using System;
using System.Collections;
using System.Collections.Generic;
using System.Data;
using System.Data.Odbc;
using System.Data.OleDb;
using System.Diagnostics;
using System.IO;
using System.Reflection;
using System.Text;
using NetLibrary.Data;
using NPOI.HSSF.UserModel;
using NPOI.HSSF.Util;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NetLibrary;

namespace TradeManageNew
{
    public class ExcelNew
    {
        #region 导入
        public DataTable ImportExcel(string fileName)
        {
            HSSFWorkbook hssfworkbook;
            using (FileStream file = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
            {
                hssfworkbook = new HSSFWorkbook(file);
            }
            ISheet sheet = hssfworkbook.GetSheetAt(0);
            IEnumerator rows = sheet.GetRowEnumerator();

            DataTable dt = new DataTable();
            IRow row;

            rows.MoveNext();
            row = (HSSFRow)rows.Current;
            int len = row.LastCellNum;
            int j = 0;
            for (int i = 0; i < len; i++)
            {
                ICell cell = row.GetCell(i);
                if (cell != null)
                {
                    if (cell.ToString().Trim() == "Tracking ID Charge Description")
                    {
                        dt.Columns.Add(cell.ToString().Trim()+j.ToString());

                    }
                    else if (cell.ToString().Trim() == "Tracking ID Charge Amount")
                    {
                        dt.Columns.Add(cell.ToString().Trim() + j.ToString());
                        j++;

                    }
                    else
                    {
                        if (dt.Columns.Contains(cell.ToString().Trim()) == true)
                            dt.Columns.Add(cell.ToString().Trim() + i.ToString());
                        else
                        dt.Columns.Add(cell.ToString().Trim());
                    }
                }
            }

            while (rows.MoveNext())
            {
                row = (HSSFRow)rows.Current;
                DataRow dr = dt.NewRow();

                for (int i = 0; i < len; i++)
                {
                    ICell cell = row.GetCell(i);
                    if (cell == null)
                    {
                        dr[i] = null;
                    }
                    else
                    {
                        //读取Excel格式，根据格式读取数据类型
                        switch (cell.CellType)
                        {
                            case CellType.BLANK: //空数据类型处理
                                dr[i] = "";
                                break;
                            case CellType.STRING: //字符串类型
                                dr[i] = cell.StringCellValue;
                                break;
                            case CellType.NUMERIC: //数字类型                                   
                                if (DateUtil.IsCellDateFormatted(cell))//日期类型
                                {
                                    dr[i] = cell.DateCellValue;
                                }
                                else//其他数字类型
                                {
                                    dr[i] = cell.NumericCellValue;
                                }

                                break;
                            case CellType.FORMULA:
                                HSSFFormulaEvaluator e = new HSSFFormulaEvaluator(hssfworkbook);
                                dr[i] = e.Evaluate(cell).StringValue;
                                break;
                            default:
                                dr[i] = "";
                                break;
                        }

                        //if (cell.CellType == CellType.FORMULA || cell.CellType == CellType.NUMERIC)
                        //{
                        //    dr[i] = cell.DateCellValue;
                        //}
                        //else
                        //{


                        //    dr[i] = cell.ToString().Trim();
                        //}
                    }
                }
                dt.Rows.Add(dr);
            }

            return dt;
        }
        #endregion
    }
}