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MenuItem.Depth Eigenschaft

Definition

Ruft die Ebene ab, auf der ein Menüelement angezeigt wird.

public:
 property int Depth { int get(); };
[System.ComponentModel.Browsable(false)]
public int Depth { get; }
[<System.ComponentModel.Browsable(false)>]
member this.Depth : int
Public ReadOnly Property Depth As Integer

Eigenschaftswert

Int32

Die Ebene, auf der ein Menüelement angezeigt wird.

Attribute

Beispiele

Im folgenden Beispiel wird veranschaulicht, wie Sie die Depth Eigenschaft verwenden, um die Tiefe eines Menüelements zu bestimmen.


<%@ 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>

Hinweise

Verwenden Sie die Depth Eigenschaft, um die Tiefe des Menüelements zu bestimmen. Die Tiefe gibt die Ebene an, auf der ein Menüelement angezeigt wird und die Anzahl der Hierarchieebenen zwischen dem aktuellen Menüelement und dem Stammmenüelement darstellt. Beispielsweise verfügt ein Stammmenüelement über eine Tiefe von 0. Ein Untermenüelement des Stammmenüelements verfügt über eine Tiefe von 1 und so weiter.

Gilt für

Siehe auch