C# Linq 将表按照IP进行排序

/// <summary>
/// 将表按照IP进行排序
/// </summary>
/// <param name="dt">数据表</param>
/// <param name="columnName">字段</param>
/// <returns></returns>
public static DataTable LinqSortDataTable(DataTable dt, string columnName)
{
    DataView dv = dt.DefaultView;
    var query = (from item in dt.AsEnumerable()
                 orderby (Convert.ToInt32(item[columnName].ToString().Split('.')[0])),
                         (Convert.ToInt32(item[columnName].ToString().Split('.')[1])),
                         (Convert.ToInt32(item[columnName].ToString().Split('.')[2])),
                         (Convert.ToInt32(item[columnName].ToString().Split('.')[3]))
                 select item);
    dv = query.AsDataView();
    return dv.ToTable();
}