C#数据处理逻辑帮助

DataTable output = new DataTable();

using (var e = dataTable.AsEnumerable().GetEnumerator())
{
    if (!e.MoveNext())
        // No data in the datatable at all
        return;

    // Get first row
    var dt = (DateTime) e.Current["AccessDateTime"];
    var row = ((Direction) e.Current["Direction"] == Direction.In)
        ? new { Date = dt.Date, InTime = (TimeSpan?) dt.TimeOfDay, OutTime = (TimeSpan?) null }
        : new { Date = dt.Date, InTime = (TimeSpan?) null, OutTime = (TimeSpan?) dt.TimeOfDay };
    DataRow newRow;

    // Look at all the other rows
    while (e.MoveNext())
    {
        dt = (DateTime) e.Current["AccessDateTime"];
        if ((Direction) e.Current["Direction"] == Direction.Out && row.OutTime == null)
        {
            row = new { Date = row.Date, InTime = row.InTime, OutTime = (TimeSpan?) dt.TimeOfDay };
            continue;
        }

        newRow = output.NewRow();
        newRow["Date"] = row.Date;
        newRow["InTime"] = row.InTime;
        newRow["OutTime"] = row.OutTime;
        row = new { Date = dt.Date, InTime = (TimeSpan?) dt.TimeOfDay, OutTime = (TimeSpan?) null };
    }

    newRow = output.NewRow();
    newRow["Date"] = row.Date;
    newRow["InTime"] = row.InTime;
    newRow["OutTime"] = row.OutTime;
}