|
|
一、程序功能：为Repeater实现分页
二、窗体设计：
1、新建ASP.NET Web应用程序，命名为Repeater2，保存路径为http://192.168.0.1/Repeater2（注：我机子上的网站的IP是192.168.0.1的主目录是D:\web文件夹）然后点击确定。
2、向窗体添加一个3行一列的表，向表的第一行中添加一个Repeater控件，向表的第二行中添加两个Label控件向表的第三行中添加四个Button按钮。
3、切换到HTML代码窗口，在＜asp:Repeater id="Repeater1" runat="server"＞和＜/asp:Repeater＞之间添加以下代码：
＜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、代码设计：
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 '记录着目前在哪一页上
Dim maxPage As Integer '总共有多少页
Const rowCount As Integer = 3 '一页有多少行
Dim rowSum As Integer '总共有多少行
'窗体代码省略
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")
'获取总共有多少行
rowSum = ds.Tables(0).Rows.Count
Catch ex As Exception
rowSum = 0
End Try
'如果没有数据，退出过程
If rowSum = 0 Then Exit Sub
'计算出浏览数据的总页数
If rowSum Mod rowCount ＞ 0 Then
'有余数要加1
maxPage = rowSum \ rowCount + 1
Else
'正好除尽
maxPage = rowSum \ rowCount
End If
currentPage = 1
'调用绑定数据过程
readpage(currentPage)
BindData()
Label2.Text = maxPage
'首页和上一页按钮不可见
Button1.Visible = False
Button2.Visible = False
End If
End Sub
'创建一个绑定数据的过程
Sub BindData()
Repeater1.DataSource = ds
Repeater1.DataBind()
Label1.Text = currentPage
End Sub
'创建一个填充数据集的过程
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
'首页按钮
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
currentPage = 1
'调用填充数据集过程
readpage(currentPage)
'绑定数据
BindData()
'设置首页、第一页按钮不可见，显示下一页尾页按钮
Button1.Visible = False
Button2.Visible = False
Button3.Visible = True
Button4.Visible = True
End Sub
'上一页按钮
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
'如果现在页是第二页，设置首页和上一页按钮不可见
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
'下一页按钮
Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
'如果现在页倒数第二页，设置最后页和下一页按钮不可见
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
'尾页按钮
Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
'设置当前页为最大页数
currentPage = Label2.Text
readpage(currentPage)
BindData()
Button1.Visible = True
Button2.Visible = True
Button3.Visible = False
Button4.Visible = False
End Sub
End Class |
窗体界面如下所示：
|
|
