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c# – ExcelDataReader.AsDataSet not working

Posted by: admin March 9, 2020 Leave a comment


I’m using ExcelDataReader v.2.1. library to read both xls and xlsx files in my C# project. This way:

FileStream stream = File.Open(filePath, FileMode.Open, FileAccess.Read);
IExcelDataReader excelReader;

string extension = Path.GetExtension(filePath);

if (extension == ".xls")
    excelReader = ExcelReaderFactory.CreateBinaryReader(stream);
else if (extension == ".xlsx")
    excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream);
    throw new NotSupportedException("Wrong file extension");

return excelReader;

Then, I use “AsDataSet” method to get a filled DataSet:

_dataSet = GetDataReader(_options.Filepath).AsDataSet();

It works fine most of the times, but, with some XLSX files, it only reads the first column.
I’ve been looking at excelReader instance with a Watch and I saw that it actually gets all the values of the Excel, but then, when using the AsDataSet method, it only reads the first column.

Do you know what can be going wrong here? Do you think it could be a “AsDataSet” method bug?

How to&Answers:

install ExcelDataReader.DataSet via nugget