如何在csv文件中存储已排序的记录？

Question

我使用TradingDate

类型的列datetime.对日期数据表的记录进行排序

TableWithOnlyFixedColumns.DefaultView.Sort = "TradingDate asc";

现在我想将这些已排序的记录存储到csv文件中，但存储的记录不按日期排序。

 TableWithOnlyFixedColumns.DefaultView.Sort = "TradingDate asc";
  DataTable newTable = TableWithOnlyFixedColumns.Clone();
  newTable.DefaultView.Sort = TableWithOnlyFixedColumns.DefaultView.Sort;
  foreach (DataRow oldRow in TableWithOnlyFixedColumns.Rows)
  {
     newTable.ImportRow(oldRow);
  }
  // we'll use these to check for rows with nulls
  var columns = newTable.DefaultView.Table.Columns.Cast<DataColumn>();
  using (var writer = new StreamWriter(@"C:\Documents and Settings\Administrator\Desktop\New.csv"))
  {
     for (int i = 0; i < newTable.DefaultView.Table.Rows.Count; i++)
     {
        DataRow row = newTable.DefaultView.Table.Rows[i];
        // check for any null cells
        if (columns.Any(column => row.IsNull(column)))
        continue;
       string[] textCells = row.ItemArray
      .Select(cell => cell.ToString()) // may need to pick a text qualifier here
      .ToArray();
      // check for non-null but EMPTY cells
      if (textCells.Any(text => string.IsNullOrEmpty(text)))
      continue;
      writer.WriteLine(string.Join(",", textCells));
    }
 }

那么如何在csv文件中存储已排序的记录？

Answer 1

这行代码;

DataRow row = newTable.DefaultView.Table.Rows[i]; 

引用DataView后面的未排序DataTable。您需要使用DataRowView而不是DataRow，并从DataView访问已排序的行;

DataRowView row = newTable.DefaultView[i];