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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