我正在尝试使用Autofac自动连线属性为控制器调用的自定义类设置一个类。我有一个测试项目来显示这一点。我的解决方案中有两个项目。一个MVC Web应用程序和一个用于服务的类库。这是代码:
在服务项目中,AccountService.cs:
public interface IAccountService
{
string DoAThing();
}
public class AccountService : IAccountService
{
public string DoAThing()
{
return "hello";
}
}
现在其余都在MVC Web项目中。
Global.asax.cs
var builder = new ContainerBuilder();
builder.RegisterControllers(Assembly.GetExecutingAssembly()).PropertiesAutowired();
builder.RegisterAssemblyTypes(typeof(AccountService).Assembly)
.Where(t => t.Name.EndsWith("Service"))
.AsImplementedInterfaces().InstancePerRequest();
builder.RegisterType<Test>().PropertiesAutowired();
builder.RegisterFilterProvider();
var container = builder.Build();
DependencyResolver.SetResolver(new AutofacDependencyResolver(container));
Test.cs:
public class Test
{
//this is null when the var x = "" breakpoint is hit.
public IAccountService _accountService { get; set; }
public Test()
{
}
public void DoSomething()
{
var x = "";
}
}
HomeController.cs
public class HomeController : Controller
{
//this works fine
public IAccountService _accountServiceTest { get; set; }
//this also works fine
public IAccountService _accountService { get; set; }
public HomeController(IAccountService accountService)
{
_accountService = accountService;
}
public ActionResult Index()
{
var t = new Test();
t.DoSomething();
return View();
}
//...
}
从上面的代码中可以看到,_accountServiceTest
和_accountService
在控制器中都可以正常工作,但是在DoSomething()
的Test.cs
方法中设置断点时,_accountService
始终为null,否不管我在global.asax.cs
中输入什么。
使用new
创建对象时,autofac对该对象一无所知。因此,通常在IAccountService
类中对于Test
总是为null。
这样的正确方法:设置Test类的接口并注册。然后将此接口添加到您的HomeController构造函数。
public HomeController(IAccountService accountService,ITest testService)