Csharp: read excel file using Open XML SDK 2.5

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Xml;
using DocumentFormat.OpenXml;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Wordprocessing;
using DocumentFormat.OpenXml.Spreadsheet;

namespace OpenXmlOficeDemo
{

    /// <summary>
    /// Open XML SDK 2.0 for Microsoft Office http://www.microsoft.com/en-us/download/details.aspx?id=5124
    /// Open XML SDK 2.5 for Microsoft Office http://www.microsoft.com/en-us/download/details.aspx?id=30425
    /// Open XML SDK open source  https://github.com/officedev/open-xml-sdk
    /// Open XML SDK 2.5 类库参考 https://msdn.microsoft.com/ZH-CN/library/gg278315.aspx
    /// http://openxmldeveloper.org/
    /// https://github.com/OfficeDev/Open-Xml-PowerTools
    /// https://msdn.microsoft.com/en-us/library/office/bb448854.aspx
    /// https://github.com/OfficeDev
    /// </summary>
    public partial class Form1 : Form
    {

        /// <summary>
        ///
        /// </summary>
        public Form1()
        {
            InitializeComponent();
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Form1_Load(object sender, EventArgs e)
        {

        }
        /// <summary>
        ///
        /// </summary>
        public class Package
        {
            public string Company { get; set; }
            public double Weight { get; set; }
            public long TrackingNumber { get; set; }
            public DateTime DateOrder { get; set; }
            public bool HasCompleted { get; set; }
        }
        /// <summary>
        /// 生成EXCEL文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            string timeMark = DateTime.Now.ToString("yyyyMMddHHmmss");
            string excelPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "geovindu" + timeMark + ".xlsx");
            List<Package> packages =
                 new List<Package>
                        { new Package { Company = "Coho Vineyard", Weight = 25.2, TrackingNumber = 89453312L, DateOrder = DateTime.Today, HasCompleted = false },
                          new Package { Company = "Lucerne Publishing", Weight = 18.7, TrackingNumber = 89112755L, DateOrder = DateTime.Today, HasCompleted = false },
                          new Package { Company = "Wingtip Toys", Weight = 6.0, TrackingNumber = 299456122L, DateOrder = DateTime.Today, HasCompleted = false },
                          new Package { Company = "Adventure Works", Weight = 33.8, TrackingNumber = 4665518773L, DateOrder =  DateTime.Today.AddDays(-4), HasCompleted = true },
                          new Package { Company = "Test Works", Weight = 35.8, TrackingNumber = 4665518774L, DateOrder =  DateTime.Today.AddDays(-2), HasCompleted = true },
                          new Package { Company = "Good Works", Weight = 48.8, TrackingNumber = 4665518775L, DateOrder =  DateTime.Today.AddDays(-1), HasCompleted = true },

                        };

            List<string> headerNames = new List<string> { "Company", "Weight", "Tracking Number", "Date Order", "Completed" };
            ExcelFacade excelFacade = new ExcelFacade();
            excelFacade.Create<Package>(excelPath, packages, "Packages", headerNames);
        }

        /// <summary>
        /// 读取工作表
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button2_Click(object sender, EventArgs e)
        {

            string file = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Sample.xlsx");
            List<SheetNameInfo> sheets = new List<SheetNameInfo>();
            sheets = GetSheets(file);
            this.comboBox1.DataSource = sheets;
            comboBox1.DisplayMember = "SheetName";
            comboBox1.ValueMember = "SheetID";
            //1
            //OpenXmlOficeDemo.SLExcelUtility.SLExcelReader read = new SLExcelUtility.SLExcelReader();
            //var data = (new OpenXmlOficeDemo.SLExcelUtility.SLExcelReader()).ReadExcel(file);
            //this.dataGridView1.DataSource = data.DataRows;
            //2
            //FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);
            //DataTable dt = ReadAsDataTable(file);
            //this.dataGridView1.DataSource = dt;
           // fs.Close();
           // fs.Dispose();

        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            string file = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Desktop), "Sample.xlsx");
            //FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read, FileShare.Read);
            DataTable dt = ReadAsDataTable(file);// ReadExcel(this.comboBox1.SelectedText, fs);
            this.dataGridView1.DataSource = dt;
            //fs.Close();
            //fs.Dispose();
        }

        /// <summary>
        /// 读取工作表
        /// EXCEL 2007版以上
        /// </summary>
        /// <param name="strFileName"></param>
        /// <returns></returns>
        public static List<SheetNameInfo> GetSheets(String strFileName)
        {
            //  Fill this collection with a list of all the sheets.
            List<SheetNameInfo> sheets = new List<SheetNameInfo>();
            using (SpreadsheetDocument xlPackage = SpreadsheetDocument.Open(strFileName, false))
            {

                WorkbookPart workbook = xlPackage.WorkbookPart;
                Stream workbookstr = workbook.GetStream();
                XmlDocument doc = new XmlDocument();
                doc.Load(workbookstr);
                XmlNamespaceManager nsManager = new XmlNamespaceManager(doc.NameTable);
                nsManager.AddNamespace("default", doc.DocumentElement.NamespaceURI);
                XmlNodeList nodelist = doc.SelectNodes("//default:sheets/default:sheet", nsManager);
                int k = 0;
                foreach (XmlNode node in nodelist)
                {
                    SheetNameInfo sheetNameInfo = new SheetNameInfo();
                    String sheetName = String.Empty;
                    sheetName = node.Attributes["name"].Value;
                    sheetNameInfo.SheetID = k;
                    sheetNameInfo.SheetName = sheetName;
                    sheets.Add(sheetNameInfo);
                    k++;
                }
            }
            return sheets;
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="cell"></param>
        /// <param name="stringTablePart"></param>
        /// <returns></returns>
        public static String GetValue(Cell cell, SharedStringTablePart stringTablePart)
        {

            if (cell.ChildElements.Count == 0)
                return null;
            //get cell value
            String value = cell.CellValue.InnerText;
            //Look up real value from shared string table
            if ((cell.DataType != null) && (cell.DataType == CellValues.SharedString))
                value = stringTablePart.SharedStringTable
                .ChildElements[Int32.Parse(value)]
                .InnerText;
            return value;

        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="fileName"></param>
        /// <returns></returns>
        public static DataTable ReadAsDataTable(string fileName)
        {
            DataTable dataTable = new DataTable();
            using (SpreadsheetDocument spreadSheetDocument = SpreadsheetDocument.Open(fileName, false))
            {
                WorkbookPart workbookPart = spreadSheetDocument.WorkbookPart;
                IEnumerable<Sheet> sheets = spreadSheetDocument.WorkbookPart.Workbook.GetFirstChild<Sheets>().Elements<Sheet>();
                string relationshipId = sheets.First().Id.Value;
                WorksheetPart worksheetPart = (WorksheetPart)spreadSheetDocument.WorkbookPart.GetPartById(relationshipId);
                Worksheet workSheet = worksheetPart.Worksheet;
                SheetData sheetData = workSheet.GetFirstChild<SheetData>();
                IEnumerable<Row> rows = sheetData.Descendants<Row>();

                foreach (Cell cell in rows.ElementAt(0))
                {
                    dataTable.Columns.Add(GetCellValue(spreadSheetDocument, cell));
                }

                foreach (Row row in rows)
                {
                    DataRow dataRow = dataTable.NewRow();
                    for (int i = 0; i < row.Descendants<Cell>().Count(); i++)
                    {
                        dataRow[i] = GetCellValue(spreadSheetDocument, row.Descendants<Cell>().ElementAt(i));
                    }

                    dataTable.Rows.Add(dataRow);
                }

            }
            dataTable.Rows.RemoveAt(0);

            return dataTable;
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="document"></param>
        /// <param name="cell"></param>
        /// <returns></returns>
        private static string GetCellValue(SpreadsheetDocument document, Cell cell)
        {
            SharedStringTablePart stringTablePart = document.WorkbookPart.SharedStringTablePart;
            string value = cell.CellValue.InnerXml;

            if (cell.DataType != null && cell.DataType.Value == CellValues.SharedString)
            {
                return stringTablePart.SharedStringTable.ChildElements[Int32.Parse(value)].InnerText;
            }
            else
            {
                return value;
            }
        }