从excel表格加载数据返回DataSet

添加命名空间：using System.Data.OleDb;
 /// <summary>
        /// 从excel表格加载数据返回DataSet
        /// </summary>
        /// <param name="path">excel路径</param>
        /// <param name="sql_Command">查询excel的sql命令，为“”或null默认查询Sheet1表</param>
        /// <returns>返回DataSet</returns>
        public static DataSet LoadFromExcel(string path,string sql_Command)
        {
            string strConn;
            /*
              HDR=NO: 第一行也作为数据行
              IMEX=1: 把所有列都做为字符串来读取
             */
            strConn = @"Provider=Microsoft.Ace.OleDb.12.0;" + "data source=" + path +
                 ";Extended Properties='Excel 12.0; HDR=NO; IMEX=1'"; //此連接可以操作.xls與.xlsx文件/此連接可以操作.xls與.xlsx文件
            OleDbConnection oleConn = new OleDbConnection(strConn);
            DataSet ds = new DataSet();
            if (sql_Command == null || sql_Command == "")
            {
                try
                {
                    oleConn.Open();
                    string sql = "select * from [Sheet1$]";
                    OleDbDataAdapter adapter = new OleDbDataAdapter(sql, oleConn);
                    adapter.Fill(ds);
                    return ds;
                }
                catch
                {
                    throw new Exception("加载失败！");
                }
                finally
                {
                    oleConn.Close();
                }
            }
            else
            {
                oleConn.Open();
                OleDbDataAdapter adapter = new OleDbDataAdapter(sql_Command, oleConn);
                adapter.Fill(ds);
                return ds;
            }
          
        }