private void _query_Click(object sender, RoutedEventArgs e) { string device_id = _device_id.Text; System.Data.DataTable table = operationContract.ExecuteProQueryDevice(PubClass.userInfo.ID, _device_id.Text, dept_type); lvlist.DataContext = table; exporttable = table; _sj.Visibility = Visibility.Visible; _hj.Visibility = Visibility.Visible; _title.Text = table.Rows.Count.ToString(); if (table.Rows.Count == 0) { Toolkit.MessageBox.Show("没有查询到数据!", "系统提示", MessageBoxButton.OK, MessageBoxImage.Information); return; } }