分享一个linq分页

   LInq分页

   

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&nbsp;&nbsp;&nbsp;&nbsp";
        pagestr += page > 1 ? "<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首页</a>&nbsp;&nbsp;<a 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 ? "&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 + "\">下一页</a>&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "\">末页</a>" : " 下一页 末页";
        return pagestr;
    }

调用 label1.Test=GetPageNum(控件名称，每页显示条数，linq查询语句)

普通分页
 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&nbsp;&nbsp;&nbsp;&nbsp";
        pagestr += page > 1 ? "<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首页</a>&nbsp;&nbsp;<a 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 ? "&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 + "\">下一页</a>&nbsp;&nbsp;<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "\">末页</a>" : " 下一页 末页";
        return pagestr;
    }

调用 label1.Test=GetPageNum(datatable,控件名称，每页显示条数)