如何在混合Web API和MVC应用程序中使用Autofac解析Web API控制器？

Question

嗨,我有一个MVC应用程序,我已经为我的Web API定义了一些依赖项.

public class AutofacWebApiDependenceResolver : IDependencyResolver
{
    private readonly IComponentContext container;
    public AutofacWebApiDependenceResolver(IContainer container)
    {

     if (container == null)
     {
         throw new ArgumentNullException("container");
     }
     this.container = container;
    }

    public object GetService(Type serviceType)
    {
        if (serviceType == null)
        {
            throw new ArgumentNullException("serviceType");
        }
        var ret = this.container.ResolveOptional(serviceType) ;
        return ret;
    }
    public IEnumerable<object> GetServices(Type serviceType)
    {            
        if (serviceType == null)
        {
            throw new ArgumentNullException("serviceType");
        }            
        Type enumerableType = typeof(IEnumerable<>).MakeGenericType(serviceType);
        var ret = (IEnumerable<object>)this.container.ResolveOptional(enumerableType);
        return ret;
    }
}

然后在我的bootstrapper类中,我在Application_Start中调用它,如下所示:

GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependenceResolver((IContainer)container);

当我调试代码时,我可以看到我的DependencyResolver注册了所有服务,但是我仍然收到以下错误:

发生错误.Type'WebApp.Controllers.AuthenticateController'没有默认构造函数

这是我的控制器的代码:

public class AuthenticateController : ApiController
{
    private readonly IFormsAuthenticationService formsAuthenticationService;
    private readonly IMemberShipProvider memberShip;
    private readonly IDataService dataService;

    public AuthenticateController(
        IMemberShipProvider memberShip,
        IFormsAuthenticationService formsAuthenticationService, IDataService dataService)
    {
        this.memberShip = memberShip;
        this.formsAuthenticationService = formsAuthenticationService;
        this.dataService= dataService;
     }

}

如何将参数带到api控制器.Simple控制器工作正常.

Answer 1

我建议以下内容使用MVC和WebApi在您的应用程序中使用它.

首先,您的项目需要引用以下内容

• Autofac
• Autofac.WebApi
• Autofac.Mvc5(更改末尾的数字以匹配您的aspnet mvc版本)

然后在您的Autofac注册中,您将需要以下注册MVC和WebApi控制器以及您需要的任何其他注册.然后将Container连接到MVC DI和WebApi DI.

var builder= new ContainerBuilder();
builder.RegisterControllers(Assembly.GetExecutingAssembly()); //Register MVC Controllers
builder.RegisterApiControllers(Assembly.GetExecutingAssembly()); //Register WebApi Controllers
//Register any other components required by your code....

var container = builder.Build();

DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); //Set the MVC DependencyResolver
GlobalConfiguration.Configuration.DependencyResolver = new AutofacWebApiDependencyResolver((IContainer)container); //Set the WebApi DependencyResolver

我希望这有帮助.

Answer 2

nemesv的指导做了伎俩

builder.RegisterApiControllers(Assembly.GetExecutingAssembly())

打电话builder.RegisterApiControllers前打电话builder.Build()