Språk

MenuItemCollection.Clear Metod

Definition

Tar bort alla objekt från det aktuella MenuItemCollection objektet.

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

Exempel

Följande kodexempel visar hur du använder Clear metoden för att ta bort alla objekt från Items en kontrollsamling Menu .


<%@ 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>

Kommentarer

Clear Använd metoden för att ta bort alla MenuItem objekt från det aktuella MenuItemCollection objektet.

Note

Om du vill ta bort en enskild nod från samlingen bör du överväga att använda Remove metoden eller RemoveAt .

Gäller för

Se även