Autofac is not filling action filter property

Question

I have an action filter in an ASP.NET MVC 3 app that needs some dependencies injected into it. I am using Autofac.Mvc3 as the dependency injector. According to the autofac wiki I just have to register the types that I want to inject, call `RegisterFilterProvider`, and put a public property on my action filter, and then autofac will fill the property with the right object during filter instantiation. Here is a part of my action filter: ``` Public Class LogActionAttribute Inherits ActionFilterAttribute Property tracer As TraceSource Public Overrides Sub OnActionExecuting(filterContext As System.Web.Mvc.ActionExecutingContext) ... tracer.TraceData(...) ... End Sub End Class ``` Here is a part of my global.asax: ``` Public Class MvcApplication Inherits System.Web.HttpApplication Shared Sub RegisterGlobalFilters(ByVal filters As GlobalFilterCollection) filters.Add(New MyHandleErrorAttribute) filters.Add(New LogActionAttribute) End Sub Sub Application_Start() InitSettingRepoEtc() ... End Su…

Accepted Answer

IIRC the provider doesn't work with 'global' filters.

Remove this function:

```
Shared Sub RegisterGlobalFilters(ByVal filters As GlobalFilterCollection)
    filters.Add(New MyHandleErrorAttribute)
    filters.Add(New LogActionAttribute)
End Sub
```

And instead, register the global filters with Autofac directly:

```
 builder.Register(Of MyHandleErrorAttribute)
     .As(Of IActionFilter)
     .PropertiesAutowired()
     .SingleInstance();

builder.Register(Of LogActionAttribute)
     .As(Of IActionFilter)
     .PropertiesAutowired()
     .SingleInstance();
```

Autofac will create the filters and include them appropriately. The advantage of this approach is that you can refactor so the filters are not attribute-derived, and then use constructor rather than property injection.

Autofac is not filling action filter property

Solution

Problem