Insus.NET近段時間應朋友的要求，寫一個GridView多層嵌套和折疊與展開。這個功能的GridView多層嵌套沒有問題，因為已經(jīng)做了無限次數(shù)，但是折疊與展開的功能，卻花上不少時間(網(wǎng)上找資料)，雖找到資料可參考，還是了解明它，并修改適合自己程序使用。效果如下：

站點中多個頁面使用，因此Insus.NET把它寫在一個用戶自定義控件ASCX上。

復制代碼代碼如下:

 
InsusMenu.ascx 

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

<!--折疊與展開的Javascript部分--> 
<script type="text/javascript" language="javascript"> 
function ShowHidde(sid, evt) { 
evt = evt || window.event; 
var target = evt.target || evt.srcElement; 
var objDiv = document.getElementById("div" + sid); 
objDiv.style.display = objDiv.style.display == "none" ? "block" : "none"; 
target.title = objDiv.style.display == "none" ? "Show" : "Hide"; 
var imgid = 'img' + sid; 
document.getElementById(imgid).src = objDiv.style.display == "none" ? "Image/+.gif" : "Image/-.gif"; 
} 
</script> 
<!--第一層--> 
<asp:GridView ID="GridViewYear" runat="server" Width="100%" AutoGenerateColumns="False" 
OnRowDataBound="GridViewYear_RowDataBound" ShowHeader="false" BorderWidth="0"> 
<Columns> 
<asp:TemplateField> 
<ItemStyle BorderWidth="0" Height="25" /> 
<ItemTemplate> 

<!--下在這個綁定Eval("Year")，是為獲取唯一ID，如果你的記錄有一個主鍵的話，可以綁定主鍵的字段名--> 
<img id='img<%# Eval("Year")%>' style="border: 0px;" src="Image/+.gif" onclick="ShowHidde('<%#Eval("Year")%>',event)" /> 

<!--下面這個綁定，是第一層顯示的文字--> 
<%# Eval("Year") & "年"%> 
<div id='div<%# Eval("Year")%>' style="display: none;"> 

<!--第二層--> 
<asp:GridView ID="GridViewMonth" runat="server" OnRowDataBound="GridViewMonth_RowDataBound" Width="100%" AutoGenerateColumns="False" ShowHeader="False" BorderWidth="0"> 
<Columns> 
<asp:TemplateField> 
<ItemStyle BorderWidth="0" Height="25" /> 
<ItemTemplate> 
<!--這部分的解釋，可參考上面。--> 
<img id='img<%# Eval("Month")%>' style="border: 0px; padding-left: 20px;" src="Image/+.gif" onclick="ShowHidde('<%#Eval("Month")%>',event)" /> 
<%# Eval("Month") & "月"%> 
<div id='div<%# Eval("Month")%>' style="display: none;"> 

<!--第三層--> 
<asp:GridView ID="GridViewVideoFile" runat="server" Width="100%" AutoGenerateColumns="False" 
ShowHeader="False" BorderWidth="0"> 
<Columns> 
<asp:TemplateField> 
<ItemStyle BorderWidth="0" Height="25" /> 
<ItemTemplate> 
<img style="border: 0px; padding-left: 40px; padding-right:5px; width: 16px; height: 16px; vertical-align: middle;" src="Image/m_file.png" /><asp:HyperLink ID="HyperLinkPlayer" runat="server" NavigateUrl='<%# "~/VideoPlayer.aspx?videokey=" & Eval("VideoLibrary_nbr")%>' Text='<%# Eval("OldFileName").Substring(0, Eval("OldFileName").LastIndexOf("."))%>' Target="_blank"></asp:HyperLink> 
</ItemTemplate> 
</asp:TemplateField> 
</Columns> 
</asp:GridView> 
</div> 
</ItemTemplate> 
</asp:TemplateField> 
</Columns> 
</asp:GridView> 
</div> 
</ItemTemplate> 
</asp:TemplateField> 
</Columns> 
</asp:GridView> 

復制代碼代碼如下:

 
InsusMenu.ascx.vb 

Imports System.Data 
Imports Insus.NET 

Partial Class AscxControls_InsusMenu 
Inherits System.Web.UI.UserControl 

'宣告實例 
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() 
'從數(shù)據(jù)庫獲取數(shù)據(jù)，綁定在第一層的GridView 
Me.GridViewYear.DataSource = objVideoLibrary.GetYear() 
Me.GridViewYear.DataBind() 
End Sub 

'數(shù)據(jù)綁定在第二層的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 

'數(shù)據(jù)綁定在第三層的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 