private void btnDelete_Click(object sender, System.Windows.RoutedEventArgs e) { bool res = false; var rest = MessageBox.Show("确定删除数据吗?", "警告", MessageBoxButton.YesNo, MessageBoxImage.Warning); if (rest == MessageBoxResult.Yes) { res = viewModel.DeleteHistoryData((DateTime)starttime.Value, (DateTime)endtime.Value); if (res) { MessageBox.Show("删除数据成功!", "提示", MessageBoxButton.OK, MessageBoxImage.Information); } else { MessageBox.Show("删除数据失败!", "提示", MessageBoxButton.OK, MessageBoxImage.Error); } } }