using FastExcel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ExcelNet
{
    public class ExcelReader
    {

        public List<string> Get_ExcelSheets(string filename)

        {
            Worksheet sheet = new Worksheet();
            var inputFile = new FileInfo(filename);
            FastExcel.FastExcel fastExcel = new FastExcel.FastExcel(inputFile, true);
            var worksheets = new List<string>();
            for (int i = 0; i < fastExcel.Worksheets.Count(); i++)
            {
                worksheets.Add(fastExcel.Worksheets[i].Name);
            }
            return worksheets;

        }
        public void Excel_To_Datatabable(string filename, string sheet, bool includinheaders, ref System.Data.DataTable data)
        {
            Worksheet worksheet = null;
            data.Rows.Clear();
            data.Columns.Clear();


            var inputFile = new FileInfo(filename);

            using (FastExcel.FastExcel fastExcel = new FastExcel.FastExcel(inputFile, true))
            {
                // Read the rows using worksheet name
                // worksheet = fastExcel.Read(sheet);

                // Read the rows using the worksheet index
                // Worksheet indexes are start at 1 not 0
                // This method is slightly faster to find the underlying file (so slight you probably wouldn't notice)
                worksheet = fastExcel.Read(sheet);

                try
                {

                    var rows = worksheet.Rows.ToArray();
                    var cells = rows[0].Cells.ToArray();
                    if (includinheaders)
                    {
                        for (int j = 0; j < cells.Length; j++)
                        {
                            data.Columns.Add(cells[j].Value.ToString());
                        }
                    }
                    for (int i = 1; i < rows.Length; i++)
                    {
                        cells = rows[i].Cells.ToArray();

                        DataRow dr = data.NewRow();

                        for (int j = 0; j < cells.Length; j++)
                        {
                            dr[j] = cells[j].Value.ToString();
                        }
                        data.Rows.Add(dr);
                    }
                }
                catch { }
            }
        }
    }
}