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ASP.NET程序中用Repeater实现分页

2008-09-03 23:14 543 查看
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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