<Application x:Class="SmallTool.App"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:local="clr-namespace:SmallTool"
             StartupUri="SyncTime.xaml">
    <Application.Resources>
        <ResourceDictionary>
            <ContextMenu x:Key="NotifyIconMenu" StaysOpen="False">
                <MenuItem Name="MenuOpen" Click="MenuOpen_Click" Header="打开" />
                <MenuItem Name="MenuExit" Click="MenuExit_Click" Header="退出" />
            </ContextMenu>
            <ResourceDictionary.MergedDictionaries>
                <ResourceDictionary Source="/Resources/Styles.xaml"/>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>
</Application>

public class NotifyIconBar
{
    public static NotifyIconBar Instance;
    public static event MouseEventHandler DoubleClick;
    public NotifyIcon Notify { get; set; }
    static NotifyIconBar() { Instance = new NotifyIconBar(); }
    private NotifyIconBar()
    {
        Notify = new NotifyIcon();
        Notify.Icon = new Icon(System.Windows.Application.GetResourceStream(new Uri("Resources/favicon.ico", UriKind.Relative)).Stream);
        Notify.MouseDoubleClick += Nofity_MouseDoubleClick;
        Notify.MouseClick += Nofity_MouseClick;
        Notify.Visible = true;
    }
    private void Nofity_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        if (DoubleClick != null) { DoubleClick(sender, e); }
    }
    private void Nofity_MouseClick(object sender, MouseEventArgs e)
    {
        System.Windows.Controls.ContextMenu NotifyIconMenu = (System.Windows.Controls.ContextMenu)App.Current.FindResource("NotifyIconMenu");
        if (e.Button == MouseButtons.Right) { NotifyIconMenu.IsOpen = true; } else { NotifyIconMenu.IsOpen = false; }
    }
    public void DisposeNotifyIcon() { Notify?.Dispose(); }
}