问如何调用Ubuntu系统打开或保存像Windows这样的文件对话框

EN

Gtk.FileChooserDialog Class

public class MainWindow: Gtk.Window {

    protected virtual void OnBtnLoadFileClicked(object sender, System.EventArgs e)
    {
        Gtk.FileChooserDialog fc=
        new Gtk.FileChooserDialog("Choose the file to open",
                                    this,
                                    FileChooserAction.Open,
                                    "Cancel",ResponseType.Cancel,
                                    "Open",ResponseType.Accept);

        if (fc.Run() == (int)ResponseType.Accept) 
        {
            System.IO.FileStream file=System.IO.File.OpenRead(fc.Filename);
            file.Close();
        }
        //Don't forget to call Destroy() or the FileChooserDialog window won't get closed.
        fc.Destroy();
    }