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Menu.SelectedItem 属性

  • 参考

定义

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

获取选定的菜单项。

public:
 property System::Web::UI::WebControls::MenuItem ^ SelectedItem { System::Web::UI::WebControls::MenuItem ^ get(); };
[System.ComponentModel.Browsable(false)]
public System.Web.UI.WebControls.MenuItem SelectedItem { get; }
[<System.ComponentModel.Browsable(false)>]
member this.SelectedItem : System.Web.UI.WebControls.MenuItem
Public ReadOnly Property SelectedItem As MenuItem

属性值

MenuItem

表示选定菜单项的 MenuItem。

属性
BrowsableAttribute

示例

下面的代码示例演示如何使用 SelectedItem 属性来确定控件中的 Menu 选定菜单项。


<%@ 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 NavigationMenu_MenuItemClick(Object sender, MenuEventArgs e)
  {
    // Use the SelectedItem property to retrieve the selected
    // menu item.
    MenuItem selectedItem = NavigationMenu.SelectedItem;
    Message.Text = "You selected " + 
      NavigationMenu.SelectedItem.Text + ".";
  }
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>Menu SelectedItem Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>Menu SelectedItem Example</h3>

      <asp:menu id="NavigationMenu"
        staticdisplaylevels="2"
        staticsubmenuindent="10" 
        orientation="Vertical"
        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 SelectedItem property to retrieve the selected
    ' menu item.
    Dim selectedItem As MenuItem = NavigationMenu.SelectedItem
    Message.Text = "You selected " & _
      NavigationMenu.SelectedItem.Text & "."
  
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
  <head runat="server">
    <title>Menu SelectedItem Example</title>
</head>
<body>
    <form id="form1" runat="server">
    
      <h3>Menu SelectedItem Example</h3>

      <asp:menu id="NavigationMenu"
        staticdisplaylevels="2"
        staticsubmenuindent="10" 
        orientation="Vertical"
        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>

注解

SelectedItem使用 属性确定用户选择的菜单项。

注意

作为快捷方式，还可以使用 SelectedValue 属性直接确定所选菜单项的文本。

当用户从 Menu 控件中选择菜单项时， MenuItemClick 将引发 事件，这使你可以通过提供事件处理程序来执行自定义例程。

适用于

另请参阅