.NET Core 控制臺程序沒有 ASP.NET Core 的 IWebHostBuilder 與?Startup.cs ，那要讀 appsettings.json、注依賴、配日志、設 IOptions 該怎么辦呢？因為這些操作與 ASP.NET Core 無依賴，所以可以自己動手，輕松搞定。

1、讀?appsettings.json ，ConfigurationBuilder 上

var conf = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json", true, true).AddJsonFile("appsettings.Development.json", true, true).Build();

需要安裝 nuget 包 Microsoft.Extensions.Configuration?、Microsoft.Extensions.Configuration.FileExtensions 、Microsoft.Extensions.Configuration.Json

2、注依賴，IServiceCollection + IServiceProvider 一起來

IServiceCollection services = new ServiceCollection();//...services.AddSingleton<CosClient>(); IServiceProvider serviceProvider = services.BuildServiceProvider();var cosClient = serviceProvider.GetService<CosClient>();

需要安裝 nuget 包 Microsoft.Extensions.DependencyInjection?

3、配日志，?AddLogging 與 ILoggingBuilder 肩并肩

services.AddLogging(builder => builder ? ?.AddConfiguration(conf.GetSection("Logging")).AddConsole());

需要安裝 nuget 包 Microsoft.Extensions.Logging 、Microsoft.Extensions.Logging.Configuration 、Microsoft.Extensions.Logging.Console

4、設IOptions，AddOptions() 與?Configure<T> 齊步走

services.AddOptions(); services.Configure<CosClientOptions>(conf.GetSection("cosClient"));

需要安裝 nuget 包?Microsoft.Extensions.Options 與?Microsoft.Extensions.Options.ConfigurationExtensions

完整代碼：

class Program { ? ?
? ? ?static async Task Main(string[] args){ ? ? ? ?var conf = new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory()).AddJsonFile("appsettings.json", true, true).AddJsonFile("appsettings.Development.json", true, true).Build();IServiceCollection services = new ServiceCollection();services.AddLogging(builder => builder.AddConfiguration(conf.GetSection("Logging")).AddConsole());services.AddOptions();services.Configure<CosClientOptions>(conf.GetSection("cosClient"));services.AddSingleton<CosClient>();IServiceProvider serviceProvider = services.BuildServiceProvider(); ? ?
? ? ?var cosClient = serviceProvider.GetService<CosClient>();} }

原文：http://www.cnblogs.com/dudu/p/7803086.html

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