C++：要使用什么类型的标识符？

Question

我无法确定要在以下代码中使用的标识符类型。我从 Microsoft UWP blog

中获取了代码示例

但我似乎无法理解如何实现它？所以请帮我把它弄好。谢谢

stackCount // is undefined in following code.


void StartPage::OnNavigatedTo(NavigationEventArgs^ e)
{
    auto rootFrame = dynamic_cast<Windows::UI::Xaml::Controls::Frame^>(Window::Current->Content);

    Platform::String^ myPages = "";

    if (rootFrame == nullptr)
        return;

    for each (PageStackEntry^ page in rootFrame->BackStack)
    {
        myPages += page->SourcePageType.ToString() + "\n";
    }

    stackCount->Text = myPages; // stackCount is undefined here

    if (rootFrame->CanGoBack)
    {
        // If we have pages in our in-app backstack and have opted in to showing back, do so
        Windows::UI::Core::SystemNavigationManager::GetForCurrentView()->AppViewBackButtonVisibility =
        Windows::UI::Core::AppViewBackButtonVisibility::Visible;
    }
    else
    {
        // Remove the UI from the title bar if there are no pages in our in-app back stack
        Windows::UI::Core::SystemNavigationManager::GetForCurrentView()->AppViewBackButtonVisibility =
        Windows::UI::Core::AppViewBackButtonVisibility::Collapsed;
    }
}

Answer 1

假定 stackCount 是多行 TextBlock，因为示例设置了 Text 属性。将其添加到您的 XAML 页面。

C++：要使用什么类型的标识符？

C++ : What type of Identifier to be used?

c++-cx

uwp