原文出處：

http://www.cnblogs.com/wangchuang/p/5546345.html

/// 常用工具類——Excel操作類
    /// <para>　------------------------------------------------</para>
    /// <para>　CreateConnection：根據Excel檔案路徑和EXCEL驅動版本生成OleConnection物件例項</para>
    /// <para>　ExecuteDataSet：執行一條SQL語句，返回一個DataSet物件</para>
    /// <para>　ExecuteDataTable：執行一條SQL語句，返回一個DataTable物件</para>
    /// <para>　ExecuteDataAdapter：表示一組資料命令和一個數據庫連線，它們用於填充 DataSet 和更新資料來源。</para>
    /// <para>　ExecuteNonQuery：執行資料庫語句返回受影響的行數，失敗或異常返回-1[通常為:INSERT、DELETE、UPDATE 和 SET 語句等命令]。</para>
    /// <para>　ExecuteScalar：執行資料庫語句返回第一行第一列，失敗或異常返回null</para>
    /// <para>　ExecuteDataReader：執行資料庫語句返回一個自進結果集流</para>
    /// <para>　GetWorkBookName：獲取Excel中的所有工作簿</para>
using System;
using System.Configuration;
using System.Web;
using System.Data;
using System.Data.OleDb;
using System.Data.SqlClient;
  
namespace Utils
{
    /// <summary>
    /// <para>　</para>
    /// 常用工具類——Excel操作類
    /// <para>　------------------------------------------------</para>
    /// <para>　CreateConnection：根據Excel檔案路徑和EXCEL驅動版本生成OleConnection物件例項</para>
    /// <para>　ExecuteDataSet：執行一條SQL語句，返回一個DataSet物件</para>
    /// <para>　ExecuteDataTable：執行一條SQL語句，返回一個DataTable物件</para>
    /// <para>　ExecuteDataAdapter：表示一組資料命令和一個數據庫連線，它們用於填充 DataSet 和更新資料來源。</para>
    /// <para>　ExecuteNonQuery：執行資料庫語句返回受影響的行數，失敗或異常返回-1[通常為:INSERT、DELETE、UPDATE 和 SET 語句等命令]。</para>
    /// <para>　ExecuteScalar：執行資料庫語句返回第一行第一列，失敗或異常返回null</para>
    /// <para>　ExecuteDataReader：執行資料庫語句返回一個自進結果集流</para>
    /// <para>　GetWorkBookName：獲取Excel中的所有工作簿</para>
    /// </summary>
    public class ExcelHelper
    {
        private ExcelHelper() { }
  
        #region EXCEL版本
        /// <summary>
        /// EXCEL版本
        /// </summary>
        public enum ExcelVerion
        {
            /// <summary>
            /// Excel97-2003版本
            /// </summary>
            Excel2003,
            /// <summary>
            /// Excel2007版本
            /// </summary>
            Excel2007
        }
        #endregion
  
        #region 根據EXCEL路徑生成OleDbConnectin物件
        /// <summary>
        /// 根據EXCEL路徑生成OleDbConnectin物件
        /// </summary>
        /// <param name="ExcelFilePath">EXCEL檔案相對於站點根目錄的路徑</param>
        /// <param name="Verion">Excel資料驅動版本：97-2003或2007,分別需要安裝資料驅動軟體</param>
        /// <returns>OleDbConnection物件</returns>
        public static OleDbConnection CreateConnection(string ExcelFilePath,ExcelVerion Verion)
        {
            OleDbConnection Connection = null;
            string strConnection = string.Empty;
            try
            {
                switch (Verion)
                {
                    case ExcelVerion.Excel2003: //讀取Excel97-2003版本
                        strConnection = "Provider=Microsoft.Jet.OLEDB.4.0; " +
"Data Source=" + HttpContext.Current.Server.MapPath(ExcelFilePath) + ";Extended Properties=Excel 8.0";
                        break;
                    case ExcelVerion.Excel2007: //讀取Excel2007版本
                         strConnection = "Provider=Microsoft.ACE.OLEDB.12.0;Extended Properties='Excel 12.0;HDR=YES';data source=" + ExcelFilePath;
                        break;
                }               
               if(!string.IsNullOrEmpty(strConnection)) Connection = new OleDbConnection(strConnection);
            }
            catch (Exception)
            {
            }
  
            return Connection;
        }        
        #endregion
  
        #region 建立一個OleDbCommand物件例項
        /// <summary>
        /// 建立一個OleDbCommand物件例項
        /// </summary>
        /// <param name="CommandText">SQL命令</param>
        /// <param name="Connection">資料庫連線物件例項OleDbConnection</param>
        /// <param name="OleDbParameters">可選引數</param>
        /// <returns></returns>
        private static OleDbCommand CreateCommand(string CommandText, OleDbConnection Connection, params System.Data.OleDb.OleDbParameter[] OleDbParameters)
        {
            if (Connection.State == ConnectionState.Closed)
                Connection.Open();
            OleDbCommand comm = new OleDbCommand(CommandText, Connection);
            if (OleDbParameters != null)
            {
                foreach (OleDbParameter parm in OleDbParameters)
                {
                    comm.Parameters.Add(parm);
                }
            }
            return comm;
        }
        #endregion
  
        #region 執行一條SQL語句，返回一個DataSet物件
        /// <summary>
        /// 執行一條SQL語句，返回一個DataSet物件
        /// </summary>
        /// <param name="Connection">OleDbConnection物件</param>
        /// <param name="CommandText">SQL語句</param>
        /// <param name="OleDbParameters">OleDbParameter可選引數</param>
        /// <returns>DataSet物件</returns>
        public static DataSet ExecuteDataSet(OleDbConnection Connection, string CommandText, params OleDbParameter[] OleDbParameters)
        {
            DataSet ds = new DataSet();
            try
            {
                OleDbCommand comm = CreateCommand(CommandText, Connection, OleDbParameters);
                OleDbDataAdapter da = new OleDbDataAdapter(comm);
                da.Fill(ds);
            }
            catch (Exception)
            {
            }
            finally
            {
                if (Connection.State == ConnectionState.Open) Connection.Close();
            }
  
            return ds;
        }
        #endregion
  
        #region 執行一條SQL語句,返回一個DataTable物件
        /// <summary>
        /// 執行一條SQL語句,返回一個DataTable物件
        /// </summary>
        /// <param name="Connection">OleDbConnection物件</param>
        /// <param name="CommandText">SQL語句</param>
        /// <param name="OleDbParameters">OleDbParameter可選引數</param>
        /// <returns>DataSet物件</returns>
        public static DataTable ExecuteDataTable(OleDbConnection Connection, string CommandText, params OleDbParameter[] OleDbParameters)
        {
            DataTable Dt = null;
            try
            {
                OleDbCommand comm = CreateCommand(CommandText, Connection, OleDbParameters);
                OleDbDataAdapter da = new OleDbDataAdapter(comm);
                DataSet Ds = new DataSet();
                da.Fill(Ds);
                Dt = Ds.Tables[0];
            }
            catch (Exception)
            {
            }
            finally
            {
                if (Connection.State == ConnectionState.Open) Connection.Close();
            }
            return Dt;
        }
  
        #endregion
  
        #region 表示一組資料命令和一個數據庫連線，它們用於填充 DataSet 和更新資料來源。
        /// <summary>
        /// 表示一組資料命令和一個數據庫連線，它們用於填充 DataSet 和更新資料來源。
        /// </summary>
        /// <param name="Connection">OleDbConnection物件</param>
        /// <param name="CommandText">SQL語句</param>
        /// <param name="OleDbParameters">OleDbParameter可選引數</param>
        /// <returns></returns>
        public static OleDbDataAdapter ExecuteDataAdapter(OleDbConnection Connection, string CommandText, params System.Data.OleDb.OleDbParameter[] OleDbParameters)
        {
            OleDbDataAdapter Da = null;
            try
            {
                OleDbCommand comm = CreateCommand(CommandText, Connection, OleDbParameters);
                Da = new OleDbDataAdapter(comm);
                OleDbCommandBuilder cb = new OleDbCommandBuilder(Da);
            }
            catch (Exception)
            {
            }
            finally
            {
                if (Connection.State == ConnectionState.Open) Connection.Close();
            }
            return Da;
        }
        #endregion
  
        #region 執行資料庫語句返回受影響的行數，失敗或異常返回-1[通常為:INSERT、DELETE、UPDATE 和 SET 語句等命令]。
        /// <summary>
        /// 執行資料庫語句返回受影響的行數，失敗或異常返回-1[通常為:INSERT、DELETE、UPDATE 和 SET 語句等命令]。
        /// </summary>
        /// <param name="Connection">OleDbConnection物件</param>
        /// <param name="CommandText">SQL語句</param>
        /// <param name="OleDbParameters">OleDbParameter可選引數</param>
        /// <returns>受影響的行數</returns>
        public static int ExecuteNonQuery(OleDbConnection Connection, string CommandText, params System.Data.OleDb.OleDbParameter[] OleDbParameters)
        {
            int i = -1;
            try
            {
                if (Connection.State == ConnectionState.Closed) Connection.Open();
                OleDbCommand comm = CreateCommand(CommandText, Connection, OleDbParameters);
                i = comm.ExecuteNonQuery();
            }
            catch (Exception)
            {
            }
            finally
            {
                if (Connection.State == ConnectionState.Open) Connection.Close();
            }
            return i;
        }
        #endregion
  
        #region 執行資料庫語句返回第一行第一列，失敗或異常返回null
        /// <summary>
        /// 執行資料庫語句返回第一行第一列，失敗或異常返回null
        /// </summary>
        /// <param name="Connection">OleDbConnection物件</param>
        /// <param name="CommandText">SQL語句</param>
        /// <param name="OleDbParameters">OleDbParameter可選引數</param>
        /// <returns>第一行第一列的值</returns>
        public static object ExecuteScalar(OleDbConnection Connection, string CommandText, params System.Data.OleDb.OleDbParameter[] OleDbParameters)
        {
            object Result = null;
            try
            {
                OleDbCommand comm = CreateCommand(CommandText, Connection, OleDbParameters);
                Result = comm.ExecuteScalar();
            }
            catch (Exception)
            {
            }
            finally
            {
                if (Connection.State == ConnectionState.Open) Connection.Close();
            }
            return Result;
        }
        #endregion
  
        #region 執行資料庫語句返回一個自進結果集流
        /// <summary>
        /// 執行資料庫語句返回一個自進結果集流
        /// </summary>
        /// <param name="Connection">OleDbConnection物件</param>
        /// <param name="CommandText">SQL語句</param>
        /// <param name="OleDbParameters">OleDbParameter可選引數</param>
        /// <returns>DataReader物件</returns>
        public static OleDbDataReader ExecuteDataReader(OleDbConnection Connection, string CommandText, params System.Data.OleDb.OleDbParameter[] OleDbParameters)
        {
            OleDbDataReader Odr = null;
            try
            {
                OleDbCommand comm = CreateCommand(CommandText, Connection, OleDbParameters);
                Odr = comm.ExecuteReader();
            }
            catch (Exception)
            {
            }
            finally
            {
                if (Connection.State == ConnectionState.Open) Connection.Close();
            }
            return Odr;
        }
        #endregion
  
        #region 獲取Excel中的所有工作簿
        /// <summary>
        /// 獲取Excel中的所有工作簿
        /// </summary>
        /// <param name="Connection">OleDbConnection物件</param>
        /// <returns></returns>
        public static DataTable GetWorkBookName(OleDbConnection Connection)
        {
            DataTable Dt = null;
            try
            {
                if (Connection.State == ConnectionState.Closed) Connection.Open();
                Dt = Connection.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);
            }
            catch (Exception)
            {
            }
            finally
            {
                if (Connection.State == ConnectionState.Open) Connection.Close();
            }
            return Dt;
        }
        #endregion
    }
}