MVC文件的上传、删除

public ActionResult FileUpload()
        {
            Users users = new Users();
            users = (Users)Session["Users"];
            HttpFileCollection files = System.Web.HttpContext.Current.Request.Files;//获取上传的文件
            if (files.Count == 0)//判断文件是否为空
                return Json("Faild", JsonRequestBehavior.AllowGet);
            //MD5 md5Hasher = new MD5CryptoServiceProvider();
            /*计算指定Stream对象的哈希值*/
            //byte[] arrbytHashValue = md5Hasher.ComputeHash(files[0].InputStream);
            /*由以连字符分隔的十六进制对构成的String，其中每一对表示value中对应的元素；例如“F-2C-4A”*/
            //string strHashData = BitConverter.ToString(arrbytHashValue).Replace("-", "");
            var FileName = files[0].FileName.Substring(0,files[0].FileName.IndexOf('.'));//获取文件名称
            var FileEextension = Path.GetExtension(files[0].FileName);//获取文件后缀名
            var uploadDate = DateTime.Now/*.ToString("yyyyMMddHHmm")*/;//获取文件上传时间
            var addres = "";
            //判断文件类型存入不同文件夹
            if(FileEextension == ".doc"||FileEextension == ".docx")
            {
                addres = "DOC";
            }
            if (FileEextension == ".xls" || FileEextension == ".xlsx")
            {
                addres = "Excel";
            }
            if (FileEextension == ".ppt" || FileEextension == ".pptx")
            {
                addres = "PPT";
            }
            if (FileEextension == ".pdf")
            {
                addres = "PDF";
            }
            string virtualPath = string.Format("/ResourceFile/{0}/{1}{2}", addres, FileName, FileEextension);//当前文件相对路径
            string fullFileName = Server.MapPath(virtualPath);//文件的绝对路径
            //创建文件夹，保存文件
            string path = Path.GetDirectoryName(fullFileName);
            Directory.CreateDirectory(path);//判断是否有这个路径，没有就创建
           
            string fileName = files[0].FileName.Substring(files[0].FileName.LastIndexOf("\") + 1, files[0].FileName.Length - files[0].FileName.LastIndexOf("\") - 1);
            var fileSize = GetFileSize(files[0].ContentLength);
            if (fileSize == null)
            {
                return null;
            }
            if (!System.IO.File.Exists(fullFileName))
            {
                files[0].SaveAs(fullFileName);
            }
            //添加信息
            Resource resource = new Resource();
            resource.UsersId = users.Id;
            resource.Title = FileName;
            resource.Extensions = FileEextension.Substring(1,FileEextension.Length-1);
            resource.UploadTime = uploadDate;
            resource.FileSize =Convert.ToInt32(fileSize.Substring(0,fileSize.Length-2));
            resource.UploadStage = 1;
            int i = _IExplorerRespository.Add(resource);
            if (i > 0)
            {
                return Json(new { FileName = fileName, FilePath = virtualPath, FileSize = fileSize }, "text/html", JsonRequestBehavior.AllowGet);
            }
            else
            {
                FileInfo f = new FileInfo(FileName+ FileEextension);
                DirectoryInfo dir = f.Directory;
                foreach (FileInfo item in dir.GetFiles())
                {
                    try
                    {
                        //删除文件
                        if(System.IO.File.Exists(fullFileName))
                        {
                            FileInfo fi = new FileInfo(fullFileName);
                            if(fi.Attributes.ToString().IndexOf("ReadOnly") != -1)
                            {
                                fi.Attributes = FileAttributes.Normal;
                            }
                            System.IO.File.Delete(fullFileName);
                        }
                    }
                    catch
                    {
                       
                    }
                }
            }
        }

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