private void btnSave_Click(object sender, System.Windows.RoutedEventArgs e)
 {
     try
     {
         Microsoft.Win32.SaveFileDialog dlg = new Microsoft.Win32.SaveFileDialog();
         dlg.Filter   = "csv files(*.csv)|*.csv";
         dlg.FileName = System.DateTime.Now.ToString("yyyyMMddHHmmss") + ".csv";
         //dlg.InitialDirectory = "D:\\";
         dlg.AddExtension     = false;
         dlg.RestoreDirectory = true;
         System.Nullable <bool> result = dlg.ShowDialog();
         if (result == true)
         {
             string desFilePath = dlg.FileName.ToString();
             if (File.Exists(desFilePath))
             {
                 File.Delete(desFilePath);
             }
             CSVFileHelper.SaveRecordDataCSV(m_ListRecordsInfo, desFilePath);
             MessageBox.Show("备份数据保存成功!");
         }
     }
     catch (System.Exception ex)
     {
         MessageBox.Show(ex.Message);
     }
 }