Linq to shql 自定义分页示例
前台代码：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>无标题页</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:GridView ID="GridView1" runat="server"
DataKeyNames="Id">
<PagerSettings Visible="False" />
</asp:GridView>
</div>
<asp:Label ID="Label1" runat="server" Text="Label"></asp:Label>
<asp:Label ID="Label2" runat="server" Text="Label"></asp:Label>
<br />
<asp:LinkButton ID="LinkButton1" runat="server" onclick="LinkButton1_Click">首页</asp:LinkButton>
<asp:LinkButton ID="LinkButton2" runat="server" onclick="LinkButton2_Click">上一页</asp:LinkButton>
<asp:LinkButton ID="LinkButton3" runat="server" onclick="LinkButton3_Click">下一页</asp:LinkButton>
<asp:LinkButton ID="LinkButton4" runat="server" onclick="LinkButton4_Click">尾页</asp:LinkButton>
<br />
</form>
</body>
</html>
后台代码：
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml.Linq;
public partial class _Default : System.Web.UI.Page
{
DataConnectionDataContext db = new DataConnectionDataContext();
int pagesize = 5;//每页显示多少条记录
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
ViewState["pageindex"] = 0;
newsbind();
Label1.Text = num().ToString() + "记录";
Label2.Text = pagecount(pagesize).ToString() + "页";
}
}
//总记录数
private int num()
{
int count=from n db.News.Count();
return count;
}
//根据pagesize计算总页数
private int pagecount(int x)
{
int count = (num() + x) / x;
return count;
}
//绑定GridView
private void newsbind()
{
int pageindex = Convert.ToInt32(ViewState["pageindex"].ToString());
this.GridView1.DataSource = (from n in db.News
orderby n.Id descending
select new { n.Id, n.NewTitle, n.NewContext, n.NewImage, n.NewDate }).Skip(pagesize * pageindex).Take(pagesize);
this.GridView1.DataBind();
this.LinkButton2.Enabled = false;
this.LinkButton3.Enabled = false;
if (Convert.ToInt32(ViewState["pageindex"].ToString()) > 0)
{
this.LinkButton2.Enabled = true;
}
if (Convert.ToInt32(ViewState["pageindex"].ToString()) < pagecount(pagesize) -1 )
{
this.LinkButton3.Enabled = true;
}
}
protected void LinkButton1_Click(object sender, EventArgs e)
{
ViewState["pageindex"] = 0;
this.newsbind();
}
protected void LinkButton2_Click(object sender, EventArgs e)
{
ViewState["pageindex"] = Convert.ToInt32(ViewState["pageindex"].ToString()) - 1;
this.newsbind();
}
protected void LinkButton3_Click(object sender, EventArgs e)
{
ViewState["pageindex"] = Convert.ToInt32(ViewState["pageindex"].ToString()) + 1;
this.newsbind();
}
protected void LinkButton4_Click(object sender, EventArgs e)
{
ViewState["pageindex"] = pagecount(pagesize) - 1;
this.newsbind();
}
}
代码如下
var q =( from c in textuser where c.id >0 orderby c.id descending select new { ID = c.id, Sex = c.Sex == 1 ? "男" : "女", c.UserName }).ToList().Take
(3).Skip(0);
GridView1.DataSource = q;
GridView1.DataBind();
如果我要想显示，第一页的 内容怎么显示。
顺便问下。我现在的理解是 Take 设置页面记录数，Skip 是从哪条记录开始显示，不知道我这样理解 正确不？
---
int _page = 1;
int _pagesize = 40;
var q =( from c in textuser where c.id >0 orderby c.id descending select new { ID = c.id, Sex = c.Sex == 1 ? "男" : "女", c.UserName });
GridView1.DataSource =q.Skip((_page - 1) * _pagesize).Take(_pagesize).ToList();
GridView1.DataBind();
