asp.net中一个linq分页实现代码

 
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();//总数据量 
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; } 
//计算总页数 
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;//中间页起始序号 
//中间页终止序号 
endcount = page < 5 ? 10 : page + 5; 
if (startcount < 1) { startcount = 1; } //为了避免输出的时候产生负数，设置如果小于1就从序号1开始 
if (allpage < endcount) { endcount = allpage; } //页码+5的可能性就会产生最终输出序号大于总页码，那么就要将其控制在页码数之内 
pagestr = "共" + allpage + "页 "; 
pagestr += page > 1 ? "<a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首页</a><a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + pre + "\">上一页</a>" : "首页 上一页"; 
//中间页处理，这个增加时间复杂度，减小空间复杂度 
for (int i = startcount; i <= endcount; i++) 
{ 
pagestr += page == i ? "<font color=\"#ff0000\">" + i + "</font>" : "<a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "\">" + i + "</a>"; 
} 
pagestr += page != allpage ? "<a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "\">下一页</a><a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "\">末页</a>" : " 下一页 末页"; 
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; } 
//计算总页数 
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;//中间页起始序号 
//中间页终止序号 
endcount = page < 5 ? 10 : page + 5; 
if (startcount < 1) { startcount = 1; } //为了避免输出的时候产生负数，设置如果小于1就从序号1开始 
if (allpage < endcount) { endcount = allpage; } //页码+5的可能性就会产生最终输出序号大于总页码，那么就要将其控制在页码数之内 
pagestr = "共" + allpage + "页 "; 
pagestr += page > 1 ? "<a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首页</a><a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + pre + "\">上一页</a>" : "首页 上一页"; 
//中间页处理，这个增加时间复杂度，减小空间复杂度 
for (int i = startcount; i <= endcount; i++) 
{ 
pagestr += page == i ? "<font color=\"#ff0000\">" + i + "</font>" : "<a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "\">" + i + "</a>"; 
} 
pagestr += page != allpage ? "<a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "\">下一页</a><a rel="nofollow noopener noreferrer" href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "\">末页</a>" : " 下一页 末页"; 
return pagestr; 
} 

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