StonehearthEditor.FolderSelectDialog.ShowDialog C# (CSharp) Method

        public DialogResult ShowDialog(IWin32Window owner)
        {
            IntPtr hwndOwner = owner != null ? owner.Handle : GetActiveWindow();

            IFileOpenDialog dialog = (IFileOpenDialog)new FileOpenDialog();
            try
            {
                IShellItem item;
                if (!string.IsNullOrEmpty(DirectoryPath))
                {
                    IntPtr idl;
                    uint atts = 0;
                    if (SHILCreateFromPath(DirectoryPath, out idl, ref atts) == 0)
                    {
                        if (SHCreateShellItem(IntPtr.Zero, IntPtr.Zero, idl, out item) == 0)
                        {
                            dialog.SetFolder(item);
                        }
                    }
                }

                dialog.SetOptions(FOS.FOS_PICKFOLDERS | FOS.FOS_FORCEFILESYSTEM);

                if (!string.IsNullOrEmpty(this.Title))
                    dialog.SetTitle(this.Title);

                uint hr = dialog.Show(hwndOwner);
                if (hr == ERROR_CANCELLED)
                    return DialogResult.Cancel;

                if (hr != 0)
                    return DialogResult.Abort;

                dialog.GetResult(out item);
                string path;
                item.GetDisplayName(SIGDN.SIGDN_FILESYSPATH, out path);
                DirectoryPath = path;
                return DialogResult.OK;
            }
            finally
            {
                Marshal.ReleaseComObject(dialog);
            }
        }

        private void chooseModDirectory()
        {
            var dialog = new FolderSelectDialog()
            {
                DirectoryPath = kModsDirectoryPath ?? Environment.CurrentDirectory,
                Title         = "Stonehearth Mods Root Directory"
            };

            DialogResult result = DialogResult.Abort;

            do
            {
                result = dialog.ShowDialog();

                if (result == DialogResult.OK)
                {
                    string newPath = dialog.DirectoryPath;

                    if (this.checkModsFolder(ref newPath))
                    {
                        kModsDirectoryPath = JsonHelper.NormalizeSystemPath(newPath);
                        Properties.Settings.Default["ModsDirectory"] = kModsDirectoryPath;
                        Properties.Settings.Default.Save();
                        return;
                    }
                    else if (Directory.Exists(newPath))
                    {
                        // If the directory does exist, but doesn't seem to be valid, make it a user chocie
                        if (MessageBox.Show("The chosen directory does not appear to be a valid mods directory. Choose it anyway?", "Possibly invalid mods directory", MessageBoxButtons.YesNo, MessageBoxIcon.Exclamation) == DialogResult.Yes)
                        {
                            return;
                        }
                    }
                    else
                    {
                        if (MessageBox.Show("Invalid mods directory chosen. Try again?", "Invalid directory", MessageBoxButtons.YesNo, MessageBoxIcon.Error) == DialogResult.No)
                        {
                            return;
                        }
                    }
                }
                else
                {
                    if (MessageBox.Show("No mods directory selected. Try again?", "No directory selected.", MessageBoxButtons.YesNo, MessageBoxIcon.Warning) == DialogResult.No)
                    {
                        return;
                    }
                }
            }while (true); // repeat until we've got a proper directory or the user aborts
        }