.NET Core控制台项目中使用DI依赖注入

本文主要介绍在.net Core 控制台程序中如何进行依赖注入，简单步骤如下

1、.NET Core Console项目安装引用Nuget包

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Install-Package Microsoft.Extensions.Configuration.EnvironmentVariables Install-Package Microsoft.Extensions.Configuration.Json Install-Package Microsoft.Extensions.DependencyInjection Install-Package Microsoft.Extensions.Logging.Console Install-Package Microsoft.Extensions.Logging.Debug Install-Package Microsoft.Extensions.Options

2、使用Nuget的界面的管理器安装：

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Microsoft.Extensions.Configuration.EnvironmentVariables Microsoft.Extensions.Configuration.Json Microsoft.Extensions.DependencyInjection Microsoft.Extensions.Logging.Console Microsoft.Extensions.Logging.Debug Microsoft.Extensions.Options

3、修改Program.cs文件

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static void Main(string[] args)         {             var env = Environment.GetEnvironmentVariable("APP_ENVIRONMENT");               //根据环境变量读取配置文件             string appsetting = !string.IsNullOrEmpty(env) ? $"appsettings.{env}.json" : "appsettings.json";               var services = new ServiceCollection();               // 创建 config             var configuration = new ConfigurationBuilder()                 .SetBasePath(Directory.GetCurrentDirectory())                 .AddJsonFile(appsetting, optional: false)                 .AddEnvironmentVariables()                 .Build();             services.Configure<ConnectionStrings>(configuration.GetSection("ConnectionStrings"));             //注入<br>            services.AddLogging();             services.AddTransient<ILoggerFactory, LoggerFactory>();             //注入数据库             var defaultConnection = connectionStrings.DBConnection;             services.AddLinqToDbContext<DBContext>((provider, options) =>             {                 options.UseSqlServer(defaultConnection).UseDefaultLogging(provider);             });                                   //调用             var serviceProvider = services.BuildServiceProvider();               var bar = serviceProvider.GetService<*********>();             bar.*******();               Console.WriteLine("Hello World!");         }