protected override void OnLoad(EventArgs e)
        {
            if (!this.IsPostBack)
            {
                ReportViewerWebPart viewer = FindMainWebpart<ReportViewerWebPart>();
                if (viewer != null)
                {
                    viewer.OverrideParameters.Clear();
                    viewer.OverrideParameters.Add(new Microsoft.Reporting.WebForms.ReportParameter("aa", "13,14", false));
                    ReportViewer rptViewer = ReflectorUtils.getField<ReportViewer>("m_reportViewer", viewer);
                    rptViewer.ZoomMode = ZoomMode.PageWidth;

                }
            }

            base.OnLoad(e);
        }

        /// <summary>
        /// 找到页面的Webpart
        /// </summary>
        /// <param name="webPartZoneId">WebpartZone的Id</param>
        /// <returns></returns>
        protected T FindWebpart<T>(string webPartZoneId) where T : Microsoft.SharePoint.WebPartPages.WebPart
        {

            #region 已注释：通过Master找特定WebPartZone的控件

            //1.此种方式只能获取指定区域的Webpart
            //ContentPlaceHolder holder =(ContentPlaceHolder)Master.FindControl("PlaceHolderMain");
            //if (holder != null)
            //{
            //    WebPartZone zone = (WebPartZone)holder.FindControl("Main");
            //    foreach (WebPart control in zone.WebParts)
            //    {
            //        if (control is XsltListViewWebPart)
            //        {

            //        }
            //    }
            //}

            #endregion

            T result = default(T);

            SPWebPartManager sPWebPartManager = SPWebPartManagerInPage;
            if ((sPWebPartManager.Zones != null) && (sPWebPartManager.Zones.Count > 0))
            {
                foreach (Microsoft.SharePoint.WebPartPages.WebPartZone zone in sPWebPartManager.Zones)
                {
                    if (zone.ID == webPartZoneId)
                    {
                        foreach (Microsoft.SharePoint.WebPartPages.WebPart webpart in zone.WebParts)
                        {
                            if (webpart is T)
                            {
                                result = (T)webpart;
                                break;
                            }
                        }
                    }
                    if (result != null)
                    {
                        break;
                    }
                }
            }
            return result;
        }

        /// <summary>
        /// 
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <returns></returns>
        protected T FindMainWebpart<T>() where T : Microsoft.SharePoint.WebPartPages.WebPart
        {
            return FindWebpart<T>("Main");
        }