ASP.NET 数字索引分页

时间：2010-09-08 来源：Simcoder

效果：
共1页首页上一页 1 2 3 4 5 6 7 8 9 10 ....下一页末页
调用页面（Aspx）：

1.在要显示分页导航的地方加个DIV标签：

2.调用页的代码（CS）： DataList1.DataSource = ds.Tables[0].DefaultView;
DataList1.DataBind();
this.PageInfo.InnerHtml = PageNums.GetPageNum(ds,DataList1,12); //传入DataSet,DataList名称和分页大小

3.PageNums实现分页类（PageNums.cs）：

(c#)

代码 using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
/// <summary>
///PageNums 的摘要说明
/// </summary>
public class PageNums
{
    /// </summary>
    /// <param name="ds">DataSet实例</param>
    /// <param name="datalistname">DataList名称</param>
    /// <param name="pagesize">分页大小</param>
    public static string GetPageNum(DataSet ds, DataList datalistname, int pagesize)
    {
        PagedDataSource objPds = new PagedDataSource();
        objPds.DataSource = ds.Tables[0].DefaultView;
        objPds.AllowPaging = true;
        int total = ds.Tables[0].Rows.Count;
        objPds.PageSize = pagesize;
        int page;
        if (HttpContext.Current.Request.QueryString["page"] != null)
            page = Convert.ToInt32(HttpContext.Current.Request.QueryString["page"]);
        else
            page = 1;
        objPds.CurrentPageIndex = page - 1;
        datalistname.DataSource = objPds;
        datalistname.DataBind();
        int allpage = 0;
        int next = 0;
        int pre = 0;
        int startcount = 0;
        int endcount = 0;
        string pagestr = "";
        if (page < 1) { page = 1; }
        //计算总页数
        if (pagesize != 0)
        {
            allpage = (total / pagesize);
            allpage = ((total % pagesize) != 0 ? allpage + 1 : allpage);
            allpage = (allpage == 0 ? 1 : allpage);
        }
        next = page + 1;
        pre = page - 1;
        startcount = (page + 5) > allpage ? allpage - 9 : page - 4;//中间页起始序号
        //中间页终止序号
        endcount = page < 5 ? 10 : page + 5;
        if (startcount < 1) { startcount = 1; } //为了避免输出的时候产生负数，设置如果小于1就从序号1开始
        if (allpage < endcount) { endcount = allpage; } //页码+5的可能性就会产生最终输出序号大于总页码，那么就要将其控制在页码数之内
        pagestr = "共" + allpage + "页      ";
        pagestr += page > 1 ? "<a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=1\">首页</a>  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + pre + "\">上一页</a>" : "首页上一页";
       //中间页处理，这个增加时间复杂度，减小空间复杂度
        for (int i = startcount; i <= endcount; i++)
        {
            pagestr += page == i ? "  <font color=\"#ff0000\">" + i + "</font>" : "  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + i + "\">" + i + "</a>";
        }
        pagestr += page != allpage ? "  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + next + "\">下一页</a>  <a href=\"" + HttpContext.Current.Request.CurrentExecutionFilePath + "?page=" + allpage + "\">末页</a>" : " 下一页末页";
        return pagestr;
    }
}

(VB)

代码 Imports System
Imports System.Data
Imports System.Configuration
Imports System.Web
Imports System.Web.Security
Imports System.Web.UI
Imports System.Web.UI.HtmlControls
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.WebParts
Imports Microsoft.VisualBasic

Public Class PageNums
    ''' </summary>
    ''' <param name="ds">DataSet实例</param>
    ''' <param name="datalistname">DataList名称</param>
    ''' <param name="pagesize">分页大小</param>
    Public Shared Function GetPageNum(ByVal ds As DataSet, ByVal datalistname As DataList, ByVal pagesize As Integer) As String
        Dim objPds As New PagedDataSource()
        objPds.DataSource = ds.Tables(0).DefaultView
        objPds.AllowPaging = True
        Dim total As Integer = ds.Tables(0).Rows.Count
        objPds.PageSize = pagesize
        Dim page As Integer
        If HttpContext.Current.Request.QueryString("page") IsNot Nothing Then
            page = Convert.ToInt32(HttpContext.Current.Request.QueryString("page"))
        Else
            page = 1
        End If
        objPds.CurrentPageIndex = page - 1
        datalistname.DataSource = objPds
        datalistname.DataBind()
        Dim allpage As Integer = 0
        Dim [next] As Integer = 0
        Dim pre As Integer = 0
        Dim startcount As Integer = 0
        Dim endcount As Integer = 0
        Dim pagestr As String = ""
        If page < 1 Then
            page = 1
        End If
        '计算总页数
        If pagesize <> 0 Then
            allpage = (total / pagesize)
            If (total Mod pagesize) <> 0 Then
                allpage = allpage + 1
            Else
                allpage = allpage
            End If
            If allpage = 0 Then
                allpage = 1
            Else
                allpage = allpage
            End If

        End If
        [next] = page + 1
        pre = page - 1
        If (page + 5) > allpage Then
            startcount = allpage - 9
        Else
            startcount = page - 4
        End If

        '中间页起始序号
        '中间页终止序号
        If page < 5 Then
            endcount = 10
        Else
            endcount = page + 5
        End If

        If startcount < 1 Then
            startcount = 1
        End If
        '为了避免输出的时候产生负数，设置如果小于1就从序号1开始
        If allpage < endcount Then
            endcount = allpage
        End If
        '页码+5的可能性就会产生最终输出序号大于总页码，那么就要将其控制在页码数之内
        pagestr = "共" & allpage & "页      "
        If page > 1 Then
            pagestr += "<a href=""" & HttpContext.Current.Request.CurrentExecutionFilePath & "?page=1"">首页</a>  <a href=""" & HttpContext.Current.Request.CurrentExecutionFilePath & "?page=" & pre & """>上一页</a>"
        Else
            pagestr += "首页上一页"
        End If

        '中间页处理，这个增加时间复杂度，减小空间复杂度
        For i As Integer = startcount To endcount
            If page = i Then
                pagestr += "  <font color=""#ff0000"">" & i & "</font>"
            Else
                pagestr += "  <a href=""" & HttpContext.Current.Request.CurrentExecutionFilePath & "?page=" & i & """>" & i & "</a>"
            End If

        Next

        If page <> allpage Then
            pagestr += "  <a href=""" & HttpContext.Current.Request.CurrentExecutionFilePath & "?page=" & [next] & """>下一页</a>  <a href=""" & HttpContext.Current.Request.CurrentExecutionFilePath & "?page=" & allpage & """>末页</a>"
        Else
            pagestr += " 下一页末页"
        End If
        Return pagestr
    End Function
End Class