說明：以下更改基於Version 7.5.1 - 2015-6-9 原始碼下載地址：https://github.com/Webdiyer/AspNetPagerCN/releases

1.通過url方式更改PageSize

        public int PageSize
        {
            get
            {
//檢測使用UrlPageSizeName引數
                if (!string.IsNullOrEmpty(UrlPageSizeName) && !DesignMode)
                {
                    int pageSize;
                    if (int.TryParse(Page.Request.QueryString[UrlPageSizeName], out pageSize))
                    {
                        if (pageSize > 0)
                            return pageSize;
                    }
                }
//End


                if (null != cloneFrom)
                    return cloneFrom.PageSize;
                object obj = ViewState["PageSize"];
                return (obj == null) ? 10 : (int)obj;
            }
            set
            {
                ViewState["PageSize"] = value;
            }
        }
 

a)在Properties.cs檔案中增加ShowPageSizeBox屬性

        /// <include file='AspNetPagerDocs.xml' path='AspNetPagerDoc/Property[@name="ShowPageSizeBox"]/*'/>
        [Browsable(true), ANPCategory("cat_PageSizeBox"), DefaultValue(null), ANPDescription("desc_ShowPageSizeBox")]
        public bool ShowPageSizeBox
        {
            get
            {
                if (null != cloneFrom)
                    return cloneFrom.ShowPageSizeBox;
                object obj = ViewState["ShowPageSizeBox"];

                //此處為當未設定ShowPageSizeBox屬性時，取web.config中AppSettings的ShowPageSizeBox
                if (obj == null)
                {
                    obj = System.Configuration.ConfigurationManager.AppSettings["ShowPageSizeBox"];
                }
                return (obj == null) ? false : bool.Parse(obj.ToString());
            }
            set { ViewState["ShowPageSizeBox"] = value; }
        }
 

            ...
            //上面的程式碼省略，此處為要新增的程式碼
            if (ShowPageSizeBox && this.PageSize < this.RecordCount)
            {
                string sizeClientId = UniqueID + "_ChangePageSize";
                writer.Write("  每頁顯示條數：");
                writer.AddAttribute(HtmlTextWriterAttribute.Name, sizeClientId);
                writer.AddAttribute(HtmlTextWriterAttribute.Id, sizeClientId);
                writer.AddAttribute(HtmlTextWriterAttribute.Onchange, Page.ClientScript.GetPostBackEventReference(this, null));


                writer.RenderBeginTag(HtmlTextWriterTag.Select);
                listPageSize(writer);
                writer.RenderEndTag();
            }
            //結束
        }//end RenderPagingElements
 

        void listPageSize(HtmlTextWriter writer)
        {
            for (int i = 10; i <= 50; i+=5)
            {
                writer.Write("<option value=\"");
                writer.Write(i);
                writer.Write("\"");
                if (i == PageSize)
                    writer.Write(" selected=\"true\"");
                writer.Write(">");
                writer.Write(i);
                writer.Write("</option>");
            }
        }

        /// <include file='AspNetPagerDocs.xml' path='AspNetPagerDoc/Method[@name="OnLoad"]/*'/>
        protected override void OnLoad(EventArgs e)
        {
            if (UrlPaging)
            {
                currentUrl = Page.Request.Path;
                queryString = Page.Request.ServerVariables["Query_String"];
                if (!string.IsNullOrEmpty(queryString) && queryString.StartsWith("?")) //mono <v2.8 compatible
                    queryString = queryString.TrimStart('?');
                if (!Page.IsPostBack && cloneFrom == null)
                {
                    int index;
                    int.TryParse(Page.Request.QueryString[UrlPageIndexName], out index);
                    if (index <= 0)
                        index = 1;
                    else if (ReverseUrlPageIndex)
                        index = PageCount - index + 1;
                    PageChangingEventArgs args = new PageChangingEventArgs(index);
                    OnPageChanging(args);
                }
            }
            else
            {
                inputPageIndex = Page.Request.Form[UniqueID + "_input"];

                #region ########## 新增ShowPageSizeBox屬性 ##################
                if (null != Page.Request.Form[UniqueID + "_ChangePageSize"])
                {
                    this.PageSize = int.Parse(Page.Request.Form[UniqueID + "_ChangePageSize"]);
                }
                #endregion

            }
            base.OnLoad(e);
            if ((UrlPaging || (!UrlPaging && PageIndexBoxType == PageIndexBoxType.TextBox)) && (ShowPageIndexBox == ShowPageIndexBox.Always || (ShowPageIndexBox == ShowPageIndexBox.Auto && PageCount >= ShowBoxThreshold)))
            {
                HttpContext.Current.Items[scriptRegItemName] = true;
            }
        }

  <Property name="ShowPageSizeBox">
    <summary>
      獲取或設定每頁顯示記錄數。
    </summary>
    <value>
      一個布林型
    </value>
  </Property>