用ASP.NET實現網路空間管理

來源:互聯網
上載者:User
asp.net|網路     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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