How to get file extension of uploaded file RSS

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  knightmare1

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  How to get file extension of uploaded file

  Oct 30, 2004 05:43 PM|LINK

  Heres a simlpe one. How do i get the file extension of an uploaded file or any file for that matter without using any of the substring or split functions. I thought File.PostedFile would contain a property like that but it was not to be. Thanks in advance.
  • Locked by Mikesdotnetting on Sep 03, 2010 08:55 PM
  • Locked by Mikesdotnetting on Sep 03, 2010 08:55 PM
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  cahyde

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  Re: How to get file extension of uploaded file

  Oct 30, 2004 06:33 PM|LINK

  As far as I know, the only way to get the extension is to parse it out...out of curiosity, why do you not want to use any of the string methods for parsing? Chris
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  dmateer

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  Re: How to get file extension of uploaded file

  Oct 30, 2004 07:09 PM|LINK

  I totally agree with the previous response but thought I would add a few other options which *may* help, depending if they are usable in your situation. (Without additional background, I'm not sure if they would apply or not.) (1) The HttpPostedFile object does contain a ContentType property that contains the MIME type, i.e. "video/mpeg", etc. Depending on what you are trying to do, this value may be useful. Here is more information: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemWebHttpPostedFileClassContentTypeTopic.asp (2) If you save the PostedFile (via the SaveAs method, using the same filename), you can then create a FileInfo object on that file. This FileInfo object contains a whole mess of useful properties, including Extension. You would have to save it to the file system first, though, which may not be convenient in your situation. http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfSystemIOFileInfoClassTopic.asp Again, most likely the easiest thing to do is use the SubString method along with the LastIndexOf method of the PostedFile.FileName.
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  nicequy

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  Re: How to get file extension of uploaded file

  Oct 30, 2004 07:33 PM|LINK

  Actually...will this work for you?

  string ext = System.IO.Path.GetExtension(this.File1.PostedFile.FileName);

  Hope this helps!
  Jason Conway
  
  MCP, MCTS, Certified SCRUM Master
  
  asp.net blog
  
  • Marked as answer by Mikesdotnetting on Sep 03, 2010 08:54 PM
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  knightmare1

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  Re: How to get file extension of uploaded file

  Oct 30, 2004 10:50 PM|LINK

  Worked perfectly 'nicequy'. Thanks for the code. I would have preferred if you could do it on the PostedFile object , before storing it on the local drive. But i guess i'm asking for too much. Thanks for the help you all.
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  nicequy

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  Re: How to get file extension of uploaded file

  Oct 30, 2004 11:22 PM|LINK

  You can!!! That is what my File1 object is in my example. You just need to put runat="server" on the tag like this:

  <input runat="server" type="file" id="">

  and then ensure that it is referenced in your code behind like this:

  public class YourPage : System.Web.UI.Page{
       protected System.Web.UI.HtmlControls.HtmlInputFile File1;

  and then you can just reference it in code

  if(this.File1.PostedFile != null) string ext = System.IO.Path.GetExtension(this.File1.PostedFile.FileName);

  Let me know how it goes!
  Jason Conway
  
  MCP, MCTS, Certified SCRUM Master
  
  asp.net blog
  
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  vsureshvarma

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  Re: How to get file extension of uploaded file

  Jun 11, 2009 11:40 AM|LINK

   thankyou sir Its is working fine
  

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  raj1281.bece

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  Re: How to get file extension of uploaded file

  Jun 11, 2009 11:51 AM|LINK

  Hi,

  You can get file extension without any split or substring. Just use in build function of io.path.getextension as below :
  

  string strFileExtension = System.IO.Path.GetExtension(FileUploader1.PostedFile.FileName);

  
  

  Regards,
  Rajesh Khunt
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  raj1281.bece

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  Re: How to get file extension of uploaded file

  Jun 11, 2009 11:52 AM|LINK

  Hi,

  You can get file extension without any split or substring. Just use in built function of io.path.getextension as below :
  

  string strFileExtension = System.IO.Path.GetExtension(FileUploader1.PostedFile.FileName);

  
  

  Regards,
  Rajesh Khunt
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  malcolms

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  Re: How to get file extension of uploaded file

  Jun 11, 2009 12:10 PM|LINK

  If you want to get the extension you can use the Path class.  Something like this:
  

  string extension = Path.GetExtension(FileUpLoad1.FileName);