5.自定义配置数据源与配置中心方案

一、扩展步骤

1.实现 IConfigurationProvider

    class MyConfigurationProvider : ConfigurationProvider
    {

        Timer timer;

        public MyConfigurationProvider() : base()
        {
            timer = new Timer();
            timer.Elapsed += Timer_Elapsed;
            timer.Interval = 3000;
            timer.Start();
        }

        private void Timer_Elapsed(object sender, ElapsedEventArgs e)
        {
            Load(true);
        }

        public override void Load()
        {
            //加载数据
            Load(false);
        }

        void Load(bool reload)
        {
            this.Data["lastTime"] = DateTime.Now.ToString();
            if (reload)
            {
                base.OnReload();
            }
        }
    }

 

2.实现 IConfigurationSource

    class MyConfigurationSource : IConfigurationSource
    {
        public IConfigurationProvider Build(IConfigurationBuilder builder)
        {
            return new MyConfigurationProvider();
        }
    }

 

3.实现 AddXXX 扩展方法

    public static class MyConfigurationBuilderExtensions
    {
        public static IConfigurationBuilder AddMyConfiguration(this IConfigurationBuilder builder)
        {
            builder.Add(new MyConfigurationSource());
            return builder;
        }
    }

4.使用

        static void Main(string[] args)
        {
            var builder = new ConfigurationBuilder();
            builder.AddMyConfiguration();
            var configRoot = builder.Build();

            ChangeToken.OnChange(() => configRoot.GetReloadToken(), () =>
            {
                Console.WriteLine($"lastTime:{configRoot["lastTime"]}");
            });
            Console.ReadKey();
        }