private void trans_btn_Click(object sender, RoutedEventArgs e) { if (textBeforeTrans.Text == "" || textBeforeTrans.Text == null) { return; } List <string> result = TranslateService.GetResult(textBeforeTrans.Text, languageBeforeTrans.Text, languageAfterTrans.Text); if (result == null) { return; } BaiduResult.Text = result[0]; YoudaoResult.Text = result[1]; TengxunResult.Text = result[2]; }