如何在Unity中实现这个(HttpContext)依赖？

Question

我们有一个依赖于的类HttpContext.我们已经实现了这样:

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

现在我想要做的是实例化SiteVariation类Unity,所以我们可以创建一个构造函数.但我不知道如何HttpContextWrapper(HttpContext.Current))在配置方式中在Unity中配置这个新功能.

ps这是我们使用的配置方式

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

Answer 1

Microsoft已经构建了很好的包装和抽象HttpContext,HttpRequest并且HttpResponse包含在.NET中,所以我肯定会直接使用它们而不是自己包装它们.

您可以HttpContextBase使用InjectionFactory如下配置Unity for :

var container = new UnityContainer(); 

container.RegisterType<HttpContextBase>(new InjectionFactory(_ => 
    new HttpContextWrapper(HttpContext.Current)));

另外,如果你需要HttpRequestBase(我倾向于使用最多)HttpResponseBase,你可以这样注册:

container.RegisterType<HttpRequestBase>(new InjectionFactory(_ => 
    new HttpRequestWrapper(HttpContext.Current.Request)));

container.RegisterType<HttpResponseBase>(new InjectionFactory(_ => 
    new HttpResponseWrapper(HttpContext.Current.Response)));

您可以轻松地模拟HttpContextBase,HttpRequestBase并HttpResponseBase在没有自定义包装器的单元测试中.

Answer 2

我不会HttpContextBase直接依赖.我会在它周围创建一个包装器,并使用你需要的位:

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

那么实施:

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
}

这样,您的类现在只依赖于包装器,并且不需要实际的HttpContext来运行.使注入更容易,并且更容易测试:

public SiteVariation(IHttpContextBaseWrapper context)
{

}

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