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upload file

  Asked By: Holly    Date: Apr 23    Category: Asp.net    Views: 1197
  

how can i know what is the extension of an upload file.
i want to restrict EXE and maybe other files from uploading.

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3 Answers Found

 
Answer #1    Answered By: Adanalie Garcia     Answered On: Apr 23

im making file upload  user control.
one of the control properties is the allowed formats:
myUpload.allowedFormats = "gif|jpg|doc|txt|ppt|xls|htm|html";

now,i took the file  name and split the name and compare this string (split it
also) to the file extension.

it is not a good approch since a person can rename the file name to something
like:

myFile.jpg.exe

...

so what is the solution?if im taking myFile.postedFile.contentType

im getting in word application upload : application\msword...

i need the extension to compare to what the developer put in the property
(doc,htm...)

 
Answer #2    Answered By: Ginger Snyder     Answered On: Apr 23

This probably isn't the greatest solution, but you could determine your file
extentions in the following way:


string allowedFormats = "|gif|jpg|doc|txt|ppt|xls|htm|html|";
string x = "file.jpg";
Response.Write(x.Split(new char[] {'.'}, 2)[1] + "<br>");
if (allowedFormats.IndexOf("|" + x.Split(new char[] {'.'}, 2)[1] + "|") >
0 )
{
Response.Write("this extension is ok<br>");
}
else
{
Response.Write("this extension is NOT ok<br>");
}

string y = "file.jpg.ext";
Response.Write(y.Split(new char[] {'.'}, 2)[1] + "<br>");
if (allowedFormats.IndexOf("|" + y.Split(new char[] {'.'}, 2)[1] + "|") >
0 )
{
Response.Write("this extension is ok<br>");
}
else
{
Response.Write("this extension is NOT ok<br>");
}

The first filename, variable "x" - will print "this extension is ok" where
variable "y" will print "this extension is NOT ok"

 
Answer #3    Answered By: Jimmy Abp     Answered On: Apr 23

How about System.IO.Path.GetExtension() ?

look up the whole System.IO.Path "tree" on MSDN, you'll find lots of
goodies that should help in building an uploader.

 
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