MenuItem.Depth 屬性
定義
重要
部分資訊涉及發行前產品，在發行之前可能會有大幅修改。 Microsoft 對此處提供的資訊，不做任何明確或隱含的瑕疵擔保。
取得顯示功能表項目的層級。
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屬性值
顯示功能表項目的層級。
- 屬性
範例
下列範例示範如何使用 Depth 屬性來判斷功能表項目的深度。
<%@ 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>
備註
Depth使用 屬性來判斷功能表項目的深度。 深度表示顯示功能表項目的層級，並代表目前功能表項目與根功能表項目之間的階層層級數目。 例如，根功能表項目的深度為 0。 根功能表項目的子功能表項深度為 1，依此類之。