netcore 非注入全局获取配置文件

在netcore开发中，最常见的就是注入，比如想获取appsettings.json的内容，我们就需要去注入，然后在controller里面去获取，但是我们如果想要在service中使用appsettings.json的内容，这样就是一个问题，并且每个controller去注入也是非常麻烦的事情

下面的注入的（这种方法百度一下可以出来几百条相同的搜索结果。。。参见https://www.cnblogs.com/ideacore/p/6282926.html）

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

然后获取使用

我想要在service类库里面使用，这时该如何使用哪？

直接上代码：

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "AppSettings": {
    "TestString": "This is default environment",
    "ConfigVersion": "local",
    "connectionString": "connectionString",
    "RedisExchangeHosts": "RedisExchangeHosts"
  }
}

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;
            // 将内置的日志组件设置为 NHibernate 的日志组件
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)//增加环境配置文件，新建项目默认有
                .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"]
            };
        }

    }

这样，我们在要使用的时候只需要AppSettingProvider._appSettings.xxxx即可，不需要进行重复的、实现

有错误或者片面地方欢迎指正