ASP.NET程序中用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:
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