.NET Core 控制台程序讀 appsettings.json 、注依賴、配日志、設 IOptions

.NET Core 控制台程序沒有 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 ();
IServiceProvider serviceProvider = services.BuildServiceProvider();var cosClient = serviceProvider.GetService ();
需要安裝 nuget 包 Microsoft.Extensions.DependencyInjection

3、配日志， AddLogging 與 ILoggingBuilder 肩並肩

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 齊步走

services.AddOptions();
services.Configure (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 (conf.GetSection("cosClient"));
       services.AddSingleton ();

IServiceProvider serviceProvider = services.BuildServiceProvider();    
     var cosClient = serviceProvider.GetService ();
   }
}

作者：dotNET跨平台
來源：CSDN
原文：https://blog.csdn.net/sD7O95O/article/details/78694739
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