Re: Question about FileDialog Permission

• Previous message: Mary Chipman: "Re: .NET Framework Configuration Tool ?"
• In reply to: Humber Consumer: "Re: Question about FileDialog Permission"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]

Date: Sun, 21 Dec 2003 14:28:16 -0800

I mispoke about there not being a way to prevent the file dialog from being
displayed. It's actually easy, the only downside being you will stop all
windows of that type from being displayed, not just the file dialog windows.
            new UIPermission(UIPermissionWindow.SafeSubWindows).Deny();
            OpenFileDialog(); // This method, that opens an OpenFileDialog,
will fail.
            CodeAccessPermission.RevertDeny(); // Revert the deny when you
want to allow dialog boxes to appear again.

Typically we'll put out a KB for a critical problem pending a fix appearing
in the next release. We'll also do a KB when we're seeing a lot of queries
about a topic that needs clarifying. In this case, the bug is a design
change request, since the file dialog is working as intended, so we didn't
request a KB. This isn't a frequently asked question, in fact I searched
our archives and didn't turn up anyone else asking about it. You did exactly
right querying this group. A good resource other than KB's and discussion
group archives is http://www.gotdotnet.com/.

Shel

-- 
This posting is provided "AS IS" with no warranties, and confers no rights.
Use of included script samples are subject to the terms specified at
http://www.microsoft.com/info/cpyright.htm
"Humber Consumer" <consumer62000@yahoo.com> wrote in message
news:5e1334d1.0312201617.5157a5bf@posting.google.com...
> thanks guys.
> I appreciate the help. I know that I can't rely on a dialog box to
> prevent file access. But I really wanted to prevent opening the dialog
> box. But now I know that there is a bug so I at least know that my
> understanding was right,
>
> By the way is there any place where you guys post all these known
> issues ( i know this is not a  very critical error but...) so that
> people like me who are trying to learn and use .NET would refer to
> that list in case they suspect something wrong.
>
> thanks
>
>
> "Shel Blauman [MSFT]" <sheldonb@online.microsoft.com> wrote in message
news:<OIGs$JyxDHA.560@TK2MSFTNGP11.phx.gbl>...
> > The primary problem was the demand for FileDialogPermission was only
> > occuring on the OpenFile Method of OpenFileDialog and SaveFileDialog.
It's
> > actually working as documented, but not necessarily as one would expect.
My
> > expectations would be for the dialog to not be displayed at all.
However,
> > you shouldn't be depending on FileDialogPermission to protect files, you
> > should be depending on FileIOPermission.  Here's a remark for
> > FileDialogPermission:
> >
> > "This permission is typically used to provide limited access to
> > user-specified files when FileIOPermission is not granted.".
> >
> > Based on the documentation the permission is working as intended.
> >
> > The bug that Ivan mentions would prevent the dialog from being displayed
at
> > all, which is what one would intuitively expect.  The soonest you could
> > expect to see that change would be the next release, but that's not
> > definite.  That won't do you any good right now anyhow, so my suggestion
is
> > to depend of FileIOPermission to protect files.  I don't know of any way
to
> > prevent the dialog itself from being displayed.
> >
> > Shel Blauman
> > -- 
> > This posting is provided "AS IS" with no warranties, and confers no
rights.
> > Use of included script samples are subject to the terms specified at
> > http://www.microsoft.com/info/cpyright.htm
> >
> >
> > "Humber Consumer" <consumer62000@yahoo.com> wrote in message
> > news:5e1334d1.0312171656.7ac5251@posting.google.com...
> > > I have .NET 1.1 and still have same problem
> > >
> > > "Ivan Medvedev [MS]" <ivanmed@online.microsoft.com> wrote in message
> >  news:<OIyh2pBxDHA.1396@TK2MSFTNGP10.phx.gbl>...
> > > > Humber -
> > > > there was a bug in the previous versions of the .NET Framework that
> > > > prevented the security check for FileDialogPermission in some cases.
> >  This
> > > > bug has been identified and is now fixed.
> > > > --Ivan
> > > > http://blogs.dotnetthis.com/ivan
> > > > This message is provided "AS IS" with no warranties, and confers no
> >  rights.
> > > >
> > > >
> > > > "Humber Consumer" <consumer62000@yahoo.com> wrote in message
> > > > news:5e1334d1.0312160918.7a764b49@posting.google.com...
> > > > > I have a doubt about the code groups and permissions .
> > > > >
> > > > > I created a C# windows app and inserted file open dialog.
> > > > >
> > > > > I open .NET config wizard and created a code groups CG1 underneath
> > > > > "Runtime Security Policy">User>COde Groups>All Code . I made the
Hash
> > > > > as the membership criteria for this group and addded my app's hash
(
> > > > > using import).
> > > > >
> > > > > I also created a Permission set where I gave all permissions
except
> > > > > "File Dialog" . I assigned this permission set to the new code
group
> > > > > that I created and also I made the code group exclusive by
checking
> > > > > "this policy ..." check box ( first one) on the general tab of
> > > > > properties of code group.
> > > > >
> > > > >
> > > > > Now when I open my application,I was expecting to get a Security
> > > > > Permission Policy exception but I did not receive and  error and
> > > > > application worked fine and was able to open the file open dialog
box.
> > > > >
> > > > > AM I missing something here?
> > > > >
> > > > > I will appreciate help/

• Previous message: Mary Chipman: "Re: .NET Framework Configuration Tool ?"
• In reply to: Humber Consumer: "Re: Question about FileDialog Permission"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] [ attachment ]