文/waterswea

　　一、程序功能：為Repeater實現分頁

　　二、窗體設計：

　　1、新建asp.net Web應用程序，命名為Repeater2，保存路徑為http://192.168.0.1/Repeater2（注：我機子上的網站的ip是192.168.0.1的主目錄是D:/web文件夾）然后點擊確定。

　　2、向窗體添加一個3行一列的表，向表的第一行中添加一個Repeater控件，向表的第二行中添加兩個Label控件向表的第三行中添加四個Button按鈕。

　　3、切換到HTML代碼窗口，在<asp:Repeater id="Repeater1" runat="server">和</asp:Repeater>之間添加以下代碼：

<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、代碼設計：

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 '記錄著目前在哪一頁上
　Dim maxPage As Integer '總共有多少頁
　Const rowCount As Integer = 3 '一頁有多少行
　Dim rowSum As Integer '總共有多少行

　'窗體代碼省略

　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")
　　　'獲取總共有多少行
　　　rowSum = ds.Tables(0).Rows.Count
　　Catch ex As Exception
　　　rowSum = 0
　　End Try

　　'如果沒有數據，退出過程
　　If rowSum = 0 Then Exit Sub
　　'計算出瀏覽數據的總頁數
　　If rowSum Mod rowCount > 0 Then
　　　'有余數要加1
　　　maxPage = rowSum / rowCount + 1
　　Else
　　　'正好除盡
　　　maxPage = rowSum / rowCount
　　End If

　　currentPage = 1
　　'調用綁定數據過程
　　readpage(currentPage)
　　BindData()
　　Label2.Text = maxPage
　　'首頁和上一頁按鈕不可見
　　Button1.Visible = False
　　Button2.Visible = False
　End If
End Sub

'創建一個綁定數據的過程
Sub BindData()
　Repeater1.DataSource = ds
　Repeater1.DataBind()
　Label1.Text = currentPage
End Sub

'創建一個填充數據集的過程
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

'首頁按鈕
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

　currentPage = 1
　'調用填充數據集過程
　readpage(currentPage)
　'綁定數據
　BindData()
　'設置首頁、第一頁按鈕不可見，顯示下一頁尾頁按鈕
　Button1.Visible = False
　Button2.Visible = False
　Button3.Visible = True
　Button4.Visible = True

End Sub

'上一頁按鈕
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
'如果現在頁是第二頁，設置首頁和上一頁按鈕不可見
　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

'下一頁按鈕
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
'如果現在頁倒數第二頁，設置最后頁和下一頁按鈕不可見
　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

　'尾頁按鈕
　Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
　　'設置當前頁為最大頁數
　　currentPage = Label2.Text
　　readpage(currentPage)
　　BindData()
　　Button1.Visible = True
　　Button2.Visible = True
　　Button3.Visible = False
　　Button4.Visible = False
　End Sub
End Class

　　窗體界面如下所示：