How to set the Size limit in a filedialog

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Hello,

I've developed a widows application which connects to internet based database. Here is one " OpenFileDialog"...Can i set the limit of file size in its properties?

Thank You

Posted 10-Mar-11 8:47am

DEB4u

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3 solutions

Solution 2

The only official way to modify dialog's behavior beyond its property is System.Windows.Forms.FileDialog.HookProc. This is quite tricky and not portable between platforms, because platform-specific messages are involved.

I know some interesting works on CodeProject, like these ones: Extending the save file dialog class in .NET[^] (SaveFileDialog or OpenFileDialog — does not really matter), Customizing the Windows Common File Open Dialog[^].

—SA

Posted 10-Mar-11 8:57am

Sergey Alexandrovich Kryukov

Updated 10-Mar-11 9:03am

v5

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Dalek Dave 10-Mar-11 18:35pm

Good Answer

Sergey Alexandrovich Kryukov 10-Mar-11 21:08pm

Thank you.
--SA

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Yusuf · Accepted Answer · 2011-03-10T08:53:00

Solution 1

OpenFileDialog does not have file size limit. But when a user selects a file, you can check the file size.

C#

if (DialogResult.OK == openFileDialog1.ShowDialog())
{
   FileInfo fi = new FileInfo(openFileDialog1.FileNamefile);
   long fileSize = fi.Length; //The size of the current file in bytes.file 
}

Posted 10-Mar-11 8:53am

Yusuf

Comments

Sergey Alexandrovich Kryukov 10-Mar-11 14:59pm

That is correct, but does not solve the problem as OP wants.
My 5, because the problem should not be solved, in my opinion.
--SA

Sergey Alexandrovich Kryukov 10-Mar-11 15:07pm

Just for giggling, see my answer.
--SA

Yusuf 10-Mar-11 15:34pm

Thanks for accepting the answer. Good Luck with the rest!

Ian Good 10-Mar-11 17:48pm

Voted down because, while it works, using the FileOk event handler (see apaka's solution) is the preferred method.

Yusuf 10-Mar-11 22:22pm

Go head and down vote as much as you like. I am one of those who give sh*t to the rep points. Won't loose sleep because of univotes.

Since when is the "preferred" method the ONLY way. How the hell will you handle it in .net 3.5 or earlier where such events don't exist? Didn't we see all the time the mantra of MS changing all the time. It is pathetic to justify your vote. I don't care about any vote anyway. Just state this way or that way is the preferred way.

Ian Good 15-Mar-11 12:30pm

I didn't intend for you to take offense.
I simply want to others who read this topic to understand which method is accepted as standard practice & fits best with the .Net programming style.

Yusuf 15-Mar-11 14:01pm

Not at all I was not not offended by you down voting at all. It means nothing.

But your statement and your action do not match. It is one thing to state that there is a preferred way, and completely different to down vote. By down voting you not stating a preferred way, but your disagreement of the solution. Period.

So, what your action is not saying there is a preferred way, but it is stating that the solution I suggested is not a solution or bad solution. Again your argument is on "preferred" way. I am not arguing which one is preferred way. OK, that way may be the preferred, but still my suggestion does not fall down as bad or no a solution at all.

Once more, I don't care about the votes, not do I give a sh*t to it. I am only trying to point out the conflict between your word and action. That is all.

Ian Good 15-Mar-11 23:35pm

Against my better judgment, I'm replying again to try to explain what's going on here.

I gave a lower vote to this solution while giving a higher vote to the other solution
in hopes that the better method would end up at the top of the page where others could find it more easily.

If we really want to get into it - I like the other answer over yours & think this is a bad solution.
apaka's answer allows the desired behavior to be implemented (separate from the rest of the application logic) in a callback function & can provide feedback to the user about why the file was rejected before the dialog box closes--allowing the user to select a different file immediately.

Dalek Dave 10-Mar-11 18:34pm

Gets a 5 for effort!

apaka · Accepted Answer · 2011-03-10T09:02:00

Solution 3

Use the FileOK event and add this code

C#

private void openFileDialog1_FileOk(object sender, CancelEventArgs e)
{
    FileInfo info = new FileInfo(openFileDialog1.FileName);
    if (info.Length > "yourFilesize")
        e.Cancel=true;
}

Posted 10-Mar-11 9:02am

apaka

Comments

Sergey Alexandrovich Kryukov 10-Mar-11 15:05pm

There is not such event to use this handler. You did not show the event, where is that?
--SA

DEB4u 10-Mar-11 15:09pm

this size is in bytes?

apaka 10-Mar-11 15:16pm

OpenFileDialog control has two events FileOK and HelpRequest. In FileOK event you can check your file size(it's in butes) and if it doesnd match your requements just set e.Cancel to true and the file wouldn't be selected. Works for me. I'm using Net4 maybe thats the diference.

Sergey Alexandrovich Kryukov 10-Mar-11 15:39pm

Gosh, I missed it! My apologies! Good answer, my 5.
--SA

Dalek Dave 10-Mar-11 18:35pm

Good Call