ASP.NET分页之自定义分页(假分页)
本文来自 CSDN 博客 作者:Cici Cheng
自定义分页中主要是有比较复杂的逻辑内容,其实思想还是比较简单。具体示例如下:
页面源码:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default2.aspx.cs" Inherits="Default2" %>
<!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>ASP.NET分页之自定义分页</title>
</head>
<body>
<form id="form1" runat="server">
<asp:DataList ID="DataList1" runat="server" DataKeyField="o_id" RepeatColumns="4" RepeatDirection="Horizontal">
<ItemTemplate>
<table>
<tr>
<td align="right">编号:</td>
<td><%# Eval("o_id") %></td>
</tr>
<tr>
<td align="right">县市名称:</td>
<td><%# Eval("o_name") %></td>
</tr>
<tr>
<td align="right">市编号:</td>
<td><%# Eval("c_id") %></td>
</tr>
</table>
</ItemTemplate>
</asp:DataList>
<br />
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td>
共<asp:Label ID="lblPageCount" runat="server" ForeColor="Red"></asp:Label>页, 当前第<asp:Label
ID="lblCurrPage" runat="server" ForeColor="Red"></asp:Label>页
共<asp:Label ID="lblTotalCount" runat="server" ForeColor="Red"></asp:Label>条记录, 每页显示<asp:Label
ID="lblPageSize" runat="server" Text="16" ForeColor="Red"></asp:Label>条
</td>
<td>
<asp:LinkButton ID="btnFirst" runat="server" OnClick="btnFirst_Click">首页</asp:LinkButton>
<asp:LinkButton ID="btnPrev" runat="server" OnClick="btnPrev_Click">上一页</asp:LinkButton>
<asp:LinkButton ID="btnNext" runat="server" OnClick="btnNext_Click">下一页</asp:LinkButton>
<asp:LinkButton ID="btnLast" runat="server" OnClick="btnLast_Click">尾页</asp:LinkButton>
跳到<asp:DropDownList ID="ddlPager" runat="server" Width="50" OnSelectedIndexChanged="ddlPager_SelectedIndexChanged"
AutoPostBack="true" />
页
</td>
</tr>
</table>
</form>
</body>
</html>
后台代码:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data;
public partial class Default2 : System.Web.UI.Page
{
//页面加载时默认显示第一页
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindPaging("1");
}
}
//首页按钮被点击
protected void btnFirst_Click(object sender, EventArgs e)
{
BindPaging("1");
}
//上一页页按钮被点击
protected void btnPrev_Click(object sender, EventArgs e)
{
BindPaging("-1");
}
//下一页页按钮被点击
protected void btnNext_Click(object sender, EventArgs e)
{
BindPaging("+1");
}
//尾页按钮被点击
protected void btnLast_Click(object sender, EventArgs e)
{
BindPaging("0");
}
//下拉列表框选项发生改变
protected void ddlPager_SelectedIndexChanged(object sender, EventArgs e)
{
BindPaging(ddlPager.Text);
}
private void BindPaging(string page)
{
SqlDataSource sqlds = new SqlDataSource();
sqlds.ConnectionString = ConfigurationManager.ConnectionStrings["connstr"].ConnectionString;
sqlds.SelectCommand = "SELECT * FROM [County]";
sqlds.SelectCommandType = SqlDataSourceCommandType.Text;
DataView dv = sqlds.Select(DataSourceSelectArguments.Empty) as DataView;
int totalCount = dv.Count;//总条数
int pageSize = 16;//每页显示条数
int pageCount = (totalCount % pageSize == 0) ? (totalCount / pageSize) : (totalCount / pageSize + 1);//总页数
int currPage; //当前页数
//设置当前页
switch (page)
{
//首页
case "1":
currPage = 1;
break;
//下一页
case "+1":
currPage = int.Parse(lblCurrPage.Text) + 1;
break;
//上一页
case "-1":
currPage = int.Parse(lblCurrPage.Text) - 1;
break;
//尾页
case "0":
currPage = pageCount;
break;
//下拉列表框直接传值时
default:
currPage = int.Parse(page);
break;
}
//加载DropDownList项
if (!IsPostBack)
{
for (int i = 1; i <= pageCount; i++)
{
ddlPager.Items.Add(i.ToString());
}
}
//设置分页信息的显示
lblCurrPage.Text = currPage.ToString();
lblPageCount.Text = pageCount.ToString();
lblPageSize.Text = pageSize.ToString();
lblTotalCount.Text = totalCount.ToString();
//设置翻页按钮的可用性
btnFirst.Enabled = btnPrev.Enabled = btnNext.Enabled = btnLast.Enabled = true;
if (currPage == 1)
{
btnFirst.Enabled = btnPrev.Enabled = false;
}
if (currPage == pageCount)
{
btnNext.Enabled = btnLast.Enabled = false;
}
ddlPager.Text = currPage.ToString();
//从查询出的所有记录中筛选出即将呈现的当前页的数据集合
int loopCount = (currPage == pageCount) ? totalCount - (currPage - 1) * pageSize : pageSize; //显示的记录条数
DataRowView[] drwsToBind = new DataRowView[loopCount];
for (int i = 0; i < loopCount; i++)
{
drwsToBind[i] = dv[(currPage - 1) * pageSize + i];
}
DataList1.DataSource = drwsToBind;
DataList1.DataBind();
}
}
预览效果
首页时"首页"和"上一页"按钮禁用,尾页时"下一页"和"尾页"按钮禁用。这里也可以将其隐藏,只需将btnFirst.Enabled=false改成btnFirst.Visible=false即可。另外翻页时下拉列表框和显示信息栏的当前页同时更新