Accessing a request header from inside a custom PostSharp attribute

Question

I'm trying to access a HttpRequestMessage from inside a custom PostSharp attribute.

In my Web API I could do it like this:

string headerText = Request.Headers.GetValues("TestHeader").First();

This doesn't seem to work outside of the API controller.

[Serializable]
[AttributeUsage(AttributeTargets.Method)]
public sealed class LogHeaderAttribute : OnMethodBoundaryAspect
{
    public override void OnEntry(MethodExecutionArgs args)
    {
        // Log Web API request header info here
    }
}

Answer 1

I found I can access the headers this way:

[Serializable]
[AttributeUsage(AttributeTargets.Method)]
public sealed class LogHeaderAttribute : OnMethodBoundaryAspect
{
    public override void OnEntry(MethodExecutionArgs args)
    {
        ApiController apiController = (ApiController)args.Instance;
        var context = apiController.ControllerContext;
        HttpRequestHeaders headers = context.Request.Headers;

        // Use Web API request header info here
        string headerText = headers.GetValues("MyHeader").First();
    }
}