ASP.NET程序中用Repeater实现分页

 更新时间:2006年10月11日 00:00:00   作者:   我要评论
一、程序功能:
  为Repeater实现分页
  
  二、窗体设计:
  1、新建ASP.NET Web应用程序,命名为Repeater2,保存路径为http://192.168.0.1/Repeater2(注:我机子上的网站的IP是192.168.0.1的主目录是D:\web文件夹)然后点击确定。
  
  2、向窗体添加一个3行一列的表,向表的第一行中添加一个Repeater控件,向表的第二行中添加两个Label控件向表的第三行中添加四个Button按钮。
  
  3、切换到HTML代码窗口,在<asp:Repeater id="Repeater1" runat="server">和</asp:Repeater>之间添加以下代码:
  
  <ItemTemplate>
  <table id="Table2" style="FONT-SIZE: x-small" width="498">
  <tr>
  <td><%#DataBinder.Eval(Container,"DataItem.employeeid")%></td>
  <td><%#DataBinder.Eval(Container,"DataItem.lastname")%></td>
  </tr>
  </table>
  </ItemTemplate>
  
  三、代码设计:
  Imports System.Data.SqlClient
  Public Class WebForm1
  Inherits System.Web.UI.Page
  
  Dim scon As New SqlConnection("server=localhost;database=northwind;uid=sa;pwd=123")
  Dim sDA As SqlDataAdapter
  Dim ds As DataSet
  Dim currentPage As Integer '记录着目前在哪一页上
  Dim maxPage As Integer '总共有多少页
  Const rowCount As Integer = 3 '一页有多少行
  Dim rowSum As Integer '总共有多少行
  
  '窗体代码省略
  
  Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
  
  If Not Page.IsPostBack Then
  sDA = New SqlDataAdapter("select employeeid, lastname from employees order by employeeid", scon)
  ds = New DataSet
  Try
  sDA.Fill(ds, "employees")
  '获取总共有多少行
  rowSum = ds.Tables(0).Rows.Count
  Catch ex As Exception
  rowSum = 0
  End Try
  
  '如果没有数据,退出过程
  If rowSum = 0 Then Exit Sub
  '计算出浏览数据的总页数
  If rowSum Mod rowCount > 0 Then
  '有余数要加1
  maxPage = rowSum \ rowCount + 1
  Else
  '正好除尽
  maxPage = rowSum \ rowCount
  End If
  
  currentPage = 1
  '调用绑定数据过程
  readpage(currentPage)
  BindData()
  Label2.Text = maxPage
  '首页和上一页按钮不可见
  Button1.Visible = False
  Button2.Visible = False
  End If
  End Sub
  
  '创建一个绑定数据的过程
  Sub BindData()
  Repeater1.DataSource = ds
  Repeater1.DataBind()
  Label1.Text = currentPage
  End Sub
  
  '创建一个填充数据集的过程
  Sub readpage(ByVal n As Integer)
  sDA = New SqlDataAdapter("select employeeid, lastname from employees order by employeeid", scon)
  ds = New DataSet
  ds.Clear()
  sDA.Fill(ds, (n - 1) * rowCount, rowCount, "employees")
  End Sub
  
  '首页按钮
  Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
  
  currentPage = 1
  '调用填充数据集过程
  readpage(currentPage)
  '绑定数据
  BindData()
  '设置首页、第一页按钮不可见,显示下一页尾页按钮
  Button1.Visible = False
  Button2.Visible = False
  Button3.Visible = True
  Button4.Visible = True
  
  End Sub
  
  '上一页按钮
  Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
  '如果现在页是第二页,设置首页和上一页按钮不可见
  If Label1.Text > 2 Then
  Button3.Visible = True
  Button4.Visible = True
  Else
  Button1.Visible = False
  Button2.Visible = False
  Button3.Visible = True
  Button4.Visible = True
  End If
  currentPage = Label1.Text - 1
  readpage(currentPage)
  BindData()
  End Sub
  
  '下一页按钮
  Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
  '如果现在页倒数第二页,设置最后页和下一页按钮不可见
  If Label1.Text < Label2.Text - 1 Then
  Button1.Visible = True
  Button2.Visible = True
  Else
  Button1.Visible = True
  Button2.Visible = True
  Button3.Visible = False
  Button4.Visible = False
  End If
  currentPage = Label1.Text + 1
  readpage(currentPage)
  BindData()
  End Sub
  
  '尾页按钮
  Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
  '设置当前页为最大页数
  currentPage = Label2.Text
  readpage(currentPage)
  BindData()
  Button1.Visible = True
  Button2.Visible = True
  Button3.Visible = False
  Button4.Visible = False
  End Sub
  End Class
  
  窗体界面如下所示:
  

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