Question

I’m using the following code to convert an Excel to a datatable using EPPlus:

public DataTable ExcelToDataTable(string path)
{
    var pck = new OfficeOpenXml.ExcelPackage();
    pck.Load(File.OpenRead(path));
    var ws = pck.Workbook.Worksheets.First();
    DataTable tbl = new DataTable();
    bool hasHeader = true;
    foreach (var firstRowCell in ws.Cells[1, 1, 1, ws.Dimension.End.Column])
    {
        tbl.Columns.Add(hasHeader ? firstRowCell.Text : string.Format("Column {0}", firstRowCell.Start.Column));
    }
    var startRow = hasHeader ? 2 : 1;
    for (var rowNum = startRow; rowNum <= ws.Dimension.End.Row; rowNum++)
    {
        var wsRow = ws.Cells[rowNum, 1, rowNum, ws.Dimension.End.Column];
        var row = tbl.NewRow();
        foreach (var cell in wsRow)
        {
            row[cell.Start.Column - 1] = cell.Text;
        }
        tbl.Rows.Add(row);
    }
    pck.Dispose();
    return tbl;
}

It creates the Excel, however, when I try to open it, it gives me the message that it is locked for editing by another user and that I can only open it in Read-Only mode.

I thought using:

pck.Dispose();

would solve the issue, however I’m still getting the same error.

Also, when I try to delete the file, I get the message: The action can’t be completed because the file is open in WebDev.WebServer40.EXE.

Any ideas how to resolve this?
Thanks in advance. 🙂

Answer 1

I see, that’s what I’ve posted recently here (now corrected). It can be improved since the ExcelPackage and the FileStream (from File.OpenRead) are not disposed after using.

public static DataTable GetDataTableFromExcel(string path, bool hasHeader = true)
{
    using (var pck = new OfficeOpenXml.ExcelPackage())
    {
        using (var stream = File.OpenRead(path))
        {
            pck.Load(stream);
        }
        var ws = pck.Workbook.Worksheets.First();  
        DataTable tbl = new DataTable();
        foreach (var firstRowCell in ws.Cells[1, 1, 1, ws.Dimension.End.Column])
        {
            tbl.Columns.Add(hasHeader ? firstRowCell.Text : string.Format("Column {0}", firstRowCell.Start.Column));
        }
        var startRow = hasHeader ? 2 : 1;
        for (int rowNum = startRow; rowNum <= ws.Dimension.End.Row; rowNum++)
        {
            var wsRow = ws.Cells[rowNum, 1, rowNum, ws.Dimension.End.Column];
            DataRow row = tbl.Rows.Add();
            foreach (var cell in wsRow)
            {
                row[cell.Start.Column - 1] = cell.Text;
            }
        }
        return tbl;
    }
}