ASP.NET Core修改IOC为Autofac

如下是我为了了解如何更换ASP.NET Core中的IOC而查找的文章，如果大家英文OK的，可以直接前往阅读，同时也已经有简单的github例子供大家参考。

参考文章：

ASP.NET Core文档：https://docs.asp.net/en/latest/fundamentals/dependency-injection.html#replacing-the-default-services-container

Autofac文档：http://docs.autofac.org/en/latest/integration/aspnetcore.html

Autofac官网的Example:https://github.com/autofac/Examples/tree/master/src/AspNetCoreExample

有了上面的参考文章，其他多余的废话也不说了，直接说重点。

1. 在Nuget上，找到Autofac和Autofac.Extensions.DependencyInjection，直接安装。

2. 修改Startup.cs中的代码，主要ConfigureServices(IServiceCollection services)方法。其中该方法默认的返回值为void，这里需要修改返回值为IServiceProvider。代码如下：

public IContainer ApplicationContainer { get; private set; }

// ConfigureServices is where you register dependencies. This gets
  // called by the runtime before the Configure method, below.
  public IServiceProvider ConfigureServices(IServiceCollection services)
  {
    // Add services to the collection.
    services.AddMvc();

    // Create the container builder.
    var builder = new ContainerBuilder();

    // Register dependencies, populate the services from
    // the collection, and build the container. If you want
    // to dispose of the container at the end of the app,
    // be sure to keep a reference to it as a property or field.
    builder.RegisterType<MyType>().As<IMyType>();
    builder.Populate(services);
    this.ApplicationContainer = builder.Build();

    // Create the IServiceProvider based on the container.
    return new AutofacServiceProvider(this.ApplicationContainer);
  }

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