防止文件重名方法

 

  protected
   
  void
   btnUpload_Click(
  object
   sender, EventArgs e)
 {
 
  if
   (upload1.HasFile)
 {
 HttpPostedFile file 
  =
   upload1.PostedFile;
 
  string
   extension 
  =
   Path.GetExtension(file.FileName);
 
  string
   fileName 
  =
   DateTime.Now.ToString(
  "
  yyyyMMddhhmmss
  "
  ) 
  +
   extension;
 
  string
   path 
  =
   Server.MapPath(
  "
  uploads
  "
  );
 
  string
   savePath 
  =
   Path.Combine(path, fileName);
 
  //
  Response.Write(savePath);
  

   
  string
   imagePath 
  =
   
  "
  uploads/
  "
   
  +
   fileName;
 file.SaveAs(savePath);
 
  if
   (extension.Equals(
  "
  .bmp
  "
  ) 
  ||
   extension.Equals(
  "
  .jpg
  "
  ) 
  ||
   extension.Equals(
  "
  .gif
  "
  ))
 {
 Image1.ImageUrl 
  =
   imagePath;
 }
 }
 }

 

1.重新命名成yyyyMMddhhmmss＋后缀名的文件就行了。
2.Guid
3.yyyyMMddhhmmss+原文件名