EPPlus - Read Excel Table

Question

Using EPPlus, I want to read an excel table, then store all the contents from each column into its corresponding List. I want it to recognize the table\'s headi

Answer 1

I have got an error on the first answer so I have changed some code line.

Please try my new code, it's working for me.

using OfficeOpenXml;
using OfficeOpenXml.Table;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;

public static class ImportExcelReader
{
    public static List ImportExcelToList(this ExcelWorksheet worksheet) where T : new()
    {
        //DateTime Conversion
        Func convertDateTime = new Func(excelDate =>
        {
            if (excelDate < 1)
            {
                throw new ArgumentException("Excel dates cannot be smaller than 0.");
            }

            DateTime dateOfReference = new DateTime(1900, 1, 1);

            if (excelDate > 60d)
            {
                excelDate = excelDate - 2;
            }
            else
            {
                excelDate = excelDate - 1;
            }

            return dateOfReference.AddDays(excelDate);
        });

        ExcelTable table = null;

        if (worksheet.Tables.Any())
        {
            table = worksheet.Tables.FirstOrDefault();
        }
        else
        {
            table = worksheet.Tables.Add(worksheet.Dimension, "tbl" + ShortGuid.NewGuid().ToString());

            ExcelAddressBase newaddy = new ExcelAddressBase(table.Address.Start.Row, table.Address.Start.Column, table.Address.End.Row + 1, table.Address.End.Column);

            //Edit the raw XML by searching for all references to the old address
            table.TableXml.InnerXml = table.TableXml.InnerXml.Replace(table.Address.ToString(), newaddy.ToString());
        }

        //Get the cells based on the table address
        List> groups = table.WorkSheet.Cells[table.Address.Start.Row, table.Address.Start.Column, table.Address.End.Row, table.Address.End.Column]
            .GroupBy(cell => cell.Start.Row)
            .ToList();

        //Assume the second row represents column data types (big assumption!)
        List types = groups.Skip(1).FirstOrDefault().Select(rcell => rcell.Value.GetType()).ToList();

        //Get the properties of T
        List modelProperties = new T().GetType().GetProperties().ToList();

        //Assume first row has the column names
        var colnames = groups.FirstOrDefault()
            .Select((hcell, idx) => new
            {
                Name = hcell.Value.ToString(),
                index = idx
            })
            .Where(o => modelProperties.Select(p => p.Name).Contains(o.Name))
            .ToList();

        //Everything after the header is data
        List> rowvalues = groups
            .Skip(1) //Exclude header
            .Select(cg => cg.Select(c => c.Value).ToList()).ToList();

        //Create the collection container
        List collection = new List();
        foreach (List