ASP.NET Core 클래스 라이브러리 프로젝트에서 구성 파일을 읽는 방법에 대한 자세한 설명

var builder = new ConfigurationBuilder()
    .SetBasePath(env.ContentRootPath)
    .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
    .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
    .AddEnvironmentVariables();
    Configuration = builder.Build();

public void ConfigureServices(IServiceCollection services)
  {

   services.Configure<BlogViewModel>(Configuration.GetSection("JeffckySettings"));
   ......
   }

var basePath = AppDomain.CurrentDomain.BaseDirectory;
var appName = AppDomain.CurrentDomain.ApplicationIdentity.FullName;

Directory.GetCurrentDirectory()

AppContext.BaseDirectory

Assembly.GetEntryAssembly().GetName().Name;

var name = typeof(T).GetTypeInfo().Assembly.GetName().Name;

Assembly.GetEntryAssembly().GetName().Version.ToString()

//
  // 摘要:
  //  Adds a new configuration source.
  //
  // 参数:
  // source:
  //  The configuration source to add.
  //
  // 返回结果:
  //  The same Microsoft.Extensions.Configuration.IConfigurationBuilder.
  public IConfigurationBuilder Add(IConfigurationSource source);

//
 // 摘要:
 //  Represents a JSON file as an Microsoft.Extensions.Configuration.IConfigurationSource.
 public class JsonConfigurationSource : FileConfigurationSource
 {
  public JsonConfigurationSource();

  //
  // 摘要:
  //  Builds the Microsoft.Extensions.Configuration.Json.JsonConfigurationProvider
  //  for this source.
  //
  // 参数:
  // builder:
  //  The Microsoft.Extensions.Configuration.IConfigurationBuilder.
  //
  // 返回结果:
  //  A Microsoft.Extensions.Configuration.Json.JsonConfigurationProvider
  public override IConfigurationProvider Build(IConfigurationBuilder builder);
 }

IConfiguration config = new ConfigurationBuilder()
    .SetBasePath(currentClassDir)
    .AddJsonFile("appsettings.json", false, true)
    .Add(new JsonConfigurationSource { Path = "appsettings.json", Optional = false, ReloadOnChange = true })
    .Build();

var person = ConfigurationManager.GetAppSettings<Person>("JeffckySettings");