Setting the initial directory of an SaveFileDialog?

Question

I\'d like a SaveFileDialog with the following behavior:

• The first time you open it, it goes to \"My Documents\".

• Afterwards, it goes to the

Answer 1

The suggested workarounds didn't work for me, so after finding How does WPF OpenFileDialog track directory of last opened file? I implemented:

public static void SetInitialDirectory(this FileDialog dlg, string fileExtension, string initialDirectory)
        {
            // RestoreDirectory doesn't seem to be implemented - https://stackoverflow.com/questions/11144770/how-does-wpf-openfiledialog-track-directory-of-last-opened-file
            // so manually only set InitialDirectory if nothing is stored
            try
            {
                var mru = @"Software\Microsoft\Windows\CurrentVersion\Explorer\ComDlg32\OpenSavePidlMRU\" + fileExtension;
                var rk = Registry.CurrentUser.OpenSubKey(mru);
                if (rk == null)
                {
                    dlg.InitialDirectory = initialDirectory;
                }
            }
            catch (Exception)
            {
                // SecurityException, ObjectDisposedException => allow default behaviour
            }
        }

This will use the provided initialDirectory if the dialog has not been used before for this file extension. Once the dialog has been used, it reverts to the default behaviour of remembering the previous directory.