Window Class

Definition

Namespace:

Windows.UI.Xaml

Represents an application window.

C#

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class Window

Inheritance

Object Window

Attributes

ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

The following code example shows the OnLaunched method override generated for the blank application template in Microsoft Visual Studio. This code demonstrates typical usage patterns for the Current and Content properties and the Activate method.

C#

protected override void OnLaunched(LaunchActivatedEventArgs args)
{
    // Create a Frame to act navigation context and navigate to the first page
    var rootFrame = new Frame();
    rootFrame.Navigate(typeof(BlankPage));

    // Place the frame in the current Window and ensure that it is active
    Window.Current.Content = rootFrame;
    Window.Current.Activate();
}

Remarks

This class represents the window of the current Application. In the same manner as the static Application property, the static Current property will return the app window object. From this object, an app can utilize the Dispatcher or determine the size of the Window from the Bounds property. The most common usage for Window is setting a UIElement to the Content that represents the app UI. This is usually done as part of app activation (for example in the OnLaunched override.) You can change this window content throughout the lifetime of the window.

There is no XAML representation of the Window class because it is not a control.

A Window object is just surfacing information from CoreWindow, which in turn is referencing the window created by the system.

Make sure to call Activate on any Window you use on initial activation. If you use the default app templates from Microsoft Visual Studio, calling Window.Activate is part of the initial code in the app.xaml code-behind file.

The LayoutAwarePage class that is part of some application templates in Microsoft Visual Studio has handling for the SizeChanged event, which is used for keeping track of visual states that match values of ApplicationViewState. LayoutAwarePage also has code that checks Bounds and uses this value to influence how page-wide input events are handled.

Version history

Windows version	SDK version	Value added
1703	15063	Compositor
1903	18362	UIContext

Additional interface members

IXamlSourceTransparency.IsBackgroundTransparent

Gets or sets a value that specifies whether the background of all DesktopWindowXamlSource objects on the current thread is transparent.

Properties

Bounds	Gets a Rect value that contains the origin, height, and width of the client area of the window, in device-independent pixels (DIPs).
Compositor	Gets the Compositor for this window.
Content	Gets or sets the visual root of an application window.
CoreWindow	Gets an internal core object for the application window.
Current	Gets the window of the current thread.
Dispatcher	Gets the CoreDispatcher object for the Window, which is generally the CoreDispatcher for the UI thread.
UIContext	Gets the context identifier for the window.
Visible	Gets a value that reports whether the window is visible.

Methods

Activate()	Attempts to activate the application window by bringing it to the foreground and setting the input focus to it.
Close()	Closes the application window.
SetTitleBar(UIElement)	Makes a XAML element interact with the system as if it’s the title bar.

Events

Activated	Occurs when the window has successfully been activated.
Closed	Occurs when the window has closed.
SizeChanged	Occurs when the app window has first rendered or has changed its rendering size.
VisibilityChanged	Occurs when the value of the Visible property changes.

Applies to

See also

• OnLaunched(LaunchActivatedEventArgs)
• CoreWindow
• Handle app activation