.NET Core 控制台程序读 appsettings.json 、注依赖、配日志、设 IOptions

.NET Core 控制台程序没有 ASP.NET Core 的 IWebHostBuilder 与 Startup.cs ，那要读 appsettings.json、注依赖、配日志、设 IOptions 该怎么办呢？因为这些操作与 ASP.NET Core 无依赖，所以可以自己动手，轻松搞定。

1、读 appsettings.json ，ConfigurationBuilder 上

var conf = new ConfigurationBuilder()
   .SetBasePath(Directory.GetCurrentDirectory())
   .AddJsonFile("appsettings.json", true, true)
   .AddJsonFile("appsettings.Development.json", true, true)
   .Build();
需要安装 nuget 包 Microsoft.Extensions.Configuration 、Microsoft.Extensions.Configuration.FileExtensions 、Microsoft.Extensions.Configuration.Json

2、注依赖，IServiceCollection + IServiceProvider 一起来

IServiceCollection services = new ServiceCollection();//...services.AddSingleton();
IServiceProvider serviceProvider = services.BuildServiceProvider();var cosClient = serviceProvider.GetService();
需要安装 nuget 包 Microsoft.Extensions.DependencyInjection

3、配日志， AddLogging 与 ILoggingBuilder 肩并肩

services.AddLogging(builder => builder    
   .AddConfiguration(conf.GetSection("Logging"))
   .AddConsole());
需要安装 nuget 包 Microsoft.Extensions.Logging 、Microsoft.Extensions.Logging.Configuration 、Microsoft.Extensions.Logging.Console

4、设IOptions，AddOptions() 与 Configure 齐步走

services.AddOptions();
services.Configure(conf.GetSection("cosClient"));
需要安装 nuget 包 Microsoft.Extensions.Options 与 Microsoft.Extensions.Options.ConfigurationExtensions

完整代码：

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
来源：CSDN
原文：https://blog.csdn.net/sD7O95O/article/details/78694739
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