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using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;

namespace Woo.Utility
{
    /// <summary>
    /// 使用nopi導(dǎo)入excel到數(shù)據(jù)庫
    /// </summary>
    public class NopiExcelImportHiper
    {

        private string fileName = null; //文件名
        private IWorkbook workbook = null;
        private FileStream fs = null;
        private bool disposed;

        /// <summary>
        /// 構(gòu)造函數(shù)
        /// </summary>
        /// <param name="fileName"></param>
        public NopiExcelImportHiper(string fileName)
        {
            this.fileName = fileName;
            disposed = false;
        }

        #region Excel導(dǎo)入dataTable

        /// <summary>
        /// 將excel中的數(shù)據(jù)導(dǎo)入到DataTable中
        /// </summary>
        /// <param name="sheetName">excel工作薄sheet的名稱</param>
        /// <param name="isFirstRowColumn">第一行是否是DataTable的列名</param>
        /// <returns>返回的DataTable</returns>
        public DataTable ExcelToDataTable(string sheetName, bool isFirstRowColumn)
        {
            ISheet sheet = null;
            DataTable data = new DataTable();
            int startRow = 0;
            try
            {
                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                    workbook = new XSSFWorkbook(fs);
                else if (fileName.IndexOf(".xls") > 0) // 2003版本
                    workbook = new HSSFWorkbook(fs);

                if (sheetName != null)
                {
                    sheet = workbook.GetSheet(sheetName);
                    if (sheet == null) //如果沒有找到指定的sheetName對(duì)應(yīng)的sheet，則嘗試獲取第一個(gè)sheet
                    {
                        sheet = workbook.GetSheetAt(0);
                    }
                }
                else
                {
                    sheet = workbook.GetSheetAt(0);
                }
                if (sheet != null)
                {
                    IRow firstRow = sheet.GetRow(0);
                    int cellCount = firstRow.LastCellNum; //一行最后一個(gè)cell的編號(hào) 即總的列數(shù)

                    if (isFirstRowColumn)
                    {
                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                        {
                            ICell cell = firstRow.GetCell(i);
                            if (cell != null)
                            {
                                string cellValue = cell.StringCellValue;
                                if (cellValue != null)
                                {
                                    DataColumn column = new DataColumn(cellValue);
                                    data.Columns.Add(column);
                                }
                            }
                        }
                        startRow = sheet.FirstRowNum + 1;
                    }
                    else
                    {
                        startRow = sheet.FirstRowNum;
                    }

                    //最后一列的標(biāo)號(hào)
                    int rowCount = sheet.LastRowNum;
                    for (int i = startRow; i <= rowCount; ++i)
                    {
                        IRow row = sheet.GetRow(i);
                        if (row == null) continue; //沒有數(shù)據(jù)的行默認(rèn)是null　　　　　　　
                       
                        DataRow dataRow = data.NewRow();
                        for (int j = row.FirstCellNum; j < cellCount; ++j)
                        {
                            if (row.GetCell(j) != null) //同理，沒有數(shù)據(jù)的單元格都默認(rèn)是null
                                dataRow[j] = row.GetCell(j).ToString();
                        }
                        data.Rows.Add(dataRow);
                    }
                }

                return data;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception: " + ex.Message);
                return null;
            }
        }

        #endregion

        #region DataTable導(dǎo)入到excel
        /// <summary>
        /// 將DataTable數(shù)據(jù)導(dǎo)入到excel中
        /// </summary>
        /// <param name="data">要導(dǎo)入的數(shù)據(jù)</param>
        /// <param name="isColumnWritten">DataTable的列名是否要導(dǎo)入</param>
        /// <param name="sheetName">要導(dǎo)入的excel的sheet的名稱</param>
        /// <returns>導(dǎo)入數(shù)據(jù)行數(shù)(包含列名那一行)</returns>
        public string DataTableToExcel(DataTable data, string sheetName, bool isColumnWritten)
        {
            int i = 0;
            int j = 0;
            int count = 0;
            ISheet sheet = null;

            fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            if (fileName.IndexOf(".xlsx") > 0) // 2007版本
                workbook = new XSSFWorkbook();
            else if (fileName.IndexOf(".xls") > 0) // 2003版本
                workbook = new HSSFWorkbook();

            try
            {
                if (workbook != null)
                {
                    sheet = workbook.CreateSheet(sheetName);
                }
                else
                {
                    return string.Empty;
                }

                if (isColumnWritten == true) //寫入DataTable的列名
                {
                    IRow row = sheet.CreateRow(0);
                    for (j = 0; j < data.Columns.Count; ++j)
                    {
                        row.CreateCell(j).SetCellValue(data.Columns[j].ColumnName);
                    }
                    count = 1;
                }
                else
                {
                    count = 0;
                }

                for (i = 0; i < data.Rows.Count; ++i)
                {
                    IRow row = sheet.CreateRow(count);
                    for (j = 0; j < data.Columns.Count; ++j)
                    {
                        row.CreateCell(j).SetCellValue(data.Rows[i][j].ToString());
                    }
                    ++count;
                }
                workbook.Write(fs); //寫入到excel
                fs.Close();
                return fs.Name;
            }
            catch (Exception ex)
            {
                Console.WriteLine("Exception: " + ex.Message);
                return string.Empty;
            }
        }

    #endregion

        /// <summary>
        /// 釋放資源
        /// </summary>
        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }
        /// <summary>
        /// 釋放資源
        /// </summary>
        /// <param name="disposing"></param>
        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    if (fs != null)
                        fs.Close();
                }

                fs = null;
                disposed = true;
            }
        }
   

    }
}