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Showing content from https://learn.microsoft.com/en-us/uwp/api/windows.applicationmodel.core.coreapplication below:

CoreApplication Class (Windows.ApplicationModel.Core) - Windows apps

CoreApplication Class Definition

Important

Some information relates to prerelease product that may be substantially modified before itâs released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Enables apps to handle state changes, manage windows, and integrate with a variety of UI frameworks.

public ref class CoreApplication abstract sealed

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
class CoreApplication final

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
public static class CoreApplication

Public Class CoreApplication

Inheritance: Object Platform::Object IInspectable CoreApplication

Attributes

Windows requirements Device family

Windows 10 (introduced in 10.0.10240.0)

API contract

Windows.Foundation.UniversalApiContract (introduced in v1.0)

Remarks

The system creates this object as a singleton when it runs the app. It is run as an Application Single-Threaded Apartment (ASTA). Threads created from the app singleton, such as the view provider (seen in the sample below), should be attributed as Multi-Threaded Apartment (MTAThread).

This API is supported in Universal Windows Platform apps only, except for the Properties property, which is always available.

struct App : implements<App, IFrameworkViewSource, IFrameworkView>
{
public:
    IFrameworkView CreateView()
    {
        return *this;
    }
};

...

int __stdcall wWinMain(HINSTANCE, HINSTANCE, PWSTR, int)
{
    Windows::ApplicationModel::Core::CoreApplication::Run(App());
}

ref class MyFrameworkViewSource : IFrameworkViewSource
{
public:
    virtual IFrameworkView^ CreateView()
    {
        return ref new MyFrameworkView();
    }
};

// ...

[Platform::MTAThread]
int main(Platform::Array<Platform::String^>^)
{
    auto frameworkViewSource = ref new MyFrameworkViewSource();
    Windows::ApplicationModel::Core::CoreApplication::Run(frameworkViewSource);
    return 0;
}

internal class ApplicationSource : IFrameworkViewSource
{
	public virtual IFrameworkView CreateView()
	{
		return new CoreApp();
	}
}

...

[MTAThread]
public static int Main()
{
	var appSource = new ApplicationSource();
	CoreApplication.Run(appSource);
	return 0;
}

Version history Windows version SDK version Value added 1607 14393 BackgroundActivated 1607 14393 EnablePrelaunch 1607 14393 EnteredBackground 1607 14393 LeavingBackground 1709 16299 RequestRestartAsync 1709 16299 RequestRestartForUserAsync Properties Id

Gets the package-relative app identifier for the process.

MainView

Gets the main CoreApplicationView instance for all running apps that use this CoreApplication instance.

Properties

Gets a property set that the app and UI frameworks can use to store info while the process is running.

Views

Gets all views for the app.

Methods Events See also

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