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using System;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Rdh2010.Common;
public partial class Admin_News_NewsManage : Rdh2010.Web.UI.BasePage
{
protected int PageIndex = 1;
protected int PageSize = 12;
protected string ids = "";
protected string PageInfo = "";
protected string strWhere = "";
protected string ConnectionString = ConfigurationManager.AppSettings["ConnectionString"].ToString();
protected SqlConnection conn;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
//CheckLogin();
}
conn = new SqlConnection(ConnectionString);
PageIndex = Convert.ToInt32(Request.QueryString["page"]);
Show = Convert.ToBoolean(Request.QueryString["Show"]);
newsId = Convert.ToInt32(Request.QueryString["ID"]);
Alt = Request.QueryString["Alt"];
ids = Request.Form["Item"];
strWhere = "ID>0";
Rdh2010.BLL.News bllNews = new Rdh2010.BLL.News();
conn.Open();
#region 分頁(yè)
if (PageIndex < 1)//保證頁(yè)碼大于0
{
PageIndex = 1;
}
int countNum = bllNews.CountList(conn,strWhere);//新聞總條數(shù)
if (countNum > 0)
{
int PageCount;//總頁(yè)數(shù)
if ((countNum % PageSize) == 0)
{
PageCount = countNum / PageSize;//恰好整除，則商為總頁(yè)數(shù)
}
else
{
PageCount = countNum / PageSize + 1;//不能整除，則總頁(yè)數(shù)為商加1
}
if ((0 < PageCount) && (PageCount < PageIndex))//如果總頁(yè)數(shù)大于0，且當(dāng)前頁(yè)值大于總頁(yè)數(shù)，則置于最后頁(yè)。
{
PageIndex = PageCount;
}//如果新聞條數(shù)為0，即總頁(yè)數(shù)為0，則置于第一頁(yè)：PageIndex值為1。
PageInfo = Paging(PageIndex, PageCount, "NewsManage.aspx");
}
else
{
PageInfo = "沒(méi)有相關(guān)信息！";
}
#endregion
RepeaterDataBind(PageIndex);//注意，數(shù)據(jù)綁定不能寫(xiě)在這里：if (!IsPostBack){ RepeaterDataBind(PageIndex); }，不然有這樣的情況發(fā)生：最后一頁(yè)只有一條新聞，點(diǎn)擊刪除之后，頁(yè)碼停留在最后一頁(yè)，但最后一頁(yè)沒(méi)有新聞條目。即每一次刷新都要重新綁定。
conn.Close();
}
/// <summary>
/// 綁定Repeater數(shù)據(jù)
/// </summary>
private void RepeaterDataBind(int pageIndex)
{
Rdh2010.BLL.News bllNews = new Rdh2010.BLL.News();
SqlDataReader dr = bllNews.GetListReader(conn,pageIndex, PageSize, strWhere);
this.Repeater1.DataSource = dr;
this.Repeater1.DataBind();
dr.Close();
dr.Dispose();
}
/// <summary>
/// 分頁(yè)算法
/// </summary>
protected static string Paging(int pageIndex, int pageCount, string url)
{
if (url.IndexOf("?") >= 0)
{
　　　　　　　　　url += "&";
　　　　　　　}
else
　　　　　　　{
url += "?";
　　　　　　　}
int next = 0;
int pre = 0;
int startCount = 0;
int endCount = 0;
string retStr = "";
if (pageIndex < 1)
{
pageIndex = 1;
}
if (pageIndex > pageCount)
{
pageIndex = pageCount;
}
next = pageIndex + 1;
pre = pageIndex - 1;
startCount = (pageIndex + 5) > pageCount ? pageCount - 9 : pageIndex - 4;//中間頁(yè)起始序號(hào)
//中間頁(yè)終止序號(hào)
endCount = pageIndex < 5 ? 10 : pageIndex + 5;
if (startCount < 1)
{
startCount = 1;
} //為了避免輸出的時(shí)候產(chǎn)生負(fù)數(shù)，設(shè)置如果小于就從序號(hào)開(kāi)始
if (pageCount < endCount)
{
endCount = pageCount;
}//頁(yè)碼+5的可能性就會(huì)產(chǎn)生最終輸出序號(hào)大于總頁(yè)碼，那么就要將其控制在頁(yè)碼數(shù)之內(nèi)
//currentpagestr = "共" + pagecount + "頁(yè) ";
retStr += pageIndex > 1 ? "<a href="/" mce_href="/""" + url + "Page=1/">首頁(yè)</a> <a href="/" mce_href="/""" + url + "Page=" + pre + "/">上一頁(yè)</a> " : "";
//中間頁(yè)處理，這個(gè)增加時(shí)間復(fù)雜度，減小空間復(fù)雜度
for (int i = startCount; i <= endCount; i++)
{
retStr += pageIndex == i ? "<strong><" + i + "> </strong>" : "<a href="/" mce_href="/""" + url + "Page=" + i + "/">" + i + "</a> ";
}
retStr += pageIndex != pageCount ? "<a href="/" mce_href="/""" + url + "Page=" + next + "/">下一頁(yè)</a> <a href="/" mce_href="/""" + url + "Page=" + pageCount + "/">末頁(yè)</a>" : "";
return retStr;
}
}

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