DotNETCore 学习笔记依赖注入和多环境

最新推荐文章于 2025-06-07 10:01:15 发布

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最新推荐文章于 2025-06-07 10:01:15 发布

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原文链接：http://www.cnblogs.com/ziranquliu/p/5872109.html

本文介绍了ASP.NET中依赖注入的基本概念与不同生命周期的服务配置方法，并提供了使用Autofac进行依赖注入的具体实现示例。此外，还讲解了如何根据不同环境进行配置。

Dependency Injection
------------------------------------------------------------------------
ASP.NET services can be configured with the following lifetimes:

Transient
Transient lifetime services are created each time they are requested. This lifetime works best for 

lightweight, stateless services.

Scoped
Scoped lifetime services are created once per request.

Singleton
Singleton lifetime services are created the first time they are requested (or when ConfigureServices is run 

if you specify an instance there) and then every subsequent request will use the same instance. If your 

application requires singleton behavior, allowing the services container to manage the service’s lifetime 

is recommended instead of implementing the singleton design pattern and managing your object’s lifetime in 

the class yourself.

**********************************************************************************
"dependencies" : {
  "Autofac": "4.0.0",
  "Autofac.Extensions.DependencyInjection": "4.0.0"
},

public IServiceProvider ConfigureServices(IServiceCollection services)
{
  services.AddMvc();
  // add other framework services

  // Add Autofac
  var containerBuilder = new ContainerBuilder();
  containerBuilder.RegisterModule<DefaultModule>();
  containerBuilder.Populate(services);
  var container = containerBuilder.Build();
  return new AutofacServiceProvider(container);
}


public class DefaultModule : Module
{
  protected override void Load(ContainerBuilder builder)
  {
    builder.RegisterType<CharacterRepository>().As<ICharacterRepository>();
  }
}

**********************************************************************************

Working with Multiple Environments

ASPNETCORE_ENVIRONMENT：Development, Staging, and Production

env.IsEnvironment("environmentname")
or
env.EnvironmentName == "Development" 

Startup{EnvironmentName} (for example StartupDevelopment)

Configure{EnvironmentName}() ConfigureDevelopment() 

Configure{EnvironmentName}Services(). ConfigureDevelopmentServices（）