Question

My question is very simillar to the one asked here: Reading Excel files from C#

My question is whether there is a new better way of doing this now (2 years later), if not does anybody have some examples of using the ACE OLEDB 12.0 witch seem to be the best way to go with it?

What I need to do is an application that reads an xlsx file every night, wrap the data in the excel sheet, and then save it to the database, any other tips?

Thanks

Answer 1

Using ExcelPackage you can iterate all sheets and columns like this:

public class ExcelRead
{
    public void ReadExcel()
    {
        FileInfo existingFile = new FileInfo(@"C:\temp\book1.xlsx");
        using (ExcelPackage xlPackage = new ExcelPackage(existingFile))
        {
            foreach (ExcelWorksheet worksheet in xlPackage.Workbook.Worksheets)
            {
                var dimension = worksheet.Dimension();
                for (int row = dimension.StartRow; row <= dimension.EndRow; row++)
                {
                    for (int col = dimension.StartColumn; col <= dimension.EndColumn; col++)
                    {
                        Console.WriteLine(row + ":" + col + " - " + worksheet.Cell(row, col));
                    }
                }
            }
        }
    }
}

public class Dimension
{
    public int StartRow { get; set; }
    public int StartColumn { get; set; }
    public int EndRow { get; set; }
    public int EndColumn { get; set; }
}

public static class ExcelHelper
{
    private static readonly char[] _numbers = new[] {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'};

    public static Dimension Dimension(this ExcelWorksheet worksheet)
    {
        string range =
            worksheet.WorksheetXml.SelectSingleNode("//*[local-name()='dimension']").Attributes["ref"].Value;
        string[] rangeCoordinates = range.Split(':');

        int idx = rangeCoordinates[0].IndexOfAny(_numbers);
        int startRow = int.Parse(rangeCoordinates[0].Substring(idx));
        int startCol = ConvertFromExcelColumnName(rangeCoordinates[0].Substring(0, idx));

        if (rangeCoordinates.Length == 1)
            return new Dimension
                       {StartRow = startRow, StartColumn = startCol, EndRow = startRow, EndColumn = startCol};

        idx = rangeCoordinates[1].IndexOfAny(_numbers);
        int endRow = int.Parse(rangeCoordinates[1].Substring(idx));
        int endCol = ConvertFromExcelColumnName(rangeCoordinates[1].Substring(0, idx));
        return new Dimension {StartRow = startRow, StartColumn = startCol, EndRow = endRow, EndColumn = endCol};
    }

    public static int ConvertFromExcelColumnName(string name)
    {
        name = name.ToUpper();
        int result = 0;
        for (int i = 0; i < name.Length - 1; i++)
        {
            int val = name[i] - 64;
            int columnVal = (int) Math.Pow(26, name.Length - i - 1);
            result += val*columnVal;
        }
        result += name[name.Length - 1] - 64;
        return result;
    }
}