如何使用mvc c＃导出到网格中显示的csv文件

Question

I have a grid with the following consist of file columns and header as its shown in the following :

   List<string> eventResult = (from c in DB.Events
                                    where (c.m_turbine_id == turbineid.turbineID) && (c.m_time_stamp >= frmDate && c.m_time_stamp <= toDate)

                                    select new EventLogPartialViewModel
                                    {
                                        Timestamp = c.m_time_stamp,
                                        Description = c.m_event_log_description,
                                        WindSpeed = c.m_wind_speed,
                                        RPM = c.m_rpm,
                                        Power = c.m_power
                                    }).ToList().Select(x =>
                  x.Timestamp.ToString("dd/MM/yyyy H:mm:ss") + "," +
                  x.Description + "," +
                  x.WindSpeed + "," +
                  x.RPM + "," +
                  x.Power)

             .ToList();

Im using the following conversion to get CSV file:

 string sss=string.Join(",",eventResult.ToArray());         
 byte[] csvBytes = ASCIIEncoding.ASCII.GetBytes(sss);

here I export:

 return this.File(csvBytes, "text/csv",".csv");

when I open the file, headers are missing and all my data is in a single line,not like a grid

Answer 1

You've already joined fields by comma in your last select statement, so final Join should be by new line.

string sss = string.Join(Environment.NewLine, eventResult.ToArray());

Typically I use CsvHelper for generating csv files, since I don't want to validate or escape double quotation marks and commas in my input string. These are quite common characters that can disrupt the file.

For including a header full code is:

string header = "Timestamp,Description,WindSpeed,RPM,Power";
string rows = string.Join(Environment.NewLine, eventResult.ToArray());
byte[] csvBytes = ASCIIEncoding.ASCII.GetBytes(header + Environment.NewLine + rows);
return File(csvBytes, "text/csv", ".csv");