通过

MenuItemCollection.Clear 方法

  • 参考

定义

命名空间:
System.Web.UI.WebControls
程序集:
System.Web.dll

从当前 MenuItemCollection 对象中移除所有项。

public:
 void Clear();
public void Clear ();
member this.Clear : unit -> unit
Public Sub Clear ()

示例

下面的代码示例演示如何使用 Clear 方法从 Items 控件的 Menu 集合中删除所有项。


<%@ 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 (!IsPostBack)
    {
      // Use the Clear method to remove all 
      // menu items from the Items collection
      // of the Menu control.
      NavigationMenu.Items.Clear();

      // Create the menu structure.

      // Create the root menu item.
      MenuItem homeMenuItem = new MenuItem("Home");

      // Create the submenu items.
      MenuItem musicSubMenuItem = new MenuItem("Music");
      MenuItem moviesSubMenuItem = new MenuItem("Movies");

      // Add the submenu items to the ChildItems
      // collection of the root menu item.
      homeMenuItem.ChildItems.Add(musicSubMenuItem);
      homeMenuItem.ChildItems.Add(moviesSubMenuItem);

      // Add the root menu item to the Items collection 
      // of the Menu control.
      NavigationMenu.Items.Add(homeMenuItem);
    }
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>MenuItemCollection Clear Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>MenuItemCollection Clear Example</h3>
    
      <asp:menu id="NavigationMenu"
        orientation="Vertical"
        target="_blank" 
        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 Not IsPostBack Then
    
      ' Use the Clear method to remove all 
      ' menu items from the Items collection
      ' of the Menu control.
      NavigationMenu.Items.Clear()
      
      ' Create the menu structure.

      ' Create the root menu item.
      Dim homeMenuItem As New MenuItem("Home")

      ' Create the submenu items.
      Dim musicSubMenuItem As New MenuItem("Music")
      Dim moviesSubMenuItem As New MenuItem("Movies")

      ' Add the submenu items to the ChildItems
      ' collection of the root menu item.
      homeMenuItem.ChildItems.Add(musicSubMenuItem)
      homeMenuItem.ChildItems.Add(moviesSubMenuItem)

      ' Add the root menu item to the Items collection 
      ' of the Menu control.
      NavigationMenu.Items.Add(homeMenuItem)
      
    End If
  
  End Sub

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>MenuItemCollection Clear Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>MenuItemCollection Clear Example</h3>
    
      <asp:menu id="NavigationMenu"
        orientation="Vertical"
        target="_blank" 
        runat="server"/>

    </form>
  </body>
</html>

注解

Clear使用 方法从当前MenuItemCollection对象中删除每个MenuItem对象。

注意

若要从集合中删除单个节点，请考虑使用 Remove 或 RemoveAt 方法。

适用于

另请参阅