Question

I am pretty new to Unity & IoC in general & as usual, I have quickly got myself into a bind…

I have created an Authorization Filter Attribute for the ASP.NET Web API Beta. I now need to inject my Authorizer into the Attribute however since this is an attribute I cannot simply do this public TestAuthAttribute(IAuthorizer Authorizer) in my constructor.

So I then decided to create a public property decorated with the [Dependency] attribute for property injection however it does not get resolved.

Here is the code:

public class TestAuthAttribute : AuthorizationFilterAttribute
{
    [Dependency]
    public IAuthorizer Authorizer { get; set; }

    public TestAuthAttribute() {
        ...
        }

    private bool authorizeCore(HttpRequestMessage request)
    {
        if (Authorizer == null)
            throw Error.ArgumentNull("Null Authorizer");  // <<<<< this is null
    }

When the controller is decorated with the [TestAuth] the Attribute is triggered but the Authorizer is not resolved, it is null)

I have placed the following code in my controller & Authorizer does get resolved…

[Dependency]
    public IAuthorizer Authorizer { get; set; }

Why is this dependency not resolved in my AuthorizationFilterAttribute & how would you go about Injecting the Authorizer into the AuthorizationFilterAttribute?

Answer 1

Full disclosure: I have not used Turbine.

Having said that, I think it might solve your problem for you or at least show you how to solve it.

They have a Unity Nuget package here: http://nuget.org/packages/MvcTurbine.Unity

And you can find more detail on their codeplex site here: http://mvcturbine.codeplex.com/

Hope that helps.