dotnet core(读取配置文件)

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{
    "MySQLConnectionString": "server=mysql地址;port=端口号;database=数据库名字;uid=账号;pwd=密码;charset='utf-8';Allow User Variables=True;Connection Timeout=30;SslMode=None;",
    "RedisConnectionString": "redis数据库地址:端口,name=名字,keepAlive=1800,syncTimeout=10000,connectTimeout=360000,password=访问密码,ssl=False,abortConnect=False,responseTimeout=360000,defaultDatabase=1",
    "EmailAccount": "QQ邮箱账号",
    "EmailPassword": "QQ邮箱密码",
    "EmailSMTPDomain": "smtp.qq.com",
    "EmailSMTPPort": 587,
    "SenderAddress": "QQ邮箱账号",
    "ReceiverAddress": "QQ邮箱账号",
    "ReceiverName": "liguobao-test",
    "EncryptionConfigCIV": "加密向量,16个16进制数字",
    "EncryptionConfigCKEY": "加密秘钥,16个16进制数字",
    "ESURL":"http://127.0.0.1:9201/",
    "ESUserName":"",
    "ESPassword":"",
    "QQAPPID":"",
    "QQAPPKey":"",
    "QQAuthReturnURL":""
}

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        public class AppSettings
        {
            public string MySQLConnectionString {get;set;}

            public string RedisConnectionString {get;set;}

            // ....
        }

        public AppSettings JsonHelper(string jsonFilePath)
        {
            _movieJsonFilePath = jsonFilePath;
            if (!File.Exists(jsonFilePath))
            {
                var pvFile = File.Create(jsonFilePath);
                pvFile.Flush();
                pvFile.Dispose();
                return;

            }
            using (var stream = new FileStream(jsonFilePath, FileMode.OpenOrCreate))
            {
                try
                {
                    StreamReader sr = new StreamReader(stream);
                    JsonSerializer serializer = new JsonSerializer
                    {
                        NullValueHandling = NullValueHandling.Ignore,
                        Converters = { new JavaScriptDateTimeConverter() }
                    };
                    //构建Json.net的读取流  
                    using (var reader = new JsonTextReader(sr))
                    {
                        return serializer.Deserialize<AppSettings>(reader);
                    }

                }
                catch (Exception ex)
                {
                    return null;
                }
            }
        }

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        public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
        {
            var mySQLConnectionString = new ConfigurationBuilder()
                    .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json").Build()["MySQLConnectionString"];

            // ConnectionStrings节点下的MySQLConnectionString
            // var mySQLConnectionString = new ConfigurationBuilder()
            //         .SetBasePath(Directory.GetCurrentDirectory())
            //     .AddJsonFile("appsettings.json").Build()["ConnectionStrings:MySQLConnectionString"];
        }

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        //Startup.cs
        public IConfiguration Configuration { get; }

        public Startup(IHostingEnvironment env)
        {
            //够赞
            var builder = new ConfigurationBuilder()
                .SetBasePath(env.ContentRootPath)
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
            Configuration = builder.Build();
        }

         public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc();
            //将Configuration注入到APPConfiguration实例中
            services.AddOptions().Configure<AppSettings>(Configuration);
        }

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        private AppSettings configuration;

        public AccountController(IOptions<AppSettings> configurationOption)
        {
            this.configuration = configurationOption.Value;
        }