Crash for SaveFileDialog when using root directory

[zappu9x]

• Bug crash of VistaFolderBrowserDialog when using root directory path (same for VistaSaveFileDialog when directory is "L:\" (not exist) and default file name is empty)

[augustoproiete]

Hi @zappu9x, thanks for reporting this and for taking the time to submit PR #10.

Could you please add here the steps to reproduce this crash, screenshot, error message (if any), as well more details of your environment (OS, .NET version, NuGet package version, etc.)?

I tested VistaFolderBrowserDialog, VistaSaveFileDialog , and VistaOpenFileDialog, by setting the initial directory to C:\ (also tested C:) and default file name to empty (and null), and didn't see any crash.

Tested on Windows 10, .NET 4.8, latest commit from master as of this writing.

[zappu9x]

Hi @augustoproiete, thanks for reviewing my PR #10.

Sorry, my response didn't clearly!

You had published 2 libraries ookii-dialogs-wpf and ookii-dialogs-winforms. Thank you very much for your libraries. I think it is same, and i got some issues on ookii-dialogs-winforms so i want to PR both to fix them!

There 2 points i want to update on the PR:

1. I got different result when using 2 options VistaSaveFileDialog and System.Windows.Forms.SaveFileDialog

• Option1:

var saveFileDialog = new VistaSaveFileDialog();

• Option2:

//forceDownLevel using System.Windows.Forms.SaveFileDialog
var saveFileDialog = new VistaSaveFileDialog(true); 
//or saveFileDialog = new SaveFileDialog()

And using the same following code

saveFileDialog.FileName= @"E:\OneDrive";
saveFileDialog.InitialDirectory = @"D:\NewFolder";

Result:

• System.Windows.Forms.SaveFileDialog: FileName is E:\OneDrive.txt, Folder is D:\NewFolder
• VistaSaveFileDialog: FileName is OneDrive.txt, Folder is E:\
  I think the should be consistency, and result should be same

2. I got crash if using VistaSaveFileDialog but not with System.Windows.Forms.SaveFileDialog
   Try to pass not an existing directory like @"L:\" or @"E:\OneDrivexxxx"

var saveFileDialog = new VistaSaveFileDialog();
saveFileDialog.InitialDirectory = @"E:\OneDrivexxxx"; //OneDrivexxxx is not exist directory

They will crash!
The below code have a problem when you didn't check exist directory for variable parent!

string folder = Path.GetFileName(_fileNames[0]);
dialog.SetFolder(NativeMethods.CreateItemFromParsingName(parent));
dialog.SetFileName(folder);

Please review this, and if have any question please send to me!