2011.11.13修正：
1. 改正页数计算方法，以前的计算公式遇到整除就会多一页
2. 重发关键代码，以前因为编辑器的原因，部分代码会被过滤
3. 新增“转到[]页”功能
我们以前做ASP.NET网站，通常是把DataSet绑定到显示控件上，再用各种手段进行分页，比如PagedDataSource。然而，如果你是从业务层取数据，通常是一个List，这个时候就不能用以往的方法分页了。
一种办法是用ObjectDataSource，绑定GridView、ListView就可以分页，但如果遇到DataList或Repeater，就得自己写分页了。下面是我昨天写的List泛型分页Demo，有图有真相：
下面发代码：
List泛型分页通用类：
///
/// 泛型分页类
///
/// 类型
public class ListPager : List
{
private int _CurrentIndex;
private int _PageSize;
private int _TotalItem;
private int _PageCount;
///
/// 当前页码
///
public int CurrentIndex
{
get { return _CurrentIndex; }
set { _CurrentIndex = value; }
}
///
/// 每页大小
///
public int PageSize
{
get { return _PageSize; }
set { _PageSize = value; }
}
///
/// 记录总数
///
public int TotalItem
{
get { return _TotalItem; }
set { _TotalItem = value; }
}
///
/// 页面总数
///
public int PageCount
{
get { return _PageCount; }
set { _PageCount = value; }
}
///
/// 构造函数
///
///要分页的List泛型
///起始页码
///分页大小
public ListPager(List list, int index, int pageSize)
{
this._CurrentIndex = index;
this._PageSize = pageSize;
int startIndex = (this._CurrentIndex - 1) * PageSize;
for (int i = startIndex; i < startIndex + this._PageSize && i < list.Count; i++)
{
this.Add(list[i]);
}
this._TotalItem = list.Count;
//this._PageCount = (this._TotalItem / PageSize) + 1;
this.PageCount = (this._TotalItem + this.PageSize - 1) / this._PageSize;
}
}
测试用Model和模拟的Bll：
public partial class NewsModel
{
int _Id;
string _Title;
string _Content;
DateTime _Posttime;
public int Id
{
get { return _Id; }
set { _Id = value; }
}
public string Title
{
get { return _Title; }
set { _Title = value; }
}
public string Content
{
get { return _Content; }
set { _Content = value; }
}
public DateTime Posttime
{
get { return _Posttime; }
set { _Posttime = value; }
}
}
public class NewsBll
{
public List GetModels()
{
List list = new List()
{
new NewsModel(){ Id = 1, Content = "abcdef", Posttime = DateTime.Now, Title = "abc" },
new NewsModel(){ Id = 2, Content = "zxcvbn", Posttime = DateTime.Now, Title = "def" },
new NewsModel(){ Id = 3, Content = "qwerty", Posttime = DateTime.Now, Title = "ghi" },
new NewsModel(){ Id = 4, Content = "pijpas", Posttime = DateTime.Now, Title = "jkl" },
new NewsModel(){ Id = 5, Content = "geegwg", Posttime = DateTime.Now, Title = "mno" },
new NewsModel(){ Id = 6, Content = "jiojio", Posttime = DateTime.Now, Title = "pqr" },
new NewsModel(){ Id = 7, Content = "zpppaf", Posttime = DateTime.Now, Title = "stu" },
new NewsModel(){ Id = 8, Content = "1pijqs", Posttime = DateTime.Now, Title = "vwx" },
new NewsModel(){ Id = 9, Content = "1pijqs", Posttime = DateTime.Now, Title = "vwx" },
new NewsModel(){ Id = 10, Content = "twetwte", Posttime = DateTime.Now, Title = "yza" },
new NewsModel(){ Id = 11, Content = "qewqrzxf", Posttime = DateTime.Now, Title = "bcd" }
};
return list;
}
}
ASP.NET页面代码（部分）：
<h2>
ASP.NET泛型分页</h2>
<div>
<h3>
Repeater控件分页Demo</h3>
<ul>
<asp:Repeater ID="RptNews" runat="server">
<ItemTemplate>
<li>
<%# ((Model.NewsModel)Container.DataItem).Id %>,
<%# ((Model.NewsModel)Container.DataItem).Title %>,
<%# ((Model.NewsModel)Container.DataItem).Content %>,
<%# ((Model.NewsModel)Container.DataItem).Posttime %></li>
</ItemTemplate>
</asp:Repeater>
</ul>
<div>
<asp:Label ID="lblPageInfo" runat="server" Text="PageSize"></asp:Label>
<asp:Button ID="btnFirstPage" runat="server" Text="首页" OnClick="btnFirstPage_Click"/>
<asp:Button ID="btnPrevious" runat="server" Text="上一页" OnClick="btnPrevious_Click"/>
<asp:Label ID="lblCurrentPage" runat="server" Text="Current"></asp:Label>
/
<asp:Label ID="lblTotalPage" runat="server" Text="Total"></asp:Label>
页
<asp:Button ID="btnNext" runat="server" Text="下一页" OnClick="btnNext_Click"/>
<asp:Button ID="btnLastPage" runat="server" Text="尾页" OnClick="btnLastPage_Click"/>
</div>
</div>ASP.NET后台代码：
using System;
using System.Collections.Generic;
using System.Web.UI;
using Common;
namespace Web
{
public partial class _Default : System.Web.UI.Page
{
private static ListPager lp = null;
private static int currentIndex = 1;
private static int pageSize = 5;
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindRepeater(1, pageSize);
}
}
private void BindRepeater(int index, int pageSize)
{
BLLDemo.NewsBll optNews = new BLLDemo.NewsBll();
List list = optNews.GetModels();
lp = new ListPager(list, index, pageSize);
RptNews.DataSource = lp;
RptNews.DataBind();
BindPagerControls();
}
private void BindPagerControls()
{
// 判断上一页，下一页按钮是否启用.
btnPrevious.Enabled = currentIndex != 1;
btnNext.Enabled = currentIndex != lp.PageCount;
lblCurrentPage.Text = lp.CurrentIndex.ToString();
lblTotalPage.Text = lp.PageCount.ToString();
lblPageInfo.Text = String.Format("共{0}条记录，每页显示{1}条", lp.TotalItem, lp.PageSize);
}
protected void btnPrevious_Click(object sender, EventArgs e)
{
--currentIndex;
BindRepeater(currentIndex, pageSize);
BindPagerControls();
}
protected void btnNext_Click(object sender, EventArgs e)
{
++currentIndex;
BindRepeater(currentIndex, pageSize);
BindPagerControls();
}
protected void btnFirstPage_Click(object sender, EventArgs e)
{
currentIndex = 1; //修正为1，第一次发的时候写成0了，2B了～
BindRepeater(currentIndex, pageSize);
}
protected void btnLastPage_Click(object sender, EventArgs e)
{
currentIndex = lp.PageCount;
BindRepeater(currentIndex, pageSize);
}
}
}
转到[]页功能：
ASPX代码：
<asp:textbox id="txtGotoPage" runat="server" cssclass="textbox" width="30px"></asp:textbox>
<asp:button id="btnGotoPage" runat="server" text="转到" cssclass="aspbtn" onclick="btnGotoPage_Click"></asp:button>C#代码：（WYJ.Web.Utils为我的工具类，可以换成你自己的）
protected void btnGotoPage_Click(object sender, EventArgs e)
{
int pageIndex = 1;
try
{
pageIndex = Convert.ToInt32(txtGotoPage.Text.Trim());
if (pageIndex < 1 || pageIndex > lp.PageCount)
{
throw new Exception("页码范围不正确！");
}
else
{
currentIndex = pageIndex;
ReadData(currentIndex, pageSize);
}
}
catch (InvalidCastException)
{
WYJ.Web.Utils.MessageBox.Show(this, "页码必须是数字。");
}
catch (Exception ex)
{
WYJ.Web.Utils.MessageBox.Show(this, "错误：" + ex.Message);
}
}
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