如果文件全部存在，如何创建新文件夹？

本文介绍了如果文件全部存在，如何创建新文件夹？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在上传图片，但是如果某个图片同名，那么图片覆盖... !!那我该怎么办？ 我可能需要创建新文件夹才能存储此图像吗？或者其他可能解决方案？ 如果我必须创建新文件夹，那么这个怎么可能我要编写什么代码？ 我尝试过： [HttpPost] 公共ActionResult索引（上传上传，HttpPostedFileBase文件） { if（File == null） { ModelState .AddModelError（customeerror，请上传你的文件）; } try { //字符串文件名= Guid.NewGuid（）+ Path.GetExtension（File.FileName）; string filename = Path.GetFileName （File.FileName）; File.SaveAs（Path.Combine（Server.MapPath（〜/ uploadcv），filename））; using（NGOEntities1 db =新的NGOEntities1（）） { upload.resum e =文件名; db.uploads.Add（上传）; db.SaveChanges（）; } ModelState.Clear（）; upload = null; ViewBag.message =Succcess; } catch（例外情况） { ViewBag.message =错误; 返回查看（）; } 返回RedirectToAction（list）; }

i am uploading image but if some image with same name then image override ...!! so what can i do ?? may i have to create new folder to store this image ? or what other possibly solution ?? if i have to create new folder then how this posible what code i have to write ?? What I have tried: [HttpPost] public ActionResult Index(upload upload,HttpPostedFileBase File) { if (File == null) { ModelState.AddModelError("customeerror", "Please Upload Your file"); } try { // string filename = Guid.NewGuid() + Path.GetExtension(File.FileName); string filename = Path.GetFileName(File.FileName); File.SaveAs(Path.Combine(Server.MapPath("~/uploadcv"), filename)); using (NGOEntities1 db = new NGOEntities1()) { upload.resume = filename; db.uploads.Add(upload); db.SaveChanges(); } ModelState.Clear(); upload = null; ViewBag.message = "Succcess"; } catch(Exception Ex) { ViewBag.message = "Error"; return View(); } return RedirectToAction("list"); }

推荐答案

使用 File.Exists [ ^ ]查看文件是否已存在，如果它确实改变它就像在最后添加一个数字，然后再次检查，依此类推，直到你提交一个不存在的文件。 承担考虑到人们同时上传，你可能想要围绕这段代码实现锁定。 Use File.Exists[^] to see if the file already exists, and if it does alter it like adding a number to the end, then checking again and so on until you file a file that doesn't exist. Bear in mind people uploading at the same time though, you might want to implement locking around this code.