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 程式師世界 >> 編程語言 >> .NET網頁編程 >> ASP.NET >> ASP.NET基礎 >> ASP.NET程序中用Repeater實現分頁

ASP.NET程序中用Repeater實現分頁

編輯:ASP.NET基礎
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)然後點擊確定。
  
  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
  '計算出浏覽數據的總頁數
  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:
  
  1. 上一頁:
  2. 下一頁:
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