ASP.NET程式中用Repeater實現分頁

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asp.net|程式|分頁 一、程式功能:為Repeater實現分頁

  二、表單設計:

  1、建立ASP.NET Web應用程式,命名為Repeater2,儲存路徑為http://192.168.0.1/Repeater2(註:我機子上的網站的IP是192.168.0.1的主目錄是D:\web檔案夾)然後點擊確定。

  2、向表單添加一個3行一列的表,向表的第一行中添加一個Repeater控制項,向表的第二行中添加兩個Label控制項向表的第三行中添加四個Button按鈕。

  3、切換到HTML代碼視窗,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

 '表單代碼省略

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

  '如果沒有資料,退出過程
  If rowSum = 0 Then Exit Sub
  '計算出瀏覽資料的總頁數
  If rowSum Mod rowCount > 0 Then
   '有餘數要加1
   maxPage = rowSum \ rowCount + 1
  Else
   '正好除盡
   maxPage = rowSum \ rowCount
  End If

  currentPage = 1
  '調用綁定資料過程
  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

'建立一個綁定資料的過程
Sub BindData()
 Repeater1.DataSource = ds
 Repeater1.DataBind()
 Label1.Text = currentPage
End Sub

'建立一個填充資料集的過程
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
 '調用填充資料集過程
 readpage(currentPage)
 '綁定資料
 BindData()
 '設定首頁、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,設定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,設定最後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
  '設定當前頁為最大頁數
  currentPage = Label2.Text
  readpage(currentPage)
  BindData()
  Button1.Visible = True
  Button2.Visible = True
  Button3.Visible = False
  Button4.Visible = False
 End Sub
End Class
  表單介面如下所示:



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