查询Excel文件

//获取数据表中的数据
        public DataSet ExcelDataSource(string filepath, string sheetname)
        {
            string strConn;
            strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties=Excel 8.0;";
            OleDbConnection conn = new OleDbConnection(strConn);
            OleDbDataAdapter oada = new OleDbDataAdapter("select * from [" + sheetname + "$]", strConn);
            DataSet ds = new DataSet();
            oada.Fill(ds);
            return ds;
        }

        /// <summary>
        /// 获取数据列表
        /// </summary>
        /// <param name="filepath"></param>
        /// <returns></returns>
        public ArrayList ExcelSheetName(string filepath)
        {
            ArrayList al = new ArrayList();
            string strConn;
            strConn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filepath + ";Extended Properties=Excel 8.0;";
            OleDbConnection conn = new OleDbConnection(strConn);
            conn.Open();
            DataTable sheetNames = conn.GetOleDbSchemaTable
            (System.Data.OleDb.OleDbSchemaGuid.Tables, new object[] { null, null, null, "TABLE" });
            conn.Close();
            foreach (DataRow dr in sheetNames.Rows)
            {
                al.Add(dr[2]);
            }
            return al;
        }