上传控件FineUploader后台获取文件对象实例

public virtual ActionResult AsyncUpload()
{
　　//we process it distinct ways based on a browser
　　//find more info here http://stackoverflow.com/questions/4884920/mvc3-valums-ajax-file-upload
　　Stream stream = null;
　　var fileName = "";
　　var contentType = "";
　　if (String.IsNullOrEmpty(Request["qqfile"]))
　　{
　　　　// IE
　　　　HttpPostedFileBase httpPostedFile = Request.Files[0];
　　　　if (httpPostedFile == null)
　　　　　　throw new ArgumentException("No file uploaded");
　　　　stream = httpPostedFile.InputStream;
　　　　fileName = Path.GetFileName(httpPostedFile.FileName);
　　　　contentType = httpPostedFile.ContentType;
　　}
　　else
　　{
　　　　//Webkit, Mozilla
　　　　stream = Request.InputStream;
　　　　fileName = Request["qqfile"];
　　}

　　var fileBinary = new byte[stream.Length];
　　stream.Read(fileBinary, 0, fileBinary.Length);

　　var fileExtension = Path.GetExtension(fileName);
　　if (!String.IsNullOrEmpty(fileExtension))
　　　　fileExtension = fileExtension.ToLowerInvariant();

　　var download = new Download
　　{
　　　　DownloadGuid = Guid.NewGuid(),
　　　　UseDownloadUrl = false,
　　　　DownloadUrl = "",
　　　　DownloadBinary = fileBinary,
　　　　ContentType = contentType,
　　　　//we store filename without extension for downloads
　　　　Filename = Path.GetFileNameWithoutExtension(fileName),
　　　　Extension = fileExtension,
　　　　IsNew = true
　　};
　　_downloadService.InsertDownload(download);

　　//when returning JSON the mime-type must be set to text/plain
　　//otherwise some browsers will pop-up a "Save As" dialog.
　　return Json(new { success = true, 
　　downloadId = download.Id, 
　　downloadUrl = Url.Action("DownloadFile", new { downloadGuid= download.DownloadGuid }) },
　　MimeTypes.TextPlain);
}