How to filter file types when using the HTMLInputFile control...

[Asela Gunawardena]

On my Web Servers, I don't want to allow visitors to upload executables.
There are many types of files that i want to ignore (for instance: exe,dll,
bat, cmd .etc). I have an ASPX page with an HTMLInputFile control which
uploads the files. Is it possible to set a filter when the user clicks the
Browse button so that the
file selection dialog only displays valid formats specified.

thankx in advance

Asela Gunawardena.

 

[dbottjer]

You could maintain a list of acceptable file types in a collection and then
loop through this collection checking it against the file being uploaded.
You would need to use some VB.NET code like this:

fileExtension = Mid(fileName, InStrRev(fileName, ".") + 1)

To figure out the file extension of the uploaded file.

 

[Asela Gunawardena]

thankx, but this of course i do check. what i would like to know is whether
there is a way of restricting the user select the unnessary formats when the
file dialog appears; making only the relavant types appear.