如何在C++/CX中从XAML资源中获取CommandBar？

#include <winrt/Windows.UI.Xaml.Controls.h>
#include <winrt/Windows.UI.Xaml.Hosting.h>

using namespace winrt;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Hosting;

void GetCommandBarFromXaml()
{
    // 假设你的XAML页面中有一个ID为"MainCommandBar"的CommandBar
    auto rootElement = Application::Current().Content();
    if (rootElement)
    {
        // 查找CommandBar
        auto commandBar = rootElement.as<FrameworkElement>().FindName(L"MainCommandBar");
        if (commandBar)
        {
            // 成功找到CommandBar
            // 这里可以进行进一步的操作，比如添加按钮等
            OutputDebugString(L"CommandBar found successfully.\n");
        }
        else
        {
            // 未找到CommandBar
            OutputDebugString(L"CommandBar not found.\n");
        }
    }
}

void MainPage::OnLoaded(Platform::Object^ sender, Windows::UI::Xaml::RoutedEventArgs^ e)
{
    GetCommandBarFromXaml();
}

<Page
    x:Class="YourNamespace.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:YourNamespace"
    Loaded="OnLoaded">

    <CommandBar x:Name="MainCommandBar">
        <!-- 添加你的按钮和其他控件 -->
    </CommandBar>
</Page>