oledbCommand.Parameters 图片varbinary存取

varbinay和Image一样，Image也是一样传

 private void testzp()
        {
            string fileName = @"D:\JTVMData\2017-04\2017-04-10\20170410125113652-3D-SideView.jpg";

            if (!File.Exists(fileName))
            {
                log.Error(string.Format("照片{0}不存在，无法上传", fileName));
                return;
            }

            byte[] bts = File.ReadAllBytes(fileName);
            string strSqlComm = "";
            try
            {
                strSqlComm = "insert into testzp (zp) Values (?)";
                sqlCommand.CommandText = strSqlComm;
                sqlCommand.Parameters.Add("", OleDbType.VarBinary).Value = bts;
                sqlCommand.ExecuteNonQuery();
            }
            catch (System.Exception ex)
            {
                ThrowException(string.Format("照片上传失败{0},消息 {1}", fileName, ex.Message));
            }

            strSqlComm = "select * from testzp where id = 1";

            sqlCommand.CommandText = strSqlComm;
            OleDbDataReader r = null;

            try
            {
                r = sqlCommand.ExecuteReader();

                while (r.Read())
                {
                    MemoryStream steam = new MemoryStream((byte[])r["zp"]);
                    System.Drawing.Image img = System.Drawing.Image.FromStream(steam, false);
                    img.Save("I:\\rrr.jpg");
                    
                }
                r.Close();
            }
            catch (Exception ex)
            {
                log.Error(ex.Message);
                ThrowException("从服务器获取排队数据异常");
            }
         }