//搜索按钮 private void QueryBtn_Click(object sender, RoutedEventArgs e) { Time1.SelectedDateFormat = DatePickerFormat.Short; Time2.SelectedDateFormat = DatePickerFormat.Short; string time1 = Time1.SelectedDate.ToString(); string time2 = Time2.SelectedDate.ToString(); List <Activity> activities = dbUtill.QueryActivities(Keyword.Text, time1, time2); if (activities.Count > 0) { activity_panel.ItemsSource = activities; } else { MessageBox.Show("暂未找到匹配的记录", "提示"); } }