Files Types

  • Thread starter Thread starter shapper
  • Start date Start date
S

shapper

Hello,

I am uploading files to a server and I need to validate the extension
of its file and get the type from it.

For example:

..doc > Microsoft Word Document

..pdf > Adobe ...

Is there a way to do this?

And if not, where can I find a list of all extensions and names given
in Windows.

Thanks,

Miguel
 
There is no absolutely reliable way to do this. The OS stores some file
associations. Internet Explorer stores some. IIS stores some. Your best bet
is to get a list of MIME types from the web and create your own data store
of them. This can be as simple as a flat file, or stored in a database.

--
HTH,

Kevin Spencer
Chicken Salad Surgeon
Microsoft MVP
 
Is there a way to do this?
Click to expand...

Following on from Kevin's reply, the following might be of some use to
you...

Supposing you have the following HTML control:
<input type="file" id="MyUpload" runat="server" />

you can add the accept tag which, depending on your browser, *might*
constrain the file patterns prompted for to match those with the
corresponding appropriate file extensions for the platform:
http://www.cs.tut.fi/~jkorpela/forms/file.html

E.g. <input type="file" id="MyUpload" runat="server"
accept="application/msword,application/pdf" />

Then, server-side, you can do the following:

// validate the file extention
if(Path.GetExtension(MyUpload.PostedFile.FileName) != ".doc" &&
Path.GetExtension(MyUpload.PostedFile.FileName) != ".pdf")
{
// do something here
}
// validate the MIME type
if(MyUpload.PostedFile.ContentType != "application/msword" &&
MyUpload.PostedFile.ContentType != "application/pdf")
{
// do something here
}

The <asp:FileUpload> webcontrol renders an HTML <input type="file"> control.

However, as Kevin states, this is not 100% reliable...
 
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