Question

尝试导出为CSV时，一切正常，但是，所有导出均缺少第一行。将同一记录导出到Excel或KML时，不会缺少此行。

试图重新编写函数并添加一行，但没有任何效果

public FileResult ExportToCSV()
    {
       List<Tuple<String, String>> nameValues = new    
       List<Tuple<string, string>>();
       if (ReportSession.FilterKeys != null)
    {
       nameValues = (List<Tuple<String, String>>)  
       ReportSession.FilterKeys;
    }


       ReportRequestFilter dbr = (ReportRequestFilter)     
       ReportSession.DatabaseRequestFilter;


    List<Report_Packet_History> dplist = GetAllReportData 
    (dbr.Group_Id, dbr.AllowChildgroups, dbr.Device_Id, dbr.user_id,  
    MapLimitConstants.MAX_EXPORT_BULK_ROWS, dbr.Lookback, dbr.periodEnd, 1, 
    dbr.ShowActiveOnly);
    List<Report_Packet_History> dplistreturn = GetFilters(nameValues,  
    dplist);


    //SetReportViewBags(dplist);

    DateTime endDate = dplist.Max(dt => dt.gps_datetime);
    DateTime startDate = dplist.Min(dt => dt.gps_datetime);
    String[] Device = dplist.Select(dt => dt.imei).Distinct().ToArray();
    String[] Group = dplist.Select(dt => dt.user_group_name).Distinct   
    ().ToArray();

    Utility.LocalisedDateTime ldt = ToolBox.ConvertToUserTimezone 
    (DateTime.UtcNow, Session.CurrentUserSettings.time_zone, false,  
    Session.CurrentUserSettings.Locale);


    String fileName = "IRISReport_" + string.Format("{0}_to_{1}",   
    startDate.ToShortDateString(), endDate.ToShortDateString());
    fileName += string.Format(Device.Count() > 1 ? "_Assets_" : "_Asset_"  
     +  
    Device[0]);
    fileName += string.Format(Group.Count() > 0 ? "_Groups_" : "_Group_"    
    +  Group[0]);


    //List<Report_Packet_History> dplistres = GetFilters(nameValues,  
    dplist).Take(MapLimitConstants.MAX_EXPORT_CSV_ROWS).Skip  
    (0).ToList<Report_Packet_History>();

    //Response.Charset = "";

    return GenerateCSV(dplistreturn, fileName + ".csv");

    }

这是GenerateCSV方法，标头在哪里设置为false？我有第一行= true。

private FileResult GenerateCSV(List<Report_Packet_History> report, String   
        FileName)
                {
                 Type rphType = typeof  
                 (Connector.Models.Report.Report_Packet_History);
                  PropertyInfo[] myField = 
                      rphType.GetProperties().ToArray();

                  Boolean firstRow = true;
                  StringBuilder csvOut = new StringBuilder();

                  MemoryTributary stream = new MemoryTributary();
                  foreach (Report_Packet_History rph in report)
                  {
                      for (int i = 0; i < myField.Length; i++)
                       {
                            if (firstRow)
                            {
                                csvOut.Append(myField[i].Name + ",");
                            }
                            else
                            {
                                if (myField[i].GetValue(rph) == null)
                                {
                                    csvOut. Append("" + ",");
                                }
                                else
                                {
                                    csvOut.Append(myField[i].GetValue  
                                    (rph).ToString() + ",");
                                 }
                              }
                         }
                         csvOut.Append("\r\n");
                         byte[] byteArray = Encoding.UTF8.GetBytes    
                                         (csvOut.ToString());
                         csvOut.Clear();

            stream.Write(byteArray, 0, byteArray.Length);
            firstRow = false;
        }

        stream.Seek(0, SeekOrigin.Begin);
        return File 
                  (stream,System.Net.Mime.MediaTypeNames.Application.Octet, 
                   FileName);
    }

Answer 1

第一行应该是“标题”行，我想您的GenerateCSV方法中的某处您已将标头设置为false。

Answer 2

您将忽略日期的第一行，而不是编写标题。

使用i开始循环时，该值为零。您的第一行标志也为true。第一次迭代将看到第一行标志并写入标头，然后重置该标志。没关系。但是，代码然后循环到下一个迭代，即第二行数据。

您需要先写出标题，然后开始循环遍历数据。

要全面改进，请查看File.WriteAllLines();）

使用C＃函数将缺少的第一条记录导出为CSV

2 个答案: