如何将 HttpRequestBase 转换为 HttpRequest 对象？

Question

在我的 ASP.NET MVC 控制器中，我有一个需要 HttpRequest 对象的方法。我只能访问一个 HttpRequestBase 对象。

无论如何我可以以某种方式转换它吗？

我可以/应该做什么？？

Answer 1

通常，当您需要在控制器操作中访问 HttpContext 属性时，您可以在设计方面做得更好。

例如，如果您需要访问当前用户，请为您的操作方法提供IPrincipal 类型的参数，您可以使用Attribute 填充该参数，并在测试时根据需要进行模拟。有关如何操作的小示例，请参阅this blog post，特别是第 7 点。

Answer 2

是你的方法，所以你可以重写它来取HttpRequestBase？如果没有，您始终可以从HttpContext.Current.HttpRequest 获取当前的HttpRequest 以传递。但是，我经常将对 HttpContext 的访问封装在 ASP.NET: Removing System.Web Dependencies 中提到的类中，以获得更好的单元测试支持。

Answer 3

尝试使用您的 HttpRequestBase 来使用/创建一个 HttpRequestWrapper。

Answer 4

正如凯文所说的那样。

我使用静态方法来检索HttpContext.Current.Request，因此总是有一个HttpRequest 对象以供需要时使用。

在类助手中

public static HttpRequest GetRequest()
{
    return HttpContext.Current.Request;
}

在控制器中

if (AcessoModel.UsuarioLogado(Helper.GetRequest()))

在此查看

bool bUserLogado = ProjectNamespace.Models.AcessoModel.UsuarioLogado(
                      ProjectNamespace.Models.Helper.GetRequest()
                   );

if (bUserLogado == false) { Response.Redirect("/"); }

我的方法 UsuarioLogado

public static bool UsuarioLogado(HttpRequest Request)

Answer 5

没有办法在这些类型之间进行转换。

我们有一个类似的案例。我们重写了我们的类/Web 服务方法，以便它们使用 HttpContextBase、HttpApplicationStateBase、HttpServerUtilityBase、HttpSessionStateBase... 而不是没有“Base”后缀的关闭名称类型（HttpContext，... HttpSessionState）。使用自制的 mock 更容易处理。

很抱歉你没能做到。

Answer 6

您应该始终在应用程序中使用 HttpRequestBase 和 HttpResponseBase，而不是无法测试的具体版本（没有 typemock 或其他魔法）。

只需使用HttpRequestWrapper类进行转换，如下所示。

var httpRequestBase = new HttpRequestWrapper(Context.Request);

Answer 7

你可以使用

System.Web.HttpContext.Current.Request

这里的关键是您需要完整的命名空间才能访问“正确的”HttpContext。

我知道这个问题被问到已经 4 年了，但是如果这对某人有帮助，那么你就去吧！

（编辑：我看到 Kevin Hakanson 已经给出了这个答案......所以希望我的回答能帮助那些只阅读答案而不是 cmets 的人。）:)

Answer 8

这是一个 ASP.Net MVC 3.0 AsyncController，它接受请求，将入站 HttpRequestBase MVC 对象转换为 System.Web.HttpWebRequest。然后它异步发送请求。当响应返回时，它将 System.Web.HttpWebResponse 转换回 MVC HttpResponseBase 对象，该对象可以通过 MVC 控制器返回。

要明确回答这个问题，我想您只会对 BuildWebRequest() 函数感兴趣。但是，它演示了如何在整个管道中移动 - 从 BaseRequest > Request 然后 Response > BaseResponse 转换。我认为分享两者会很有用。

通过这些类，您可以拥有一个充当 Web 代理的 MVC 服务器。

希望这会有所帮助！

控制器：

[HandleError]
public class MyProxy : AsyncController
{
    [HttpGet]
    public void RedirectAsync()
    {
        AsyncManager.OutstandingOperations.Increment();

        var hubBroker = new RequestBroker();
        hubBroker.BrokerCompleted += (sender, e) =>
        {
            this.AsyncManager.Parameters["brokered"] = e.Response;
            this.AsyncManager.OutstandingOperations.Decrement();
        };

        hubBroker.BrokerAsync(this.Request, redirectTo);
   }

    public ActionResult RedirectCompleted(HttpWebResponse brokered)
    {
        RequestBroker.BuildControllerResponse(this.Response, brokered);
        return new HttpStatusCodeResult(Response.StatusCode);
    }
}

这是完成繁重工作的代理类：

namespace MyProxy
{
    /// <summary>
    /// Asynchronous operation to proxy or "broker" a request via MVC
    /// </summary>
    internal class RequestBroker
    {
        /*
         * HttpWebRequest is a little protective, and if we do a straight copy of header information we will get ArgumentException for a set of 'restricted' 
         * headers which either can't be set or need to be set on other interfaces. This is a complete list of restricted headers.
         */
        private static readonly string[] RestrictedHeaders = new string[] { "Accept", "Connection", "Content-Length", "Content-Type", "Date", "Expect", "Host", "If-Modified-Since", "Range", "Referer", "Transfer-Encoding", "User-Agent", "Proxy-Connection" };

        internal class BrokerEventArgs : EventArgs
        {
            public DateTime StartTime { get; set; }

            public HttpWebResponse Response { get; set; }
        }

        public delegate void BrokerEventHandler(object sender, BrokerEventArgs e);

        public event BrokerEventHandler BrokerCompleted;

        public void BrokerAsync(HttpRequestBase requestToBroker, string redirectToUrl)
        {
            var httpRequest = BuildWebRequest(requestToBroker, redirectToUrl);

            var brokerTask = new Task(() => this.DoBroker(httpRequest));
            brokerTask.Start();
        }

        private void DoBroker(HttpWebRequest requestToBroker)
        {
            var startTime = DateTime.UtcNow;

            HttpWebResponse response;
            try
            {
                response = requestToBroker.GetResponse() as HttpWebResponse;
            }
            catch (WebException e)
            {
                Trace.TraceError("Broker Fail: " + e.ToString());

                response = e.Response as HttpWebResponse;
            }

            var args = new BrokerEventArgs()
            {
                StartTime = startTime,
                Response = response,
            };

            this.BrokerCompleted(this, args);
        }

        public static void BuildControllerResponse(HttpResponseBase httpResponseBase, HttpWebResponse brokeredResponse)
        {
            if (brokeredResponse == null)
            {
                PerfCounters.ErrorCounter.Increment();

                throw new GriddleException("Failed to broker a response. Refer to logs for details.");
            }

            httpResponseBase.Charset = brokeredResponse.CharacterSet;
            httpResponseBase.ContentType = brokeredResponse.ContentType;

            foreach (Cookie cookie in brokeredResponse.Cookies)
            {
                httpResponseBase.Cookies.Add(CookieToHttpCookie(cookie));
            }

            foreach (var header in brokeredResponse.Headers.AllKeys
                .Where(k => !k.Equals("Transfer-Encoding", StringComparison.InvariantCultureIgnoreCase)))
            {
                httpResponseBase.Headers.Add(header, brokeredResponse.Headers[header]);
            }

            httpResponseBase.StatusCode = (int)brokeredResponse.StatusCode;
            httpResponseBase.StatusDescription = brokeredResponse.StatusDescription;

            BridgeAndCloseStreams(brokeredResponse.GetResponseStream(), httpResponseBase.OutputStream);
        }

        private static HttpWebRequest BuildWebRequest(HttpRequestBase requestToBroker, string redirectToUrl)
        {
            var httpRequest = (HttpWebRequest)WebRequest.Create(redirectToUrl);

            if (requestToBroker.Headers != null)
            {
                foreach (var header in requestToBroker.Headers.AllKeys)
                {
                    if (RestrictedHeaders.Any(h => header.Equals(h, StringComparison.InvariantCultureIgnoreCase)))
                    {
                        continue;
                    }                   

                    httpRequest.Headers.Add(header, requestToBroker.Headers[header]);
                }
            }

            httpRequest.Accept = string.Join(",", requestToBroker.AcceptTypes);
            httpRequest.ContentType = requestToBroker.ContentType;
            httpRequest.Method = requestToBroker.HttpMethod;

            if (requestToBroker.UrlReferrer != null)
            {
                httpRequest.Referer = requestToBroker.UrlReferrer.AbsoluteUri;
            }

            httpRequest.UserAgent = requestToBroker.UserAgent;

            /* This is a performance change which I like.
             * If this is not explicitly set to null, the CLR will do a registry hit for each request to use the default proxy.
             */
            httpRequest.Proxy = null;

            if (requestToBroker.HttpMethod.Equals("POST", StringComparison.InvariantCultureIgnoreCase))
            {
                BridgeAndCloseStreams(requestToBroker.InputStream, httpRequest.GetRequestStream());
            }

            return httpRequest;
        }

        /// <summary>
        /// Convert System.Net.Cookie into System.Web.HttpCookie
        /// </summary>
        private static HttpCookie CookieToHttpCookie(Cookie cookie)
        {
            HttpCookie httpCookie = new HttpCookie(cookie.Name);

            foreach (string value in cookie.Value.Split('&'))
            {
                string[] val = value.Split('=');
                httpCookie.Values.Add(val[0], val[1]);
            }

            httpCookie.Domain = cookie.Domain;
            httpCookie.Expires = cookie.Expires;
            httpCookie.HttpOnly = cookie.HttpOnly;
            httpCookie.Path = cookie.Path;
            httpCookie.Secure = cookie.Secure;

            return httpCookie;
        }

        /// <summary>
        /// Reads from stream into the to stream
        /// </summary>
        private static void BridgeAndCloseStreams(Stream from, Stream to)
        {
            try
            {
                int read;
                do
                {
                    read = from.ReadByte();

                    if (read != -1)
                    {
                        to.WriteByte((byte)read);
                    }
                }
                while (read != -1);
            }
            finally 
            {
                from.Close();
                to.Close();
            }
        }
    }
}

Answer 9

要在 ASP.NET MVC4 .NET 4.5 中获取 HttpRequest，您可以执行以下操作：

this.HttpContext.ApplicationInstance.Context.Request