C# 连接 读取 Excel

using System;

using System.IO;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Data;

using System.Data.OleDb;

using System.Windows;

using System.Windows.Forms;

namespace MyProjectDAL

{

    public class ExcelDB

    {

        private OleDbConnection connection, connWithoutHDR;

        private string connectionString, connStringWithoutHDR;

        //构造函数

        public ExcelDB(string strExcelFileName)

        {

            string path = Application.ExecutablePath;

            FileInfo exeInfo = new FileInfo(path);

            path = exeInfo.DirectoryName + "\\";

            connectionString = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + path + "user data\\excel files\\" + strExcelFileName + ".xls;" + "Extended Properties='Excel 5.0;HDR=YES;'";

            connStringWithoutHDR = "Provider=Microsoft.Jet.OLEDB.4.0;" + "Data Source=" + path + "user data\\excel files\\" + strExcelFileName + ".xls;" + "Extended Properties='Excel 5.0;HDR=NO;'";

            connection = new OleDbConnection(connectionString);

            connWithoutHDR = new OleDbConnection(connStringWithoutHDR);

        }

        //将excel文件内容读入DataTable

        public DataTable Excel2DataTable(int startLine, int endLine, string columns)

        {

            DataTable dt1 = new DataTable();

            DataTable dt2 = new DataTable();

            int readCount = 0;

            int i;

            try

            {

                string query = "select " + columns + " from [Sheet1$]";

                this.connWithoutHDR.Open();

                OleDbDataAdapter adapter = new OleDbDataAdapter(query, connWithoutHDR);

                adapter.Fill(dt1);

                connWithoutHDR.Close();

            }

            catch (OleDbException ex)

            {

                MessageBox.Show("Excel数据读取失败 ErrorCode: " + (ex.ErrorCode).ToString());

            }

            readCount = dt1.Rows.Count;

            if (readCount > endLine)

            {

                for (i = startLine - 1; i < endLine; i++)

                {

                    dt2.Rows.Add(dt1.Rows[i]);

                }

            }

            if (readCount >= startLine && readCount <= endLine)

            {

                for (i = startLine - 1; i < readCount; i++)

                {

                    dt2.Rows.Add(dt1.Rows[i]);

                }

            }

            return dt2;

        }

    }

}