using System;

using System.Collections.Generic;

using System.Text;

using System.Data;

using System.Data.OleDb;

using Microsoft.Office.Interop.Excel;

namespace OA_Batch

{

    public class ExcelHelper

    {

        /// <summary>

        ///  从excel2007文件中读出dt

        /// </summary>

        /// <param name="fileName"></param>

        /// <returns></returns>

        public System.Data.DataTable ExcelToDataTable(string fileName)

        {

            System.Data.DataTable dt;

            string conStr = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source="+fileName+";Extended Properties='Excel 12.0;HDR=YES;IMEX=1'";

            OleDbConnection myConn = new OleDbConnection(conStr);

            string strCom = " SELECT * FROM [Sheet1$]";

            myConn.Open();

            OleDbDataAdapter myCommand = new OleDbDataAdapter(strCom, myConn);

            dt = new System.Data.DataTable();

            myCommand.Fill(dt);

            myConn.Close();

            return dt;

        }

        public void DataTabletoExcel(System.Data.DataTable tmpDataTable, string strFileName)

        {

            if (tmpDataTable == null)

                return;

            int rowNum = tmpDataTable.Rows.Count;

            int columnNum = tmpDataTable.Columns.Count;

            int rowIndex = 1;

            int columnIndex = 0;

 

            Application xlApp = new ApplicationClass();

            xlApp.DefaultFilePath = "";

            xlApp.DisplayAlerts = true;

            xlApp.SheetsInNewWorkbook = 1;

            Workbook xlBook = xlApp.Workbooks.Add(true);

 

            //将DataTable的列名导入Excel表第一行

            foreach (DataColumn dc in tmpDataTable.Columns)

            {

                columnIndex++;

                xlApp.Cells[rowIndex, columnIndex] = dc.ColumnName;

            }

 

            //将DataTable中的数据导入Excel中

            for (int i = 0; i < rowNum; i++)

            {

                rowIndex++;

                columnIndex = 0;

                for (int j = 0; j < columnNum; j++)

                {

                    columnIndex++;

                    xlApp.Cells[rowIndex, columnIndex] = tmpDataTable.Rows[i][j].ToString();

                }

            }

            //xlBook.SaveCopyAs(HttpUtility.UrlDecode(strFileName, System.Text.Encoding.UTF8));

            xlBook.SaveCopyAs(strFileName);

            xlBook.Close(false);

        }

    }

}