MenuItem.Depth 属性
定义
重要
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获取菜单项的显示级别。
public:
property int Depth { int get(); };[System.ComponentModel.Browsable(false)]
public int Depth { get; }[<System.ComponentModel.Browsable(false)>]
member this.Depth : intPublic ReadOnly Property Depth As Integer属性值
菜单项的显示级别。
- 属性
示例
以下示例演示如何使用 Depth 属性来确定菜单项的深度。
<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
// If the Menu control contains any root nodes, perform a
// preorder traversal of the tree and display the text of
// nodes with a depth of 2.
if (NavigationMenu.Items.Count > 0)
{
// Iterate through the root menu items in the Items collection.
foreach (MenuItem item in NavigationMenu.Items)
{
DisplayChildMenuText(item);
}
}
else
{
Message.Text = "The Menu control does not have any items.";
}
}
void DisplayChildMenuText(MenuItem item)
{
// Use the Depth property to determine the depth of a
// menu item. Display only items with a depth of 2.
if (item.Depth == 2)
{
Message.Text += item.Text + "<br />";
}
// Iterate through the child menu items of the parent menu item
// passed into this method, and display their values.
foreach (MenuItem childItem in item.ChildItems)
{
// Recursively call the DisplayChildMenuText method to
// traverse the tree.
DisplayChildMenuText(childItem);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MenuItem Depth Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuItem Depth Example</h3>
<asp:menu id="NavigationMenu"
staticdisplaylevels="2"
staticsubmenuindent="10"
orientation="Vertical"
runat="server">
<items>
<asp:menuitem text="Home"
tooltip="Home">
<asp:menuitem text="Music"
tooltip="Music">
<asp:menuitem text="Classical"
tooltip="Classical"/>
<asp:menuitem text="Rock"
tooltip="Rock"/>
<asp:menuitem text="Jazz"
tooltip="Jazz"/>
</asp:menuitem>
<asp:menuitem text="Movies"
tooltip="Movies">
<asp:menuitem text="Action"
tooltip="Action"/>
<asp:menuitem text="Drama"
tooltip="Drama"/>
<asp:menuitem text="Musical"
tooltip="Musical"/>
</asp:menuitem>
</asp:menuitem>
</items>
</asp:menu>
<hr/>
Menu items with a depth of 2:<br/><br/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
<%@ Page Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
' If the Menu control contains any root menu items, perform a
' preorder traversal of the tree and display the text of
' menu items with a depth of 2.
If NavigationMenu.Items.Count > 0 Then
' Iterate through the root menu items in the Items collection.
Dim item As MenuItem
For Each item In NavigationMenu.Items
DisplayChildMenuText(item)
Next
Else
Message.Text = "The Menu control does not have any items."
End If
End Sub
Sub DisplayChildMenuText(ByVal item As MenuItem)
' Use the Depth property to determine the depth of a
' menu item. Display only items with a depth of 2.
If item.Depth = 2 Then
Message.Text += item.Text + "<br />"
End If
' Iterate through the child menu items of the parent menu item
' passed into this method, and display their values.
Dim childItem As MenuItem
For Each childItem In item.ChildItems
' Recursively call the DisplayChildMenuText method to
' traverse the tree.
DisplayChildMenuText(childItem)
Next
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MenuItem Depth Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuItem Depth Example</h3>
<asp:menu id="NavigationMenu"
staticdisplaylevels="2"
staticsubmenuindent="10"
orientation="Vertical"
runat="server">
<items>
<asp:menuitem text="Home"
tooltip="Home">
<asp:menuitem text="Music"
tooltip="Music">
<asp:menuitem text="Classical"
tooltip="Classical"/>
<asp:menuitem text="Rock"
tooltip="Rock"/>
<asp:menuitem text="Jazz"
tooltip="Jazz"/>
</asp:menuitem>
<asp:menuitem text="Movies"
tooltip="Movies">
<asp:menuitem text="Action"
tooltip="Action"/>
<asp:menuitem text="Drama"
tooltip="Drama"/>
<asp:menuitem text="Musical"
tooltip="Musical"/>
</asp:menuitem>
</asp:menuitem>
</items>
</asp:menu>
<hr/>
Menu items with a depth of 2:<br/><br/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
注解
使用 Depth 属性确定菜单项的深度。 深度指示显示菜单项的级别，并表示当前菜单项与根菜单项之间的层次结构级别数。 例如，根菜单项的深度为 0。 根菜单项的子菜单项深度为 1，依此而行。