如何让.NET WPF托盘图标右键菜单点击外部自动关闭

问题根源：你使用WPF的ContextMenu配合WinForms的NotifyIcon，两者分属不同UI框架，WPF菜单无法感知WinForms托盘图标的系统级菜单交互逻辑，因此StaysOpen="False"无法触发点击外部自动关闭的行为。

推荐解决方案：使用WinForms原生ContextMenuStrip #

这是最贴合托盘图标原生行为的方案，自动支持点击外部关闭菜单，无需额外逻辑处理。

修改步骤： #

1. 替换WPF ContextMenu为WinForms的ContextMenuStrip
2. 为菜单添加选项并绑定点击事件
3. 将菜单直接赋值给NotifyIcon的ContextMenuStrip属性

修改后的C#代码： #

public partial class MainWindow : Window
{
    public NotifyIcon m_notifyIcon;
    private ContextMenuStrip _trayMenu;

    public MainWindow()
    {
        InitializeComponent();
        m_notifyIcon = new System.Windows.Forms.NotifyIcon();
        m_notifyIcon.BalloonTipText = "应用已最小化，点击托盘图标显示。";
        m_notifyIcon.BalloonTipTitle = "我的应用";
        m_notifyIcon.Text = "我的应用";
        m_notifyIcon.Icon = new System.Drawing.Icon("48x48_active.ico");
        m_notifyIcon.DoubleClick += m_notifyIcon_Click;

        // 创建WinForms上下文菜单
        _trayMenu = new ContextMenuStrip();
        _trayMenu.Items.Add("打开", null, Menu_Open);
        _trayMenu.Items.Add("关闭", null, Menu_Close);
        // 绑定到NotifyIcon
        m_notifyIcon.ContextMenuStrip = _trayMenu;

        Hide();
        m_notifyIcon?.ShowBalloonTip(2000);
        CheckTrayIcon();
    }

    void OnClose(object sender, CancelEventArgs args)
    {
        _trayMenu.Dispose();
        m_notifyIcon.Dispose();
        m_notifyIcon = null;
    }

    private WindowState m_storedWindowState = WindowState.Normal;

    void OnStateChanged(object sender, EventArgs args)
    {
        if (WindowState == WindowState.Minimized)
        {
            Hide();
            m_notifyIcon?.ShowBalloonTip(2000);
        }
        else
            m_storedWindowState = WindowState;
    }

    void OnIsVisibleChanged(object sender, DependencyPropertyChangedEventArgs args)
    {
        CheckTrayIcon();
    }

    void m_notifyIcon_Click(object sender, EventArgs e)
    {
        Show();
        WindowState = m_storedWindowState;
    }

    void CheckTrayIcon()
    {
        ShowTrayIcon(true);
    }

    void ShowTrayIcon(bool show)
    {
        m_notifyIcon.Visible = show;
    }

    private void Menu_Open(object sender, EventArgs e)
    {
        Show();
        WindowState = m_storedWindowState;
    }

    private void Menu_Close(object sender, EventArgs e)
    {
        System.Windows.Application.Current.Shutdown();
    }
}

修改后的XAML（删除无用的WPF ContextMenu）： #

<Window x:Class="TrayApp.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:TrayApp"
        mc:Ignorable="d"
        StateChanged="OnStateChanged" IsVisibleChanged="OnIsVisibleChanged"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
    </Grid>
</Window>

备选方案：手动处理WPF ContextMenu的外部点击 #

若必须使用WPF的ContextMenu，需手动监听全局鼠标事件来关闭菜单：

修改代码： #

1. 在MainWindow中添加全局鼠标事件处理逻辑：

private ContextMenu _currentContextMenu;

void notifier_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
    if (e.Button == MouseButtons.Right)
    {
        _currentContextMenu = (ContextMenu)this.FindResource("NotifierContextMenu");
        _currentContextMenu.IsOpen = true;
        // 注册全局外部点击事件
        System.Windows.Input.Mouse.AddPreviewMouseDownOutsideCapturedElementHandler(this, OnMouseDownOutsideMenu);
    }
}

private void OnMouseDownOutsideMenu(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    if (_currentContextMenu != null && _currentContextMenu.IsOpen)
    {
        _currentContextMenu.IsOpen = false;
        System.Windows.Input.Mouse.RemovePreviewMouseDownOutsideCapturedElementHandler(this, OnMouseDownOutsideMenu);
        _currentContextMenu = null;
    }
}

private void NotifierContextMenu_Closed(object sender, RoutedEventArgs e)
{
    System.Windows.Input.Mouse.RemovePreviewMouseDownOutsideCapturedElementHandler(this, OnMouseDownOutsideMenu);
    _currentContextMenu = null;
}

2. 在XAML中为ContextMenu添加Closed事件：

<ContextMenu x:Key="NotifierContextMenu" StaysOpen="False" Placement="MousePoint" Closed="NotifierContextMenu_Closed">
    <MenuItem Header="Open" Click="Menu_Open"/>
    <MenuItem Header="Close" Click="Menu_Close"/>
</ContextMenu>

注意事项： #

备选方案需要手动处理全局事件，在多窗口、高DPI等复杂场景下可能存在兼容性问题，因此优先推荐使用WinForms原生菜单方案。

内容的提问来源于stack exchange，提问作者Kaan Çağhan