如何知道用户关闭打开对话框而不保存？

Question

SaveFileDialog sfd = new SaveFileDialog();

sfd.ShowDialog();
sfd.Filter("Wave Files|*.wav");
ss.SetOutPutToWaveFile(sfd.FileName);
ss.Speak(richTextbox.Text);
ss.SetOutputToDefaultAudioDevice();

Answer 1

if (sfd.ShowDialog() == DialogResult.OK){

  //user  saved it
}
else {

   //write code to handle the case when an user does't save , and canceled it
}

Answer 2

使用checkbox.setFieldFlags(PDField.FLAG_READ_ONLY); 的返回值：

sfd.ShowDialog()