運用SPQuery的RowLimit對SPListItemColliction進行分頁

本文通過SPQuery的RowLimit屬性來實現對moss文檔庫文檔的只取一定條目的分頁效果。

 

String queryString=="<Where><Contains><FieldRef Name='Status'/>" +
        "<Value Type='Text'>Com</Value></Contains></Where>";
//查詢'Status'包含Com的項;

 

SPList docLib= web.GetList("http://xxxx");

SPQuery query=new SPQuery();

query.Query=querysString；

//下面開始做判斷，主要運用viewstate來存儲相關值；

 

//查看viewstate是否爲空，如果爲空，則說明是首次查詢，並把queryString的值賦給viewstate;

 if (ViewState["querystring"] == null)
             ViewState["querystring"] = queryString;

             //下面判斷不爲空的情況，即頁面已經做過查詢了

               else
                {

                   

                   //此處判斷queryString是否已改變，即查詢條件是否改變

 

                    //下面的情況是查詢條件改變：
                    if (ViewState["querystring"].ToString() != queryString)
                    {

                    
                        Session["pageinfo"] = null;  //這個session是用來存儲item.ListItemCollictionPosition;
                        ViewState["querystring"] = queryString;
                    }
                    else
                    {

                        if (Session["pageinfo"] != null && repeat == 1)//repeat是用來區分是上一頁還是下一頁，1爲下一頁
                        {
                            string strpage = ((Microsoft.SharePoint.SPListItemCollectionPosition)Session["pageinfo"]).PagingInfo;

                            if (ViewState["pageindex"] == null)//用來儲存上一頁，當前頁，下一頁的item.ListItemCollictionPosition，通過這個只來判斷是那一頁；
                            {
                                ViewState["pageindex"] = strpage;
                            }
                            else
                            {
                                strpage = ViewState["pageindex"] + ";" + strpage;
                                ViewState["pageindex"] = strpage;
                            }
                        }
                    }
                }

query.RowLimit = (uint)docPerPage;//每頁的文檔數

 

 if (repeat == 1)
            {
                if (Session["pageinfo"] != null)
                    query.ListItemCollectionPosition = (Microsoft.SharePoint.SPListItemCollectionPosition)Session["pageinfo"];
            }
            if (repeat == 2)
            {

               //處理ViewState["pageindex"]；
                if (ViewState["pageindex"].ToString().Contains(";"))
                {
                    string[] strpage = ViewState["pageindex"].ToString().Split(';');

                    Session["pageinfo"] = new Microsoft.SharePoint.SPListItemCollectionPosition(strpage[strpage.Length - 2]);
                    query.ListItemCollectionPosition = (Microsoft.SharePoint.SPListItemCollectionPosition)Session["pageinfo"];
                    ViewState["pageindex"] = null;
                    for (int j = 0; j < strpage.Length - 1; j++)
                    {
                        if (j == 0)
                            ViewState["pageindex"] = strpage[j];
                        else
                            ViewState["pageindex"] = ViewState["pageindex"] + ";" + strpage[j];
                    }

                }
                else
                    ViewState["pageindex"] = null;

            }

 

 SPListItemCollection items = docLib.GetItems(query);

//你可以處理你的items了

 

//最後還要處理item.ListItemCollictionPosition;

 query.ListItemCollectionPosition = items.ListItemCollectionPosition;
            Session["pageinfo"] = items.ListItemCollectionPosition;
            if (Session["pageinfo"] == null)
            {
                lbNextPage.Enabled = false;
                lbNextPage2.Enabled = false;
            }
            else
            {
                lbNextPage.Enabled = true;
                lbNextPage2.Enabled = true;
            }
            if (ViewState["pageindex"] == null)
            {
                lbPrePage.Enabled = false;
                lbPerPage2.Enabled = false;
            }
            else
            {
                lbPrePage.Enabled = true;
                lbPerPage2.Enabled = true;
            }