ID #34476

ASP.NET程序中用Repeater实现分页

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:

ASP.NET程序中用Repeater实现分页

2005-01-21 00:00
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