利用HttpWebRequest上传文件

参考代码：

http://www.cnblogs.com/charles001/articles/1031515.html 

1.给定UploadUrl地址

  public void UploadFile(Stream postedStream, string fileName,
             string uploadURL, string fileGroup, string fileType,
            string specialPath, string userName, string uploadType)
        {
            if (String.IsNullOrEmpty(uploadURL))
            {
                throw new Exception("上传路径为空！");
            }

            HttpWebRequest webRequest = WebRequest.Create(uploadURL) as HttpWebRequest;
            if (webRequest == null)
            {
                throw new Exception(String.Format("{0},地质创建失败！", uploadURL));
            }

            webRequest.Method = WebRequestMethods.Http.Post;

            WebProxy proxy = new WebProxy();
            proxy.UseDefaultCredentials = true;
            webRequest.Proxy = proxy;

            webRequest.ContentType = "application/x-www-form-urlencoded";
            webRequest.ContentLength = postedStream.Length;
            webRequest.Headers.Add("FileGroup", fileGroup);
            webRequest.Headers.Add("FileType", fileType);
            webRequest.Headers.Add("UploadType", uploadType);
            webRequest.Headers.Add("FileName", System.Web.HttpUtility.UrlEncode(fileName));
            webRequest.Headers.Add("UserName", userName);
            webRequest.Headers.Add("SpecialFolderPath", System.Web.HttpUtility.UrlEncode(specialPath));

            using (Stream responstStream = webRequest.GetRequestStream())
            {

                const int bufferLen = 65000;
                byte[] buffer = new byte[bufferLen];
                int count = 0;
                while ((count = postedStream.Read(buffer, 0, bufferLen)) > 0)
                {
                    responstStream.Write(buffer, 0, count);
                }
                responstStream.Close();
                responstStream.Close();
            }

            try
            {
                webRequest.GetResponse().Close();
            }
            catch (WebException ex)
            {
                HttpWebResponse response = ex.Response as HttpWebResponse;
                if (response != null)
                {
                    throw new WebException(response.StatusDescription, ex);
                }
                throw ex;
            }
            catch (Exception exception)
            {
                throw exception;
            }
        }

mvc前台接受传递过来的文件

public ActionResult About()
        {

            var keys = Request.Headers.Keys;
            Stream stream = Request.InputStream;

            var FileGroup = Request.Headers["FileGroup"];
            var FileType = Request.Headers["FileType"];
            var UploadType = Request.Headers["UploadType"];
            var FileName = Request.Headers["FileName"];
            var UserName = Request.Headers["UserName"];
            var SpecialFolderPath = Request.Headers["SpecialFolderPath"];
            UploadFileModel fileModel = new UploadFileModel
            {
                FileGroup = FileGroup,
                FileLength = 11,
                UploadType = UploadType,
                FileName = System.Web.HttpUtility.UrlDecode(FileName),
                FileType = FileType,
                UserName = UserName
            };

            String savePath = Server.MapPath("~/Content/File");
           // String path = savePath + FileName;
            string filePath = Path.Combine(savePath, FileName);
            try
            {


            StreamReader sr = new StreamReader(stream);
            Stream sw = new FileStream(filePath, FileMode.Create,FileAccess.Write,FileShare.None); 
            const int bufferLen = 65000;
            byte []buff = new byte[bufferLen];
            int index = 0;
            while ((index = stream.Read(buff, 0, bufferLen)) > 0)
            {
                sw.Write(buff, 0, index);
            }
            sw.Flush();
            sw.Close();
            }
            catch (Exception)
            {

                ;
            }
            return View(fileModel);
        }