如何：使用 Smartphone 菜单
更新：2007 年 11 月
为了符合 Smartphone 用户界面，.NET Compact Framework 强制以下菜单限制：
只能有两个顶级菜单项。
只有位于窗体右侧的第二个顶级菜单项才能有子菜单。
注意，.NET Compact Framework 在设计时并不强制这些限制，但是如果您的代码不遵循这些限制，则在运行时会引发 NotSupportedException。
在运行时，不能删除顶级菜单项。然而，可以将 MenuItem 的 Enabled 属性设置为空字符串 ("") 以使菜单项不可见。
在您创建 Smartphone 和 Pocket PC 应用程序时，Visual Studio 自动向窗体添加 MainMenu 组件，但不会向子窗体添加该组件。MainMenu 组件操作 Smartphone 软键，但是您无法对这些键的功能进行编程，除非您从窗体中移除 MainMenu 组件。有关进行软键编程的更多信息，请参见“使用 Smartphone 后退键和软键”。
若要使一个方法与一个菜单选择相关联，请提供 MenuItem 的 Click 事件的代码。
示例
此示例为一个选择映射的方案定义一个菜单系统：
左边为 Map Help 菜单项，该菜单项具有显示一个消息框的事件处理代码。
右边是 Maps 菜单项，该菜单项具有两个子菜单项：My Maps 和 Add and Remove。这两个子菜单项分别有五个和两个自己的子菜单项。
Imports System
Imports System.Windows.Forms
Public Class Form1
Inherits System.Windows.Forms.Form
Friend WithEvents MainMenu1 As System.Windows.Forms.MainMenu
Private WithEvents mi1 As New MenuItem
Private mi2 As New MenuItem
Private miChildA As New MenuItem
Private miChildB As New MenuItem
Private WithEvents miGrandChildA1 As New MenuItem
Private WithEvents miGrandChildA2 As New MenuItem
Private WithEvents miGrandChildA3 As New MenuItem
Private WithEvents miGrandChildA4 As New MenuItem
Private WithEvents miGrandChildA5 As New MenuItem
Private WithEvents miGrandChildB1 As New MenuItem
Private WithEvents miGrandChildB2 As New MenuItem
Public Sub New()
MyBase.New()
InitializeComponent()
'Define and add menu items.
MainMenu1.MenuItems.Add(mi1)
MainMenu1.MenuItems.Add(mi2)
mi2.MenuItems.Add(miChildA)
mi2.MenuItems.Add(miChildB)
miChildA.MenuItems.Add(miGrandChildA1)
miChildA.MenuItems.Add(miGrandChildA2)
miChildA.MenuItems.Add(miGrandChildA3)
miChildA.MenuItems.Add(miGrandChildA4)
miChildA.MenuItems.Add(miGrandChildA5)
miChildB.MenuItems.Add(miGrandChildB1)
miChildB.MenuItems.Add(miGrandChildB2)
mi1.Text = "Map Help"
mi2.Text = "Maps"
miChildA.Text = "My Maps"
miChildB.Text = "Add and remove"
miGrandChildA1.Text = "Manhattan"
miGrandChildA2.Text = "Bronx"
miGrandChildA3.Text = "Brooklyn"
miGrandChildA4.Text = "Queens"
miGrandChildA5.Text = "Staten Island"
miGrandChildB1.Text = "Add map"
miGrandChildB2.Text = "Delete map"
End Sub
Public Shared Sub Main()
Application.Run(New Form1)
End Sub
'Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
MyBase.Dispose(disposing)
End Sub
Private Sub InitializeComponent()
Me.MainMenu1 = New System.Windows.Forms.MainMenu()
Me.Menu = Me.MainMenu1
Me.Text = "Form1"
End Sub
' The following subroutine handles the
' Click event for the mi1 MenuItem.
Private Sub mi1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mi1.Click
MessageBox.Show("This is just a test.")
End Sub
End Class
using System;
using System.Windows.Forms;
namespace SmartphoneMenus
{
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.MainMenu mainMenu1;
private MenuItem mi1 = new MenuItem();
private MenuItem mi2 = new MenuItem();
private MenuItem miChildA = new MenuItem();
private MenuItem miChildB = new MenuItem();
private MenuItem miGrandChildA1 = new MenuItem();
private MenuItem miGrandChildA2 = new MenuItem();
private MenuItem miGrandChildA3 = new MenuItem();
private MenuItem miGrandChildA4 = new MenuItem();
private MenuItem miGrandChildA5 = new MenuItem();
private MenuItem miGrandChildB1 = new MenuItem();
private MenuItem miGrandChildB2 = new MenuItem();
public Form1()
{
InitializeComponent();
mainMenu1.MenuItems.Add(mi1);
mainMenu1.MenuItems.Add(mi2);
mi2.MenuItems.Add(miChildA);
mi2.MenuItems.Add(miChildB);
miChildA.MenuItems.Add(miGrandChildA1);
miChildA.MenuItems.Add(miGrandChildA2);
miChildA.MenuItems.Add(miGrandChildA3);
miChildA.MenuItems.Add(miGrandChildA4);
miChildA.MenuItems.Add(miGrandChildA5);
miChildB.MenuItems.Add(miGrandChildB1);
miChildB.MenuItems.Add(miGrandChildB2);
// Event handler for the top left menu.
mi1.Click +=new EventHandler(mi1_Click);
// Event handlers for grandchild menu items. This code is commented out
// because this example does not define their event handling methods.
// miGrandChildA1.Click +=new EventHandler(miGrandChildA1_Click);
// miGrandChildB1.Click +=new EventHandler(miGrandChildB1_Click);
// miGrandChildB2.Click +=new EventHandler(miGrandChildB2_Click);
mi1.Text = "Map Help";
mi2.Text = "Maps";
miChildA.Text = "My Maps";
miChildB.Text = "Add and remove";
miGrandChildA1.Text = "Manhattan";
miGrandChildA2.Text = "Bronx";
miGrandChildA3.Text = "Brooklyn";
miGrandChildA4.Text = "Queens";
miGrandChildA5.Text = "Staten Island";
miGrandChildB1.Text = "Add map";
miGrandChildB2.Text = "Remove map";
}
protected override void Dispose( bool disposing )
{
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.mainMenu1 = new System.Windows.Forms.MainMenu();
this.Menu = this.mainMenu1;
this.Text = "Form1";
}
static void Main()
{
Application.Run(new Form1());
}
// The following method handles the
// Click event for the mi1 MenuItem.
private void mi1_Click(object sender, EventArgs e)
{
MessageBox.Show("This is just a test.");
}
}
}
编译代码
此示例需要引用下面的命名空间：