c# - 强制实例化 xaml 资源

Question

让我们考虑一个具有以下 XAML (App.xaml) 的 WPF 应用程序：

<Application
  x:Class="My.App"
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  xmlns:my="clr-namespace:My.Namespace;assembly=My.Assembly"
  ShutdownMode="OnExplicitShutdown"
  >
  <Application.Resources>
    <my:NotificationIcon x:Key="notificationIcon" ApplicationExit="notificationIcon_ApplicationExit" />
  </Application.Resources>
</Application>

和 App.xaml.cs：

public partial class App : Application
{
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        FindResource("notificationIcon");
    }

    void notificationIcon_ApplicationExit(object sender, EventArgs eventArgs)
    {
        Application.Current.Shutdown();
    }
}

在我调用此代码之前，似乎没有实例化 notificationIcon 资源：

FindResource("notificationIcon");

在 OnStartup() 方法中。是否有可能以不需要此 FindResource() 调用并且自动实例化该对象的方式编写 XAML？

Answer 1

public partial class App : Application
{
    public NotificationIcon NotifyIcon {get;set;}

    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);

        NotifyIcon = new NotificationIcon();
        NotifyIcon.ApplicationExit += notificationIcon_ApplicationExit;
    }

    void notificationIcon_ApplicationExit(object sender, EventArgs eventArgs)
    {
        Application.Current.Shutdown();
    }
}

...并将其从 XAML 中删除。