.NET2.0DataList分页_[Asp.Net教程]

今天做了一个简单的在DataList中分页的小东西.用到的核心的东西就是PageDataSource类.和repeater的分页思想是一样的。

代码如下:

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 DataListPage : System.Web.UI.Page
{
private const int PAGESIZE = 3;//声明每一页包含的记录数
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.DataListBind(this.getDataView());
int currentPageIndex = 1;//指定当前页
ViewState["currentPageIndex"] = currentPageIndex;
}

}
///

/// 向后
///

///
///
protected void Button1_Click(object sender, EventArgs e)
{
//首先判断显示的记录数是否已经超过了所有的记录数
if ((int)ViewState["currentPageIndex"] * PAGESIZE < this.CaculateRecordCount())
{
int recordIndex = ((int)ViewState["currentPageIndex"]) * PAGESIZE;//计算当前页要显示的记录的索引
this.DataListBind(this.getDataView(recordIndex, PAGESIZE));//绑定到DATALIST
ViewState["currentPageIndex"] = (int)ViewState["currentPageIndex"] + 1;//当前页加1
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "kk", "alert('到底最后一页')", true);
}
}
///

/// 返回记录的总数目
///

/// 记录的总条数
private int CaculateRecordCount()
{
SqlConnection conn = new SqlConnection("server=.;database=northwind;uid=sa;pwd=sa");
conn.Open();
//计算所有的记录数
SqlDataAdapter da = new SqlDataAdapter("select count(*) as rc from region", conn);
int rc = (int)da.SelectCommand.ExecuteScalar();
conn.Close();
return rc;
}
///

/// 向前
///

///
///
protected void Button2_Click(object sender, EventArgs e)
{
if ((int)ViewState["currentPageIndex"] > 1)
{
int recordIndex = ((int)ViewState["currentPageIndex"] - 2) * PAGESIZE;//计算当前也要显示的首记录的索引
this.DataListBind(this.getDataView(recordIndex, PAGESIZE));//绑定
ViewState["currentPageIndex"] = (int)ViewState["currentPageIndex"] - 1;//当前页码减1
}
else
{
Page.ClientScript.RegisterStartupScript(this.GetType(), "kk", "alert('到达第一页!')",true );
}
}
///

/// 页面刚加载时产生绑定视图
///

///
private DataView getDataView()
{
SqlConnection conn = new SqlConnection("server=.;database=northwind;uid=sa;pwd=sa");
SqlDataAdapter da = new SqlDataAdapter("select * from region", conn);
DataSet ds = new DataSet();
da.Fill(ds);
return ds.Tables[0].DefaultView;
}
///

/// 翻页的时候产生绑定视图
///

/// 该也要加载的首记录的索引
/// 页面的记录大小
///
private DataView getDataView(int recordIndex, int pageSize)
{
SqlConnection conn = new SqlConnection("server=.;database=northwind;uid=sa;pwd=sa");
SqlDataAdapter da = new SqlDataAdapter("select * from region", conn);
DataSet ds = new DataSet();
da.Fill(ds, recordIndex, pageSize, "tt");//将首记录索引为recordIndex开始的pagesize条记录填充到数据集
return ds.Tables["tt"].DefaultView;
}
///

/// 绑定datalist
///

/// 数据源
private void DataListBind(DataView dv)
{
PagedDataSource pds = new PagedDataSource();
pds.PageSize = PAGESIZE;
pds.AllowPaging = true;
pds.DataSource = dv;
this.DataList1.DataSource = pds;
this.DataList1.DataBind();
}
}

前台:

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="DataListPage.aspx.cs" Inherits="DataListPage" %>

<%#DataBinder.Eval(Container .DataItem ,"regionid") %>

<%#DataBinder.Eval(Container .DataItem ,"regiondescription" )%>



onClick="Button2_Click" Text="Prev" />
onClick="Button1_Click" Text="Next" />



如果SQL语句换成存储过程，也很容易实现。

来源：sdtsfhh的blog