Json配置

:::info Nuget下载包:

Microsoft.Extensions.Configuration

Microsoft.Extensions.Configuration.Json

:::

示例代码：

{
  "name": "校长",
  "age": 18,
  "proxy": {
    "server": "http://www.baidu.com",
    "port": "8080"
  }
}

internal class Program
    {
        static void Main(string[] args)
        {            
            ConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
            configurationBuilder.AddJsonFile("config.json", optional: true, reloadOnChange: true);
            IConfigurationRoot config = configurationBuilder.Build();
            string name = config["name"];
            Console.WriteLine($"name={name}");
            var server = config.GetSection("proxy:server").Value;
            Console.WriteLine($"server={server}");
            Proxy proxy = config.GetSection("proxy").Get<Proxy>();
            Console.WriteLine($"server={proxy.Server},prot={proxy.port}");
            Console.WriteLine();
            Console.Read();
        }
    }
    class Proxy
    {
        public string Server { get; set; }
        public int port { get; set; }
    }

IOC选项方式读取配置

:::info

1. IOptions //直接单例,读出来就缓存，不支持数据变化，性能高—只能读默认名字
2. IOptionsMonitor // 只读一次，写入缓存——-但是支持数据修改，靠的是监听文件更新(onchange)数据，实时变更
3. IOptionsSnapshot //作用域注册，一次请求内数据是缓存不变的，但是不同请求是每次都会重新第一次数据

:::

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Configuration.Json;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
static void Main(string[] args)
   {
       ServiceCollection services = new ServiceCollection();
       services.AddScoped<Controller>();
       ConfigurationBuilder configurationBuilder = new ConfigurationBuilder();
       configurationBuilder.AddJsonFile("config.json", optional: true, reloadOnChange: true);
       IConfigurationRoot configurationRoot = configurationBuilder.Build();
       services.AddOptions().Configure<Config>(e => configurationRoot.Bind(e));
       using (var s = services.BuildServiceProvider())
            {
                while (true)
                {
                    using(var sp = s.CreateScope()){
                    Controller controller = sp.ServiceProvider.GetRequiredService<Controller>();
                    controller.Test();
                    Console.WriteLine("修改JSON文件。。。");
                    Console.WriteLine("请输入，，");
                    Console.Read();
                    }
                }
            }
       Console.Read();
   }
 public class Config
    {
        public string Name { get; set; }
        public int Age { get; set; }
        public Proxy proxy { get; set; }
    }
    public class Proxy
    {
        public string Server { get; set; }
        public int port { get; set; }
    }
    public class Controller
    {
         private readonly IOptions<Config> optConfig1;///直接单例，读出来就缓存，不支持数据变化，性能高--只能度默认名字
        private readonly IOptionsSnapshot<Config> optConfig;//作用域注册，一次请求内数据是缓存不变的，但是不同请求是每次都会重新第一次数据
        private readonly IOptionsMonitor<Config> optConfig2;//只读一次，写入缓存-----但是支持数据修改，靠的是监听文件更新(onchange)数据，实时变更
        public Controller(IOptionsSnapshot<Config> config, IOptions<Config> optConfig1, IOptionsMonitor<Config> optConfig2)
        {
            this.optConfig = config;
            this.optConfig1 = optConfig1;
            this.optConfig2 = optConfig2;
        }
        public void Test()
        {
          Console.WriteLine($"IOptions:{optConfig1.Value.Name},{optConfig1.Value.Age}");
            Config config = optConfig.Value;
            Console.WriteLine($"IOptionsSnapshot:{config.Name},{config.Age}");
            Console.WriteLine($"IOptionsMonitor:{optConfig2.CurrentValue.Name},{optConfig2.CurrentValue.Age}");
        }
    }