.Net Core 中配置的高级用法

一、创建AppSetting帮助类

public class AppSetting
    {
        private static readonly object objLock = new object();      //锁
        private static AppSetting instance = null;

        private IConfigurationRoot Config { get; }
        private AppSetting(string environmentName)
        {
            var builder = new ConfigurationBuilder()
                .SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)//增加环境配置文件，新建项目默认有
                .AddJsonFile($"appsettings.{environmentName}.json", optional: true, reloadOnChange: true);
            Config = builder.Build();

        }
        //加锁
        public static AppSetting GetInstance(string environmentName)
        {
            if (instance == null)
            {
                lock (objLock)
                {
                    if (instance == null)
                    {
                        instance = new AppSetting(environmentName);
                    }
                }
            }
            return instance;
        }
        //读取方法
        public string GetConfig(string name)
        {
            var val = this.Config.GetSection(name).Value;
            return val;
        }
        public string[] GetArray(string name)
        {
            var val = this.Config.GetSection(name).Get<string[]>();
            return val;
        }
    }

注：使用.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)这种方法可以保证可以修改正在运行的dotnet core 程序，不需要重启程序

未完待续。。。