Net Core的启动项Program(2)

namespace ConsoConfiguration
{
    public class Program
    {

        //Configuration： Represents a set of key/value application configuration properties.
        //表示一组键/值 应用程序配置属性。
        private static IConfiguration Configuration { set; get; }

        static void Main(string[] args)
        {

            //ConfigurationBuilder：Used to build key/value based configuration settings for use in an application
            //用于生成基于键/值的配置设置，以便在应用程序中使用
            //这个主要用于配置管理
            var Configure = new ConfigurationBuilder();
            Configure.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);
            //Build==》Configure
            var configuration = Configure.Build();//启动
            var GetSectionValue = configuration.GetSection("ConnectionStrings").GetValue<string>("wms");
            var GetConnectionStringValue = configuration.GetConnectionString("wms");
            //↑↑↑上面是把基于Key/Value的配置给配置好了↑↑↑↑↑↑↑↑↑↑↑

            //↓↓↓给Host添加所需要的服务↓↓↓↓↓↓
            var builder = new HostBuilder();
            //配置Loggering的服务
            builder.ConfigureLogging((hostbuildercontext, loggering) =>
            {
                loggering.AddConsole();
            });

            //配置Services的服务
            //ConfigureServices：Adds services to the container. This can be called multiple times and the results  will be additive.
            //向容器添加服务。这可以多次调用，结果将是相加的。
            builder.ConfigureServices((hostbuildercontext, ServicesCollections) =>
            {
                //hostbuildercontext.Configuration：
                //这个Microsoft.Extensions.Configuration.IConfiguration包含应用程序和Microsoft.Extensions.Hosting.i主机。
                Configuration = hostbuildercontext.Configuration;
                //链接SqlConnectionString
                ServicesCollections.AddDbContext<WMSContext>(o => o.UseSqlServer(configuration.GetSection("").GetValue<string>("")));
                //常见的服务NuGet
                ServicesCollections.AddHttpClient();
                ServicesCollections.AddOptions();
                //生命周期
                ServicesCollections.AddSingleton(Configuration);

            });
            //Build==》用来启动Host
            var host = builder.Build();
            using (host)
            {
                host.Run();
            }

            Console.WriteLine("Hello World!");
        }
    }
}

{
  "ConnectionStrings": {
    "wms": "Data Source=;Initial Catalog=WMS;Persist Security Info=True;User ID=wms;Password=",  
    "acc_hub": "Data Source=;pwd=;uid=sa;database=;"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AppSettings": {
    "Name": "tom",
    "Age": "15"
  },
  "AllowedHosts": "*"
}