Problem handling Disk full exception

[Karl]

Hi,

I have some code that will save the contents of a Rich Text Box in
either a Text or Rich Text Format file. The code is using the
SaveFileDialog and is working correctly.

I have been testing the code and added in some exception handling to
cater for any problems. During testing I have found that if I attempt
to save to a floppy disc that is full, a System.IO.IOExc eption is raied
with the message "There is not enough space on the disk". I am catching
this exception to display a message to the user. I then Dispose of the
SaveFileDialog. I then perform Garbage Collection via GC.Collect and at
this point the exception is raised again but is not caught. Even if a
put a try around the GC.Collect and have a subsequent Catch the
exception is now handled.

Can someone explain what I'm doing wrong? I'm guessing that the
SaveFileDialog is retrying the save and I need to somehow flush it or
abort?

The code I'm using :

try
{
richTextBox.Sav eFile (saveFileDialog 1.FileName,
RichTextBoxStre amType.RichText );
}

catch (System.IO.IOEx ception ex)
{
MessageBox.Show ("Error: " + ex.Message + "\n",
"Problem Saving the Results", MessageBoxButto ns.OK);
}

saveFileDialog1 .Dispose (); // Dispose of the save file dialog

try
{
GC.Collect (); // collect the garbage
}

catch (System.IO.IOEx ception ex)
{
MessageBox.Show ("Error: " + ex.Message + "\n",
"Problem Saving the Results v2", MessageBoxButto ns.OK);
}

catch ( Exception ex )
{
MessageBox.Show ("Error: " + ex.Message + "\n",
"Problem Saving the Results v3", MessageBoxButto ns.OK);
}

[Olaf Baeyens]

Re: Problem handling Disk full exception

> Can someone explain what I'm doing wrong? I'm guessing that the[color=blue]
> SaveFileDialog is retrying the save and I need to somehow flush it or
> abort?
>[/color]
I think you want to do something like this.
No need to call the GC.Collect()

try {
try {
richTextBox.Sav eFile (saveFileDialog 1.FileName,
RichTextBoxStre amType.RichText );
} finally {
saveFileDialog1 .Dispose (); // Dispose the save file dialog
exception or not
}
} catch (System.IO.IOEx ception ex) {
MessageBox.Show ("Error: " + ex.Message + "\n",
"Problem Saving the Results v2", MessageBoxButto ns.OK);
}
}

[Willy Denoyette [MVP]]

Re: Problem handling Disk full exception


"Karl" <karl.todd@insi dertech.co.uk> wrote in message
news:1130928881 .091343.167190@ z14g2000cwz.goo glegroups.com.. .[color=blue]
>
> Hi,
>
> I have some code that will save the contents of a Rich Text Box in
> either a Text or Rich Text Format file. The code is using the
> SaveFileDialog and is working correctly.
>
> I have been testing the code and added in some exception handling to
> cater for any problems. During testing I have found that if I attempt
> to save to a floppy disc that is full, a System.IO.IOExc eption is raied
> with the message "There is not enough space on the disk". I am catching
> this exception to display a message to the user. I then Dispose of the
> SaveFileDialog. I then perform Garbage Collection via GC.Collect and at
> this point the exception is raised again but is not caught. Even if a
> put a try around the GC.Collect and have a subsequent Catch the
> exception is now handled.
>
> Can someone explain what I'm doing wrong? I'm guessing that the
> SaveFileDialog is retrying the save and I need to somehow flush it or
> abort?
>
> The code I'm using :
>
> try
> {
> richTextBox.Sav eFile (saveFileDialog 1.FileName,
> RichTextBoxStre amType.RichText );
> }
>
> catch (System.IO.IOEx ception ex)
> {
> MessageBox.Show ("Error: " + ex.Message + "\n",
> "Problem Saving the Results", MessageBoxButto ns.OK);
> }
>
> saveFileDialog1 .Dispose (); // Dispose of the save file dialog
>
> try
> {
> GC.Collect (); // collect the garbage
> }
>
> catch (System.IO.IOEx ception ex)
> {
> MessageBox.Show ("Error: " + ex.Message + "\n",
> "Problem Saving the Results v2", MessageBoxButto ns.OK);
> }
>
> catch ( Exception ex )
> {
> MessageBox.Show ("Error: " + ex.Message + "\n",
> "Problem Saving the Results v3", MessageBoxButto ns.OK);
> }
>[/color]

The problem is that whatever you try (Dispose, GC etc...) , the function
tries to flush the buffer and this is just the problem, it can't because the
is no space on disk.
What you could do (if possible) before you start writing to a disk is to
have a look whether there is anough free space to write your data. If this
isn't possible, your only option is to close the file using Win32's API
CloseHandle, only problem is how to get at the underlying file handle when
using RichTextBox.Sav eFile.

Willy.

[Karl]

Re: Problem handling Disk full exception

Thanks Willy, I thought it was something like that occurring. I'm now
going to use the System.Manageme nt functions to check if there is room
on the disk before attempting to write.

Thanks

Karl

[Michael Nemtsev]

Re: Problem handling Disk full exception

I recomend to look at Constrained Execution Regions. It's FW 2.0
feature to solve yo problem

http://msdn.microsoft.com/msdnmag/issues/05/10/Reliability/default.aspx

[Willy Denoyette [MVP]]

Re: Problem handling Disk full exception


"Michael Nemtsev" <laflour@gmail. com> wrote in message
news:1131028658 .651352.327450@ g43g2000cwa.goo glegroups.com.. .[color=blue]
>I recomend to look at Constrained Execution Regions. It's FW 2.0
> feature to solve yo problem
> http://msdn.microsoft.com/msdnmag/is...y/default.aspx
>[/color]
No, CER have nothing to do with this, please read about what they are and
where they could apply.

Willy.