关于ASP.NET List泛型分页实例

作者：袖梨 2022-06-25

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：

代码如下 复制代码

public class ListPager : List{
private int _CurrentIndex;
private int _PageSize;
private int _TotalItem;
private int _PageCount;

public int CurrentIndex
{
get { return _CurrentIndex; }
set { _CurrentIndex = value; }
}

public int PageSize
{
get { return _PageSize; }
set { _PageSize = value; }
}

public int TotalItem
{
get { return _TotalItem; }
set { _TotalItem = value; }
}

public int PageCount
{
get { return _PageCount; }
set { _PageCount = value; }
}

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 {
this.Add(list[i]);
}

this._TotalItem = list.Count;
this._PageCount = (this._TotalItem / PageSize) + 1;
}
}

测试用Model和模拟的Bll：

代码如下 复制代码

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; }
}
}

ASP.NET页面代码（部分）：

代码如下 复制代码


ASP.NET泛型分页




Repeater控件分页Demo



    asp:Repeater ID="RptNews" runat="server">


  • ,
    ,
    ,









/

页

ASP.NET后台代码：

代码如下 复制代码

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);
}
}
}

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