如何参数传递到使用RegisterType和控制器工厂

Question

autofac我有这个类：

public class MessageService 
{ 
    private readonly IMessageSender messageSender; 

    public MessageService(IMessageSender messageSender) 
    { 
     this.messageSender = messageSender; 
    } 
} 

如何注册autofac通过内部构造函数的参数：

var builder = new ContainerBuilder(); 
builder.RegisterControllers(typeof(MvcApplication).Assembly); 
var container = builder.Build(); 
DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); 
builder.RegisterType<MandrillMessageSender>().As<IMessageSender>(); 

builder.RegisterType<MessageService>(new MandrillMessageSender()); // NOTE THIS STRING IS NOT WORKING 

所以结果应该这样工作，当我在控制器构造函数中传递参数时，应该使用插入的MandrillMessageSerder创建messageService对象。

public Home(MessageService messageService) 

Answer 1

您需要调用builder.Build()

var builder = new ContainerBuilder(); 
builder.RegisterControllers(typeof(MvcApplication).Assembly); 
builder.RegisterType<MandrillMessageSender>().As<IMessageSender>(); 
builder.RegisterType<MessageService>(); 

var container = builder.Build(); 
DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); 

注意，你不需要通过任何在MessageService注册，如果你只有一个实现IMessageSender接口之前做的所有RegisterType电话（Autofac会知道你需要那里的）