从HttpPostedFileBase.InputStream减少从内存中获取的JPG文件大小

Question

我有图片上传功能。

有没有人知道如何从HttpPostedFileBase减小JPG图像的大小而不必将文件保存到硬盘？如果可能的话，我想把这一切都留在记忆里。

[HttpPost]
public ActionResult UploadMultipleImages(List<HttpPostedFileBase> files)
{
    Decimal decTN = Convert.ToDecimal(Request.Form["TN"].ToString());
    Decimal decCN = Convert.ToDecimal(Request.Form["CN"].ToString());

    Parallel.ForEach(files, file =>
    {
        String extension = Path.GetExtension(file.FileName);

        String strTitleForImage = Request.Form["TitleOfImage"].ToString();
        String strDescription = Request.Form["Description"].ToString();
        Int32 intDateTaken = Convert.ToInt32(Request.Form["DateTaken"].ToString().Replace("-", ""));

        String strBase64Value = "";
        Stream inputStream = file.InputStream;

        // Can I reduce JPG file here in memory?

        strBase64Value = ToBase64(inputStream);
        InsertImage(decTN, strTitleForImage, intDateTaken, strDescription, strBase64Value);
        }
    });

    return RedirectToAction("Index/" + decTN + "/" + decCN);
}