如果文件全部存在，如何创建新文件夹？ [英] How to create new folder if file is allread present ?
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.
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