ASP.Net处理程序请求.文件始终为空

我正在为客户端编写一个C#ASP.Net应用程序，以便将文件发布到其他服务器。我正在使用一个通用处理程序来处理从客户端到服务器的已发布文件。但在我的处理程序中，上下文。请求。文件始终为空（0计数）。我相信我的post方法是正确的，因为当我试图将处理程序移动到与客户端相同的域中时，我可以接受文件并保存它们。但问题是我需要将文件保存到另一台服务器。

以下是发布文件的代码：

    private void UploadFilesToRemoteUrl3(HttpFileCollection files)
    {
        string url = "http://localhost:19107/Catalog/api/dashboard/ImageHandler.ashx";
        long length = 0;
        string boundary = "----------------------------" +
        DateTime.Now.Ticks.ToString("x");
        HttpWebRequest httpWebRequest2 = (HttpWebRequest)WebRequest.Create(url);
        httpWebRequest2.ContentType = "multipart/form-data; boundary=" + boundary;
        httpWebRequest2.Method = "POST";
        httpWebRequest2.KeepAlive = true;
        httpWebRequest2.Credentials =
        System.Net.CredentialCache.DefaultCredentials;
        Stream memStream = new System.IO.MemoryStream();
        byte[] boundarybytes = System.Text.Encoding.ASCII.GetBytes("'r'n--" + boundary + "'r'n");
        memStream.Write(boundarybytes,0,boundarybytes.Length);
        length += boundarybytes.Length;
        string headerTemplate = "Content-Disposition: form-data; name='"{0}'"; filename='"{1}'"'r'n Content-Type: application/octet-stream'r'n'r'n";
        foreach (string s in files)
        {
            HttpPostedFile file = files[s];
            string header = string.Format(headerTemplate, "file", file.FileName);
            byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
            memStream.Write(headerbytes,0,headerbytes.Length);
            length += headerbytes.Length;
            byte[] buffer = new byte[1024];
            int bytesRead = 0;
            while ( (bytesRead = file.InputStream.Read(buffer, 0, buffer.Length)) != 0 )
            {
                memStream.Write(buffer, 0, bytesRead);
                length += bytesRead;
            }
            memStream.Write(boundarybytes,0,boundarybytes.Length);
            length += boundarybytes.Length;
            file.InputStream.Close();
        }
        httpWebRequest2.ContentLength = memStream.Length;
        Stream requestStream = httpWebRequest2.GetRequestStream();
        memStream.Position = 0;
        byte[] tempBuffer = new byte[memStream.Length];
        memStream.Read(tempBuffer,0,tempBuffer.Length);
        memStream.Close();
        requestStream.Write(tempBuffer,0,tempBuffer.Length );
        requestStream.Close();
        WebResponse webResponse2 = httpWebRequest2.GetResponse();
        Stream stream2 = webResponse2.GetResponseStream();
        StreamReader reader2 = new StreamReader(stream2);
        string a = reader2.ReadToEnd();
        webResponse2.Close();
        httpWebRequest2 = null;
        webResponse2 = null;
    }

下面是我的处理程序后面接收文件的代码：

    public void ProcessRequest(HttpContext context)
    {
        context.Request.ContentType = "multipart/form-data";
        int count = context.Request.Files.Count; //always 0
        foreach (string s in context.Request.Files)
        {
            string response = "";
            HttpPostedFile file = context.Request.Files[s];
            //code to save files
        }
    }

   public Response<List<string>> UplaoadPostImage()
    {
        Response<List<string>> response = new Response<List<string>>();
        ResponseImage objtemp = new ResponseImage();
        List<string> objlist = new List<string>();
        try
        {
            HttpContextWrapper objwrapper = GetHttpContext(this.Request);
            HttpFileCollectionBase collection = objwrapper.Request.Files;
            if (collection.Count > 0)
            {
                foreach (string file in collection)
                {
                    HttpPostedFileBase file1 = collection.Get(file);
                    Stream requestStream = file1.InputStream;
                    Image img = System.Drawing.Image.FromStream(requestStream);
                    //Image UserImage = objcommon.ResizeImage(img, 600, 600);
                    string UniqueFileName = file1.FileName;
                    img.Save(HttpContext.Current.Request.PhysicalApplicationPath + "UploadImage''" + UniqueFileName, System.Drawing.Imaging.ImageFormat.Png);
                    objlist.Add(ConfigurationManager.AppSettings["ImagePath"] + UniqueFileName);
                    requestStream.Close();
                }
                response.Create(true, 0, Messages.FormatMessage(Messages.UploadImage_Sucess, ""), objlist);
            }
            else
            {
                response.Create(false, 0, "File not found.", objlist);
            }
        }
        catch (Exception ex)
        {
            response.Create(false, -1, Messages.FormatMessage(ex.Message), objlist);
        }
        return response;
    }
    private HttpContextWrapper GetHttpContext(HttpRequestMessage request = null)
    {
        request = request ?? Request;
        if (request.Properties.ContainsKey("MS_HttpContext"))
        {
            return ((HttpContextWrapper)request.Properties["MS_HttpContext"]);
        }
        else if (HttpContext.Current != null)
        {
            return new HttpContextWrapper(HttpContext.Current);
        }
        else
        {
            return null;
        }
    }