GridView多层嵌套和折叠与展开(修改适合自己使用)

Insus.NET近段时间应朋友的要求，写一个GridView多层嵌套和折叠与展开。这个功能的GridView多层嵌套没有问题，因为已经做了无限次数，但是折叠与展开的功能，却花上不少时间(网上找资料)，虽找到资料可参考，还是了解明它，并修改适合自己程序使用。效果如下：

站点中多个页面使用，因此Insus.NET把它写在一个用户自定义控件ASCX上。
复制代码 代码如下:
InsusMenu.ascx

<%@ Control Language="VB" AutoEventWireup="false" CodeFile="InsusMenu.ascx.vb" Inherits="AscxControls_InsusMenu" %>




onRowDataBound="GridViewYear_RowDataBound" ShowHeader="false" BorderWidth="0">






' style="border: 0px;" src="Image/+.gif" onclick="ShowHidde('<%#eval("Year")%>',event)" />


<%# eval("Year") & "年"%>
' style="display: none;">








' style="border: 0px; padding-left: 20px;" src="Image/+.gif" onclick="ShowHidde('<%#eval("Month")%>',event)" />
<%# eval("Month") & "月"%>
' style="display: none;">


ShowHeader="False" BorderWidth="0">




' Text='<%# eval("OldFileName").Substring(0, eval("OldFileName").LastIndexOf("."))%>' Target="_blank">















复制代码 代码如下:
InsusMenu.ascx.vb

imports System.Data
imports Insus.NET

Partial Class AscxControls_InsusMenu
Inherits System.Web.UI.UserControl

'宣告实例
Dim objVideoLibrary As New VideoLibrary()

Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
If Not IsPostBack Then
Data_Binding()
End If
End Sub

Private Sub Data_Binding()
'从数据库获取数据，绑定在第一层的GridView
Me.GridViewYear.DataSource = objVideoLibrary.GetYear()
Me.GridViewYear.DataBind()
End Sub

'数据绑定在第二层的GridView
Protected Sub GridViewYear_RowDataBound(sender As Object, e As GridViewRowEventArgs)


Dim dvr As DataRowView = DirectCast(e.Row.DataItem, DataRowView)
If e.Row.RowType = DataControlRowType.DataRow Then
If e.Row.FindControl("GridViewMonth") IsNot Nothing Then
Dim Gv As GridView = DirectCast(e.Row.FindControl("GridViewMonth"), GridView)
objVideoLibrary.Year = ConvertData.ToSmallInt(dvr("Year"))
Gv.DataSource = objVideoLibrary.GetMonthByYear()
Gv.DataBind()
End If
End If
End Sub

'数据绑定在第三层的GridView
Protected Sub GridViewMonth_RowDataBound(sender As Object, e As GridViewRowEventArgs)
Dim dvr As DataRowView = DirectCast(e.Row.DataItem, DataRowView)
If e.Row.RowType = DataControlRowType.DataRow Then
If e.Row.FindControl("GridViewVideoFile") IsNot Nothing Then
Dim Gv As GridView = DirectCast(e.Row.FindControl("GridViewVideoFile"), GridView)
objVideoLibrary.Year = ConvertData.ToSmallInt(dvr("Year"))
objVideoLibrary.Month = ConvertData.ToTinyInt(dvr("Month"))
Gv.DataSource = objVideoLibrary.GetByYearAndMonth()
Gv.DataBind()
End If
End If
End Sub
End Class