MenuItemCollection.Count 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。
取得目前 MenuItemCollection 物件中所包含的功能表項目數。
public:
property int Count { int get(); };public int Count { get; }member this.Count : intPublic ReadOnly Property Count As Integer屬性值
目前 MenuItemCollection 物件中所包含的功能表項目數。
實作
範例
下列程式碼範例示範如何使用 Count 屬性來判斷 物件中的 MenuItemCollection 功能表項目數目。
<%@ 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 NavigationMenu_MenuItemClick(Object sender, MenuEventArgs e)
{
// Use the Count property to determine the number of submenu
// items contained in the selected menu item.
Message.Text = "The " + e.Item.Text + " menu item contains " +
e.Item.ChildItems.Count.ToString() + " submenu items.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MenuItemCollection Count Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuItemCollection Count Example</h3>
Select an item from the menu.
<br/><br/>
<asp:menu id="NavigationMenu"
orientation="Vertical"
target="_blank"
onmenuitemclick="NavigationMenu_MenuItemClick"
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/>
<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 NavigationMenu_MenuItemClick(ByVal sender As Object, ByVal e As MenuEventArgs)
' Use the Count property to determine the number of submenu
' items contained in the selected menu item.
Message.Text = "The " & e.Item.Text & " menu item contains " & _
e.Item.ChildItems.Count.ToString & " submenu items."
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>MenuItemCollection Count Example</title>
</head>
<body>
<form id="form1" runat="server">
<h3>MenuItemCollection Count Example</h3>
Select an item from the menu.
<br/><br/>
<asp:menu id="NavigationMenu"
orientation="Vertical"
target="_blank"
onmenuitemclick="NavigationMenu_MenuItemClick"
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/>
<asp:label id="Message"
runat="server"/>
</form>
</body>
</html>
備註
Count使用 屬性來判斷 物件中的 MenuItemCollection 專案數目。 在逐一查看集合以判斷集合的上限時，通常會使用這個屬性。 屬性 Count 也常用來判斷集合是否為空白。