三、代碼設(shè)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(shù)據(jù),退出過程 If rowSum = 0 Then Exit Sub '計算出瀏覽數(shù)據(jù)的總頁數(shù) If rowSum Mod rowCount > 0 Then '有余數(shù)要加1 maxPage = rowSum / rowCount + 1 Else '正好除盡 maxPage = rowSum / rowCount End If
currentPage = 1 '調(diào)用綁定數(shù)據(jù)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(chuàng)建一個綁定數(shù)據(jù)的過程 Sub BindData() Repeater1.DataSource = ds Repeater1.DataBind() Label1.Text = currentPage End Sub
'創(chuàng)建一個填充數(shù)據(jù)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
'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(xiàn)在頁是第二頁,設(shè)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(xiàn)在頁倒數(shù)第二頁,設(shè)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(shè)置當(dāng)前頁為最大頁數(shù) currentPage = Label2.Text readpage(currentPage) BindData() Button1.Visible = True Button2.Visible = True Button3.Visible = False Button4.Visible = False End Sub End Class