testDataContext dc = new testDataContext();
public string GetPageNum(GridView GridViewName, int pagesize, IQueryable<test> sql)
{
int page;
if (HttpContext.Current.Request.QueryString["page"] != null)
page = Convert.ToInt32(HttpContext.Current.Request.QueryString["page"]);
else
page = 1;
//var sql = from o in dc.test select o;
int total = sql.Count();//總數(shù)據(jù)量
var sqls = sql.Skip((page - 1) * pagesize).Take(pagesize);
GridViewName.DataSource = sqls;
GridViewName.DataBind();
int allpage = 0;
int next = 0;
int pre = 0;
int startcount = 0;
int endcount = 0;
string pagestr = "";
if (page < 1) { page = 1; }
//計算總頁數(shù)
if (pagesize != 0)
{
allpage = (total / pagesize);
allpage = ((total % pagesize) != 0 ? allpage + 1 : allpage);
allpage = (allpage == 0 ? 1 : allpage);
}
next = page + 1;
pre = page - 1;
startcount = (page + 5) > allpage ? allpage - 9 : page - 4;//中間頁起始序號
//中間頁終止序號
endcount = page < 5 ? 10 : page + 5;
if (startcount < 1) { startcount = 1; } //為了避免輸出的時候產(chǎn)生負數(shù)，設置如果小于1就從序號1開始
if (allpage < endcount) { endcount = allpage; } //頁碼+5的可能性就會產(chǎn)生最終輸出序號大于總頁碼，那么就要將其控制在頁碼數(shù)之內(nèi)
pagestr = "共" + allpage + "頁&nbsp;&nbsp;&nbsp;&nbsp";
pagestr += page > 1 ? "<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首頁</a>&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + pre + "\">上一頁</a>" : "首頁 上一頁";
//中間頁處理，這個增加時間復雜度，減小空間復雜度
for (int i = startcount; i <= endcount; i++)
{
pagestr += page == i ? "&nbsp;&nbsp;<font color=\"#ff0000\">" + i + "</font>" : "&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "\">" + i + "</a>";
}
pagestr += page != allpage ? "&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "\">下一頁</a>&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "\">末頁</a>" : " 下一頁 末頁";
return pagestr;
}

public static string GetPageNum(DataTable ds, DataList datalistname, int pagesize)
{
PagedDataSource objPds = new PagedDataSource();
objPds.DataSource = ds.DefaultView;
objPds.AllowPaging = true;
int total = ds.Rows.Count;
objPds.PageSize = pagesize;
int page;
if (HttpContext.Current.Request.QueryString["page"] != null)
page = Convert.ToInt32(HttpContext.Current.Request.QueryString["page"]);
else
page = 1;
objPds.CurrentPageIndex = page - 1;
datalistname.DataSource = objPds;
datalistname.DataBind();
int allpage = 0;
int next = 0;
int pre = 0;
int startcount = 0;
int endcount = 0;
string pagestr = "";
if (page < 1) { page = 1; }
//計算總頁數(shù)
if (pagesize != 0)
{
allpage = (total / pagesize);
allpage = ((total % pagesize) != 0 ? allpage + 1 : allpage);
allpage = (allpage == 0 ? 1 : allpage);
}
next = page + 1;
pre = page - 1;
startcount = (page + 5) > allpage ? allpage - 9 : page - 4;//中間頁起始序號
//中間頁終止序號
endcount = page < 5 ? 10 : page + 5;
if (startcount < 1) { startcount = 1; } //為了避免輸出的時候產(chǎn)生負數(shù)，設置如果小于1就從序號1開始
if (allpage < endcount) { endcount = allpage; } //頁碼+5的可能性就會產(chǎn)生最終輸出序號大于總頁碼，那么就要將其控制在頁碼數(shù)之內(nèi)
pagestr = "共" + allpage + "頁&nbsp;&nbsp;&nbsp;&nbsp";
pagestr += page > 1 ? "<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首頁</a>&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + pre + "\">上一頁</a>" : "首頁 上一頁";
//中間頁處理，這個增加時間復雜度，減小空間復雜度
for (int i = startcount; i <= endcount; i++)
{
pagestr += page == i ? "&nbsp;&nbsp;<font color=\"#ff0000\">" + i + "</font>" : "&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "\">" + i + "</a>";
}
pagestr += page != allpage ? "&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "\">下一頁</a>&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "\">末頁</a>" : " 下一頁 末頁";
return pagestr;
}