netcore 非註入全局獲取配置文件

在netcore開發中，最常見的就是註入，比如想獲取appsettings.json的內容，我們就需要去註入，然後在controller裡面去獲取，但是我們如果想要在service中使用appsettings.json的內容，這樣就是一個問題，並且每個controller去註入也是非常麻煩的事情

下麵的註入的（這種方法百度一下可以出來幾百條相同的搜索結果。。。參見https://www.cnblogs.com/ideacore/p/6282926.html）

services.AddOptions();
services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));

然後獲取使用

我想要在service類庫裡面使用，這時該如何使用哪？

直接上代碼：

    public class AppSettings
    {
        public string TestString { get; set; }
        public string ConfigVersion { get; set; }
        public string connectionString { get; set; }
        public string RedisExchangeHosts { get; set; }
        public string UploadPath { get; set; }
    }

        public Startup(IConfiguration configuration, ILoggerFactory factory, IHostingEnvironment env)
        {
            EnvironmentName = env.EnvironmentName;
            Configuration = configuration;
            // 將內置的日誌組件設置為 NHibernate 的日誌組件
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)//增加環境配置文件，新建項目預設有
                .AddEnvironmentVariables();

            new AppSettingProvider().Initial(configuration);

            Configuration = builder.Build();

        }

    public class AppSettingProvider
    {
        private static AppSettings _myappSettings;
        public static AppSettings _appSettings { get { return _myappSettings; } }

        public void Initial(IConfiguration configuration)
        {
            _myappSettings =  new AppSettings() {
                ConfigVersion = configuration["AppSettings:ConfigVersion"],
                connectionString = configuration["AppSettings:connectionString"],
                TestString = configuration["AppSettings:TestString"],
                RedisExchangeHosts = configuration["AppSettings:RedisExchangeHosts"],
                UploadPath = configuration["AppSettings:UploadPath"]
            };
        }

    }

這樣，我們在要使用的時候只需要AppSettingProvider._appSettings.xxxx即可，不需要進行重覆的、實現

有錯誤或者片面地方歡迎指正