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MenuItemCollection.AddAt(Int32, MenuItem) 方法

  • 参考

定义

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

将指定的 MenuItem 对象插入到当前 MenuItemCollection 对象的指定索引位置。

public:
 void AddAt(int index, System::Web::UI::WebControls::MenuItem ^ child);
public void AddAt (int index, System.Web.UI.WebControls.MenuItem child);
member this.AddAt : int * System.Web.UI.WebControls.MenuItem -> unit
Public Sub AddAt (index As Integer, child As MenuItem)

参数

index
Int32

要插入 MenuItem 对象的从零开始的索引位置。

child
MenuItem

要插入的 MenuItem。

示例

下面的代码示例演示如何使用 AddAt 方法以编程方式将 MenuItemCollection 对象插入MenuItem到指定索引位置的 对象中。


<%@ 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)
    {
      // Retrieve the root menu item from the Items
      // collection of the Menu control.
      MenuItem homeMenuItem = NavigationMenu.Items[0];

      // Create the submenu item.
      MenuItem newSubMenuItem = new MenuItem("New Category");

      // Insert the submenu item in the ChildItems
      // collection of the root menu item at index 0.
      homeMenuItem.ChildItems.AddAt(0, newSubMenuItem);
    }
  }

</script>

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

    </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

      ' Retrieve the root menu item from the Items
      ' collection of the Menu control.
      Dim homeMenuItem As MenuItem = NavigationMenu.Items(0)

      ' Create the submenu item.
      Dim newSubMenuItem = New MenuItem("New Category")

      ' Insert the submenu item in the ChildItems
      ' collection of the root menu item at index 0.
      homeMenuItem.ChildItems.AddAt(0, newSubMenuItem)
    
    End If
      
  End Sub

</script>

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

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

注解

AddAt使用 方法将指定MenuItem对象插入集合中的指定索引处。

注意

可以将 null 值和重复 MenuItem 对象添加到集合中。

作为替代方法，只需使用 Add 方法将 对象追加MenuItem到集合的末尾。

适用于

另请参阅