Excel Data Reader - Read Excel files in .NET

Created Unassigned: IndexOutOfRangeException - array for cell values too small [11881]

kleineswesen — Tue, 18 Jun 2013 14:43:35 GMT

I think the following line in method ExcelBinaryReader.readWorkSheetRow() is wrong:
```
m_cellsValues = new object[m_maxCol];
```
Reason:
m_maxCol holds the index of the last column, not the column count. We get a "one-off" here. Just fix the line like so:
```
m_cellsValues = new object[m_maxCol+1];
```

New Post: how to count row columns in excel

sholle — Mon, 17 Jun 2013 19:37:12 GMT

static void Main(string[] args)
{
  string _PathFilename = @"C:\Temp\tri_201918.xlsx";
  using (FileStream streamIn = File.Open(_PathFilename, FileMode.Open, FileAccess.Read))
  using (IExcelDataReader execlReader = (Path.GetExtension(_PathFilename) == ".xlsx" ? ExcelReaderFactory.CreateOpenXmlReader(streamIn):               ExcelReaderFactory.CreateBinaryReader(streamIn)))
  {
    DataSet ds = new DataSet();
    ds = execlReader.AsDataSet();

    int r = ds.Tables[0].Rows.Count;
    int c = ds.Tables[0].Columns.Count;

At this point, r has the number of rows and c has the number of columns in sheet 0.

New Post: how to count row columns in excel

nellaindri — Mon, 17 Jun 2013 17:24:30 GMT

i'm in progress to create an application in c# .
but i got a problem. i want to count how much column and row in excel file but i can't do this.
for example : i browse a file .xlsx. after this, i click OK and program can show number of columns and rows in this .xlsx.
anybody can help me?
thank you

Commented Unassigned: Poor performance when reading non indexed XLS file. [11827]

oleh_vasylyev — Sat, 15 Jun 2013 08:26:42 GMT

This is based on source code downloaded on 27th May 2013. I had a file with +100000 records in it and this file doesn't have index. So it took ~ 3 hours to complete reading that file. I debugged source code and found out that ExcelBinaryReader.moveToNextRecordNoIndex method skips all 100000 records (with ID = ROW) each time it reads 1 record! So perfomance degrades even worse when file size become bigger. According to my file's structure first come all blocks with ID = ROW and then all blocks with ID related to cell. I don't know whether this is correct structure for all files which do not have index. But I modified code and skipped all rows on sheet initialization and then just reading cells it took 40 seconds to complete large file.
Comments: ** Comment from web user: oleh_vasylyev **

OK, I will submit patch in the next week.

Patch Uploaded: #14667

oleh_vasylyev — Fri, 14 Jun 2013 09:54:23 GMT

oleh_vasylyev has uploaded a patch.

Description:
This is an enhancement which adds ability to get data starting from defined row and column and getting the rest of the data.

Commented Unassigned: Poor performance when reading non indexed XLS file. [11827]

Ian1971 — Fri, 14 Jun 2013 08:27:42 GMT

That sounds like a bug. Can you post the the fix you made?

Commented Unassigned: Can't capture empty sheet [11864]

Ian1971 — Fri, 14 Jun 2013 08:19:30 GMT

I hava an excel file, and in Sheet1 there some data, Sheet2 and Sheet3 by default they are empty. I read data by ExcelReaderFactory.CreateOpenXmlReader(stream).AsDataSet(), Sheet1's data is correct, but Only one DataTable int the returned dataset, I even can't get Sheet2 and Sheet3's name.
How can I do it correctly?

Thank you all.
Comments: ** Comment from web user: Ian1971 **

Does use the IDataReader interface and GetNextResult help?

New Post: object reference not set to an instance of an object

Ian1971 — Fri, 14 Jun 2013 08:17:00 GMT

Can you post the full stack trace?

New Post: reader.AsDataSet() throws an OutOfMemory exception with even not very big excel files (30 meg)

Ian1971 — Fri, 14 Jun 2013 08:14:33 GMT

something like this

while (excelReader.Read())
{
    var field0 = excelReader.GetInt32(0);  //where 0 is the column index. The column index can also be looked up from the name, but it is quicker to do it straight from the ordinal if you are sure the ordering isn't going to change
}

Most features of IDataReader are supported
http://msdn.microsoft.com/en-us/library/system.data.idatareader.aspx

Reopened Issue: Incorrect detection of the last row for certain BIFF8 files [10121]

Ian1971 — Fri, 14 Jun 2013 07:34:03 GMT

I'm dealing with BIFF8 documents generated by some proprietary accounting application (which is ubiqutous in Russia) and it seems in these documents the "last existing row" field from the "worksheet index" record is bogus and is less than the (correct) number available via the "dimensions" worksheet record.

While this can be viewed as the mentioned program violating "the specification", native Microsoft software and OpenOffice/LibreOffice have no problem dealing with these files so I'm inclined to think we should use the max available row number from that "dimensions" sheet record if it's available.

The attached patch contains the proposed fix.

Reopened Issue: the Last column not read [11433]

Ian1971 — Fri, 14 Jun 2013 07:34:03 GMT

New Post: object reference not set to an instance of an object

raghavainnocent — Fri, 14 Jun 2013 07:32:07 GMT

Hi Ryan and Steve,

Thanks for the reply.

Actually my excel sheet is having the data in it and even it is throwing the same exception.

Thanks for the help

New Post: object reference not set to an instance of an object

SteveHolle — Thu, 13 Jun 2013 16:31:10 GMT

You might want to try the equivalent of:

        foreach (DataTable sheet in ds.Tables)
        {

And see what tables you get or if you still get errors.

New Post: object reference not set to an instance of an object

RyanONeill1970 — Thu, 13 Jun 2013 16:20:40 GMT

excelReader looks good because it has a property set on the line before, that only leaves .Tables(0) as the candidate for null.

Can you check
Tables isnot nothing
and also
tables.count

Then go through the tables returned and check if each element is not null.

Can't see without a sample document really, but it might be that the first set of tables or sheet is just missing.

New Post: object reference not set to an instance of an object

raghavainnocent — Thu, 13 Jun 2013 15:45:15 GMT

Hello I have following bit of code used with the excel/csv sheets to import. I am using code plex excel dll for this purpose.

        Dim _stream As FileStream = File.Open(Server.MapPath("~/admin/DBDesigner/tempImportFolder/" & Fname),                            FileMode.Open, FileAccess.Read, FileShare.ReadWrite)
      Dim excelReader As IExcelDataReader = ExcelReaderFactory.CreateBinaryReader(_stream)
      excelReader.IsFirstRowAsColumnNames = FirstRowCols
      Dim dtTemp As DataTable = excelReader.AsDataSet().Tables(0)

When the control is coming to last line of the code it is throwing the exception

-->object reference not set to an instance of an object

Please help me out

Thanks in advance

New Post: reader.AsDataSet() throws an OutOfMemory exception with even not very big excel files (30 meg)

rfrancis — Tue, 11 Jun 2013 20:35:28 GMT

Could you give me an example of how I use IDataReader with the IExcelReaderDataReader. I have a rather large excel file of about 15,000 rows and would love to know how to use the IDataReader. My previous code used the dataset method to grab the data, but I think I may need to use the IDataReader since its a large amount of data. An example of how to do this would be great! Thanks.

New Post: Google Docs XLSX IndexOutOfRangeException

RyanONeill1970 — Tue, 11 Jun 2013 18:01:17 GMT

I've not heard of it before. With the complexity and ambiguity of these specifications I'd imagine Google are doing the right thing and there is something subtle different.

So any test cases you can muster would be very handy.

New Post: Google Docs XLSX IndexOutOfRangeException

jordannb — Tue, 11 Jun 2013 14:56:13 GMT

public ActionResult Index()
        {
            List<AirportModel> airports = new List<AirportModel>();
            var dataTable = new DataTable();
            FileStream stream = System.IO.File.Open("C:/Users/jordan.bostrom/Documents/goog.xlsx", FileMode.Open, FileAccess.Read);
            using (IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream))
            {          
                excelReader.IsFirstRowAsColumnNames = true;
                DataSet result = excelReader.AsDataSet();

                dataTable = result.Tables[0];
            }                      

                        
            using (SqlConnection connSql = new SqlConnection(ConfigurationManager.ConnectionStrings["Testing"].ConnectionString))
            {
                connSql.Open();
                using (SqlCommand cmdSql = new SqlCommand("[dbo].[Do_Stuff]", connSql))
                {
                    cmdSql.CommandType = CommandType.StoredProcedure;
                    cmdSql.Parameters.AddWithValue("@TableInput", dataTable);
                    using (SqlDataReader reader = cmdSql.ExecuteReader())
                    {
                        while (reader.Read())
                        {
                            AirportModel airport = new AirportModel();
                            airport.IATA = reader.GetString(0);
                            airport.AirportName = reader.GetString(1);
                            airport.AirportCity = reader.GetString(2);
                            airport.Country = reader.GetString(3);
                            airports.Add(airport);
                        }
                    }
                }
                
            }
            return View(airports);
        }

XLS and XLSX files from MS Office and LibreOffice are being read perfectly using this method, but the Google Docs format fails for some reason. I'm looking into the issue and will report back if I find anything. Is this a known issue? The error says that no table (dataTable = result.Tables[0];) has been found.

Commented Unassigned: Can't capture empty sheet [11864]

dearymz — Sun, 09 Jun 2013 10:21:42 GMT

Yes, this is a side point really.
But Excel Data Reader's view is different from an Excel'view, that if I use more than one difference excel SDKs, only Excel Data Reader is special.
This issue is not hugrry, if it is easy to implement, better.
Thanks SteveHolle.

New Post: reader.AsDataSet() throws an OutOfMemory exception with even not very big excel files (30 meg)

taralex — Sat, 08 Jun 2013 13:44:06 GMT

The problem was in the excel file, even though it only contained 19k rows, the reader was reading 1.6 Mil rows from it. All other readers also detected that the file had 1.6 mil rows...

Sent from my iPad