.net core 配制文件读取操作

 /// <summary>
    /// 配制文件读取类
    /// </summary>
    public static class ConfigHelper
    {
        private static IConfiguration _configuration;

        static ConfigHelper()
        {
            //在当前目录或者根目录中寻找appsettings.json文件
            var fileName = "appsettings.json";

            var directory = AppContext.BaseDirectory;
            directory = directory.Replace("\\", "/");

            var filePath = $"{directory}/{fileName}";
            if (!File.Exists(filePath))
            {
                var length = directory.IndexOf("/bin");
                filePath = $"{directory.Substring(0, length)}/{fileName}";
            }

            var builder = new ConfigurationBuilder()
                .AddJsonFile(filePath, false, true);

            _configuration = builder.Build();
        }
        /// <summary>
        /// 获取配制文件节点
        /// </summary>
        /// <param name="key">配制文件路由KEY</param>
        /// <returns></returns>
        public static string GetSectionValue(string key)
        {

            return _configuration.GetSection(key).Value;

        }
        /// <summary>
        /// 获取配制文件KEY为ConnctionStrings中的KEY值
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string GetConnctionString(string key)
        {

            return _configuration.GetConnectionString($"ConnctionString:{key}");
        }
        /// <summary>
        /// 获取配制文件中key为AppSetting中的KEY
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public static string AppSetting(string key)
        {
            return _configuration.GetSection($"AppSetting:{key}").Value;
        }
    }