Question

System.Web.UI.HtmlControls.HtmlInputFile - Can't check if junk is typed into text field

Asked by: NESupply

I have in my C#/asp.net
System.Web.UI.HtmlControls.HtmlInputFile MyFile;

if ((MyFile.PostedFile.ContentLength  == 0) && (MyFile.PostedFile.FileName != ""))
 {
                strFileName = MyFile.PostedFile.FileName;
                FileUploadMsgLB.Text = "An Error occured. Please check the attached file: " + strFileName;
                return;
 }

It works fine,but if the user types junk into the text area (say "asdfg") my catch or If statements don't seem to be triggered and the web just sits there when the submit button is hit.

Funny thing is if the user types junk into the text area(say "c:asdfg" or "c:\asdfg" or "a:asdfg" ...) my catch statement is hit and error label is updated.





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Asked On
2006-08-04 at 06:50:40ID21943421
Topic

C# Programming Language

Participating Experts
2
Points
125
Comments
2

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Answers

 

by: mrichmonPosted on 2006-08-04 at 08:38:50ID: 17250836

My guess:

>>the web just sits there when the submit button is hit.

That is because the browser is trying to locate that file for the user to submit it.  It can't locate so probably times out looking at the various different paths that it has in the order it is set to look.

>>c:\asdfg
in that case it is looking at a specific path and doesn't find it there, but also doesn't look elsewhere.

 

by: tokabiPosted on 2006-08-04 at 08:52:55ID: 17250978

Could you check that the file exists before running the rest of the code, using :

File.Exists(path);

or check the format of the filename with a regular expression, something like :

Regex myRX = new Regex(@"[A-Z]|[a-z]:\\.+");

f (myRX.IsMatch(MyFile.PostedFile.FileName))
{
      // do stuff
}
else
{
      // or not
}

20120131-EE-VQP-002

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