OpenFileDialog() - How to set the MultiSelect option based on the file filter?

Question

OpenFileDialog() - How to set the MultiSelect option based on the file filter?

My OpenFileDialog can select 2 types of files. This is the Filter used:

"LFA or log files (.lfa, .log)|.lfa;.log"

With MultiSelect property set to false.

New requirement change is: User should be allowed to select multiple log files but only one LFA file.

If I set MultiSelect to true, it will allow select multiple log and lfa files.

Please advise is there any way to implement this feature?

Answer 1

After your answer, if you don't want the UI of the file dialog to close and reopen, you can actually do it. Having your IsValidFileSelection, it should be a matter of doing:

dlgFileBrowse.FileOk += (s,e) => {
   var dlg = s as OpenFileDialog;
   if (dlg == null) return;
   if (!IsValidFileSelectiom(dlg.FileNames))
   {
      // Or whatever
      MessageBox.Show("Please select one log/lfa file or multiple log files.");
      e.Cancel = true;
   }         
};

Before calling OpenDialog()