value;             return await Task.Run(() => appconfig);         }     }