由于项目业务复杂，创建了多个Areas 并把他们放在了不同的项目中，项目使用AutoFac做的IOC
配置代码为
1 public class MvcApplication : System.Web.HttpApplication 2 { 3 protected void Application_Start() 4 { 5 //依赖注入 6 var builder = new ContainerBuilder(); 7 builder.RegisterModule(new ConfigurationSettingsReader("autofac")); 8 builder.RegisterControllers(Assembly.GetExecutingAssembly()); 9 10 var container = builder.Build(); 11 DependencyResolver.SetResolver(new AutofacDependencyResolver(container)); 12 13 AreaRegistration.RegisterAllAreas(); 14 WebApiConfig.Register(GlobalConfiguration.Configuration); 15 FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters); 16 RouteConfig.RegisterRoutes(RouteTable.Routes); 17 } 18 }
在 Controllers中 采用 构造函数来实现注入
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namespace
xxx.Web.Person.Controllers
{ /// <summary>
/// 定位模块
/// </summary>
public
class LocationController : Controller
{
private
ILocationService _location;
public
LocationController(ILocationService location)
{
_location = location;
}
}
} |
启动后报错 错误信息：
[MissingMethodException: 没有为该对象定义无参数的构造函数。] System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0 System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache) +98 System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache) +241 System.Activator.CreateInstance(Type type, Boolean nonPublic) +69 System.Web.Mvc.DefaultControllerActivator.Create(RequestContext requestContext, Type controllerType) +67
[InvalidOperationException: 尝试创建“xxx.Web.Person.Controllers.HomeController”类型的控制器时出错。请确保控制器具有无参数公共构造函数。]
通过错误信息得知 AutoFac 的RegisterControllers 只是 注入了xxx.Web的 Controllers 对于引用的 xxx.web.Person.dll 下的 Controller 没有注入。
解决方法如下：
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public
class MvcApplication : System.Web.HttpApplication
{
protected
void Application_Start()
{
//依赖注入
var
builder = new
ContainerBuilder();
builder.RegisterModule(new
ConfigurationSettingsReader("autofac"));
builder.RegisterControllers(Assembly.GetExecutingAssembly());
//解决Areas在不同的Dll中注入问题
var
assemblies = new
DirectoryInfo(
HttpContext.Current.Server.MapPath("~/bin/"))
.GetFiles("*.dll")
.Select(r => Assembly.LoadFrom(r.FullName)).ToArray();
builder.RegisterAssemblyTypes(assemblies)
.Where(r => r.BaseType == typeof(Controller))
.InstancePerHttpRequest();
var
container = builder.Build();
DependencyResolver.SetResolver(new
AutofacDependencyResolver(container));
AreaRegistration.RegisterAllAreas();
WebApiConfig.Register(GlobalConfiguration.Configuration);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
}
}
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重新编译 运行正常。