asp.net 中Repeater 的方法

asp教程.net 中Repeater 的方法

前台代码:

<asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound">
        <ItemTemplate>
            <div class="nav_title">
                <%#Eval("class") %></div>
            <ul class="nav">
                <asp:Repeater ID="Repeater2" runat="server">
                    <ItemTemplate>
                        <li><a class="<%#Convert.ToInt32(Eval("id"))==sortId?"select":"" %>" href="line.aspx?sort_id=<%#Eval("id") %>"><%#Eval("sort") %></a></li>
                    </ItemTemplate>
                </asp:Repeater>
            </ul>
        </ItemTemplate>
    </asp:Repeater>
后台代码(Repeater就不写了,直接第二个):

protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e) {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem) {
            Repeater rptProduct = (Repeater)e.Item.FindControl("Repeater2");
            //找到分类Repeater关联的数据项
            DataRowView rowv = (DataRowView)e.Item.DataItem;
            //提取分类ID
            string classKey = rowv["class"].ToString();
            //根据分类ID查询该分类下的产品，并绑定产品Repeater
            DataSet st = AccessHelper.ExecuteDataSet("select distinct [sort],[id] from [line_sort] where [class]=@class",AccessHelper.Parameter("@class",classKey));
            rptProduct.DataSource = st.Tables[0];
            rptProduct.DataBind();
        }
    }

　一、程序功能：为Repeater实现分页

　　二、窗体设计：

　　1、新建视频教程'>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