AutoFac Injection into attribute

Question

So I have a need for injecting a number of different services into an authorization attribute I'm using. For simplicity I will leave this to show the configuration manager.

public class FeatureAuthorizeAttribute : AuthorizeAttribute
{
    public IConfigurationManager ConfigurationManager;

    private readonly string _feature;
    public FeatureAuthorizeAttribute(string feature)
    {
        _feature = feature;

        var test  = ConfigurationManager.GetCdnPath();
    }
}

Which would be used as follows

[FeatureAuthorize("Admin")]

I have tried to use constructor injection

public FeatureAuthorizeAttribute(string feature, IConfigurationManager configurationManager)
{
   ConfigurationManager = configurationManager;
   _feature = feature
}

However this just causes an error when I attempt

[FeatureAuthorize("Admin", IConfigurationManager)]

Which seems like the wrong way to go about it in the first place. I'm assuming that I need to register my custom authorization attribute with the container to get it to start picking up

Answer 1

Instead of trying to use Dependency Injection with attributes (which you can't do in any sane, useful way), create Passive Attributes.

Specifically, in this case, assuming that this is an ASP.NET MVC scenario, you can't derive from AuthorizeAttribute. Instead, you should make your Authorization service look for your custom attribute, and implement IAuthorizationFilter. Then add the filter to your application's configuration.

More details can be found in this answer: https://stackoverflow.com/a/7194467/126014.