private void EditExecute(object obj)
{
if (SelectedQuestion == null)
{
MessageBox.Show("请选择要编辑的问题");
return;
}
var c = new AskAndAnswer(SelectedQuestion.DeepCopy());
c.Closed += (s, e) =>
{
if (c.DialogResult == true)
{
Refresh();
}
};
c.Show();
}