asp.net中一个linq分页实现代码

  LInq分页

  

复制代码 代码如下:

  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 href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首页</a>  <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 ? "  <font color=\"#ff0000\">" + i + "</font>" : "  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "\">" + i + "</a>";

  }

  pagestr += page != allpage ? "  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "\">下一页</a>  <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

  

复制代码 代码如下:

  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 href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首页</a>  <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 ? "  <font color=\"#ff0000\">" + i + "</font>" : "  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "\">" + i + "</a>";

  }

  pagestr += page != allpage ? "  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "\">下一页</a>  <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)