ASP.NET 2.0 — DataList分页 （转）
DataList分页
首先说明下：并非全部本人原创，大部分参考了别人的代码，我只是修正了一点bug而已。
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前台代码：
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="test.aspx.cs" Inherits="News_test" %>
<!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>
<TABLE id="Table1" style="Z-INDEX: 101; LEFT: 32px; WIDTH: 752px; POSITION: absolute; TOP: 16px; HEIGHT: 312px" cellSpacing="0" cellPadding="0" width="752" border="0">
<TR>
<TD style="HEIGHT: 29px"><FONT face="宋体">DataList分页技术和超级链接</FONT></TD>
</TR>
<TR>
<TD style="HEIGHT: 252px">
<asp:datalist id="DataList1" runat="server" Width="576px" Height="96px">
<HeaderTemplate>
定单编号<td>
员工编号<td>
定单日期<td>
运费<td>
运往所在城市
</HeaderTemplate>
<ItemTemplate>
<%# DataBinder.Eval(Container.DataItem,"OrderID")%> <td>
<%# DataBinder.Eval(Container.DataItem,"CustomerID")%> <td>
<%# DataBinder.Eval(Container.DataItem,"OrderDate")%> <td>
<%# DataBinder.Eval(Container.DataItem,"Freight")%> <td>
<%# DataBinder.Eval(Container.DataItem,"ShipCity")%>
</ItemTemplate>
</asp:datalist>
</TD>
</TR>
<TR>
<TD><FONT face="宋体">
<asp:linkbutton id="FirstLB" runat="server" OnCommand="LinkButton_Click" CommandName="first">第一页</asp:linkbutton>
<asp:linkbutton id="PreviousLB" runat="server" OnCommand="LinkButton_Click" CommandName="prev">上一页</asp:linkbutton>
<asp:linkbutton id="NextLB" runat="server" OnCommand=LinkButton_Click CommandName="next">下一页</asp:linkbutton>
<asp:linkbutton id="EndLB" runat="server" OnCommand=LinkButton_Click CommandName="end">最后一页</asp:linkbutton>
总<asp:label id="TotalLbl" runat="server"></asp:label>页 当前第<asp:label id="CurrentLbl" runat="server"></asp:label>页
<asp:linkbutton id="JumpLB" runat="server" OnCommand=LinkButton_Click CommandName="jump">跳到</asp:linkbutton>第
<asp:textbox id="TextBox1" runat="server" Width="90px"></asp:textbox>
页</FONT></TD>
</TR>
</TABLE>
</div>
</form>
</body>
</html>
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后台代码：
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using System;
using System.Data;
using System.Configuration;
using System.Collections;
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.Data.SqlClient;
public partial class News_test : System.Web.UI.Page
{
int CurrentPage;//当前页数
int PageSize; //每页条数
int PageCount; //总页数
int RecordCount;//总条数
private void Page_Load(object sender, System.EventArgs e)
{
// 在此处放置用户代码以初始化页面
PageSize = 10;//每页10条记录
if (!Page.IsPostBack)
{
CurrentPage = 0;//当前页习惯设为0
ViewState["PageIndex"] = 0;//页索引也设为0
//计算总共有多少记录
RecordCount = CalculateRecord();
//计算总共有多少页
if (RecordCount % PageSize == 0)
{
PageCount = RecordCount / PageSize;
}
else
{
PageCount = RecordCount / PageSize + 1;
}
this.TotalLbl.Text = PageCount.ToString();//显示总页数
ViewState["PageCount"] = PageCount;//会话session 对整个 application 有效 ，而视图状态 viewstate相当于某个页面的 session
this.DataListBind();//不可以放在初始化条件之前就绑定，那样的话，如果仅有一页的数据，“下一页”页仍然显示
}
}
//计算总共有多少条记录
private int CalculateRecord()
{
try
{
int recordCount;
SqlConnection con = new SqlConnection("server=127.0.0.1;database=Northwind;uid=sa;pwd=sa");//数据库使用Northwind;
con.Open();
string sql = "select count(*) as count from Orders";
SqlCommand cmd = new SqlCommand(sql, con);
SqlDataReader sdr = cmd.ExecuteReader();
if (sdr.Read())
{
recordCount = Int32.Parse(sdr["count"].ToString());
}
else
{
recordCount = 0;
}
sdr.Close();
con.Close();
return recordCount;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
//将数据绑定到Datalist控件
public void DataListBind()
{
try
{
int StartIndex = CurrentPage * PageSize;//设定导入的起终地址
string sql = "select * from Orders";
DataSet ds = new DataSet();
SqlConnection con = new SqlConnection("server=127.0.0.1;database=Northwind;uid=sa;pwd=sa");
con.Open();
SqlDataAdapter sda = new SqlDataAdapter(sql, con);
sda.Fill(ds, StartIndex, PageSize, "orders");//这是sda.Fill方法的第一次重载，里面的变量分别是数据集DataSet ,开始记录数StartRecord，最大的记录数MaxRecord，数据表名TableName
this.DataList1.DataSource = ds.Tables["orders"].DefaultView;
this.DataList1.DataBind();
this.PreviousLB.Enabled = true;
this.NextLB.Enabled = true;
if (CurrentPage == (PageCount - 1)) this.NextLB.Enabled = false;//当为最后一页时，下一页链接按钮不可用
if (CurrentPage == 0) this.PreviousLB.Enabled = false;//当为第一页时，上一页按钮不可用
this.CurrentLbl.Text = (CurrentPage + 1).ToString();//当前页数
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
}
public void LinkButton_Click(Object sender, CommandEventArgs e)//自己编写的按钮点击事件
{
CurrentPage = (int)ViewState["PageIndex"];//获得当前页索引
PageCount = (int)ViewState["PageCount"];//获得总页数
string cmd = e.CommandName;
//判断cmd，以判定翻页方向
switch (cmd)
{
case "prev"://上一页
if (CurrentPage > 0) CurrentPage--;
break;
case "next":
if (CurrentPage < (PageCount - 1)) CurrentPage++;//下一页
break;
case "first"://第一页
CurrentPage = 0;
break;
case "end"://最后一页
CurrentPage = PageCount - 1;
break;
case "jump"://跳转到第几页
if (this.TextBox1.Text.Trim() == "" || Int32.Parse(this.TextBox1.Text.Trim()) > PageCount)//如果输入数字为空或超出范围则返回
{
return;
}
else
{
CurrentPage = Int32.Parse(this.TextBox1.Text.ToString()) - 1;
break;
}
}
ViewState["PageIndex"] = CurrentPage;//获得当前页
this.DataListBind();//重新将DataList绑定到数据库
}
}
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实际使用的时候，要对“跳转”到的文本框输入值进行正整数的验证。
