How to implement this (HttpContext) dependency in Unity?

Question

we have a class with a dependency to the HttpContext. We've implemented it like this:

public SiteVariation() : this(new HttpContextWrapper(HttpContext.Current))
{
}
public SiteVariation(HttpContextBase context)
{}

Now what i want to do is to instantiate the SiteVariation class via Unity, so we can create one constructor. But i do not know how to configure this new HttpContextWrapper(HttpContext.Current)) in Unity in the config way.

ps this is the config way we use

<type type="Web.SaveRequest.ISaveRequestHelper, Common" mapTo="Web.SaveRequest.SaveRequestHelper, Common" />

Answer 1

I wouldn't take a dependency on HttpContextBase directly. I would instead create a wrapper around it, and use the bits you need:

public interface IHttpContextBaseWrapper
{
   HttpRequestBase Request {get;}
   HttpResponseBase Response {get;}
   //and anything else you need
}

then the implementation:

public class HttpContextBaseWrapper : IHttpContextBaseWrapper
{
   public HttpRequestBase Request {get{return HttpContext.Current.Request;}}
   public HttpResponseBase Response {get{return HttpContext.Current.Response;}}
   //and anything else you need
}

This way, your class now just relies on a wrapper, and doesn't need the actual HttpContext to function. Makes it much easier to inject, and much easier to test:

public SiteVariation(IHttpContextBaseWrapper context)
{

}

var container = new UnityContainer();
container.RegisterType<IHttpContextBaseWrapper ,HttpContextBaseWrapper>();