Windows.System Namespace

Enables system functionality such as launching apps, obtaining information about a user, and memory profiling.

Classes

AppActivationResult	Gets the result of activating an app via AppDiagnosticInfo.LaunchAsync.
AppDiagnosticInfo	Contains APIs for getting a basic set of diagnostic information for all running apps.
AppDiagnosticInfoWatcher	Allows you to monitor diagnostic information for an app and get notifications when an app is added or removed from the list of running apps.
AppDiagnosticInfoWatcherEventArgs	The data object passed to an AppDiagnosticInfoWatcher event.
AppExecutionStateChangeResult	Provides the result of an attempt to change an app's execution state (such as from running to suspended).
AppMemoryReport	Represents app memory usage at a single point in time.
AppMemoryUsageLimitChangingEventArgs	Provides data for the AppMemoryUsageLimitChanging event.
AppResourceGroupBackgroundTaskReport	Provides snapshot information about a background task such as its name, trigger name, entry point name, and task identifier.
AppResourceGroupInfo	Provides diagnostic information such as memory usage and energy use.
AppResourceGroupInfoWatcher	Allows you to monitor the set of resource groups (AppResourceGroupInfo objects) for an app, and get notifications when a resource group is added or removed.
AppResourceGroupInfoWatcherEventArgs	Provides information about app resource groups.
AppResourceGroupInfoWatcherExecutionStateChangedEventArgs	Provides info about the execution state of this resource group when the state changes.
AppResourceGroupMemoryReport	Provides memory information for a resource group, such as commit usage.
AppResourceGroupStateReport	Provides information, such as the execution state and energy quota usage, for a resource group.
AppUriHandlerHost	An object representation of the Host field in an AppUriHandler registration. These are used in conjunction with AppUriHandlerRegistration.
AppUriHandlerRegistration	Sets and retrieves dynamic AppUriHandlerHost entries for a given AppUriHandler registration.
AppUriHandlerRegistrationManager	Retrieves AppUriHandlerRegistrations for the calling package. This can be used to access AppUriHandler registrations.
DateTimeSettings	Sets the system date and time.
DispatcherQueue	Manages a prioritized queue on which tasks execute in a serial fashion on a thread.
DispatcherQueueController	Manages the lifetime of a DispatcherQueue. Provides methods to create and shutdown the DispatcherQueue.
DispatcherQueueShutdownStartingEventArgs	Provides the arguments for the ShutdownStarting event.
DispatcherQueueTimer	Periodically executes a task on a DispatcherQueue thread after a time interval has elapsed.
FolderLauncherOptions	Specifies the options to use when launching File Explorer to display the contents of a specific folder by calling the LaunchFolderAsync(IStorageFolder, FolderLauncherOptions) method. In a desktop app, before using an instance of this class in a way that displays UI, you'll need to associate the object with its owner's window handle. For more info, and code examples, see Display WinRT UI objects that depend on CoreWindow.
KnownUserProperties	Contains basic information about a user.
Launcher	Starts the default app associated with the specified file or URI.
LauncherOptions	Specifies the options used to launch the default app for a file or URI. In a desktop app, before using an instance of this class in a way that displays UI, you'll need to associate the object with its owner's window handle. For more info, and code examples, see Display WinRT UI objects that depend on CoreWindow.
LauncherUIOptions	Specifies options for user interface elements such as the application picker that can be invoked by this API.
LaunchUriResult	Represents the results of a Uri launch.
MemoryManager	Provides access to information on an app's memory usage.
ProcessLauncher	Starts the specified process with associated arguments, if any.
ProcessLauncherOptions	Specifies the options used to launch the specified process.
ProcessLauncherResult	Represents the return of the launched process.
ProcessMemoryReport	Represents process memory usage at a single point in time.
ProtocolForResultsOperation	Represents the result to the application that launched the current application for results.
RemoteLauncher	Starts the default app associated with the specified URI on a remote device.
RemoteLauncherOptions	Specifies the options used to launch the default app for URI on a remote device.
ShutdownManager	Manages the shutdown of devices that run in fixed-purpose mode.
TimeZoneSettings	Contains methods and properties for interacting with time zones.
User	Represents a user.
UserAuthenticationStatusChangeDeferral	Represents a user authentication status change deferral returned by the UserAuthenticationStatusChangingEventArgs.GetDeferral method.
UserAuthenticationStatusChangingEventArgs	Provides data for a user authentication status changing event.
UserChangedEventArgs	Provides data for a user changed event.
UserDeviceAssociation	Contains methods for querying for an association between a user and a device.
UserDeviceAssociationChangedEventArgs	Contains information about a UserDeviceAssociationChanged event.
UserPicker	Contains methods and properties for allowing a user to select a user account in multi-user scenarios.
UserWatcher	Provides events that fire during enumeration of users, when the collection of users changes, or when a user's authentication status changes.

Interfaces

ILauncherViewOptions

Contains methods for launcher view options.

Enums

AppDiagnosticInfoWatcherStatus	Defines the status values that are returned from a call to AppDiagnosticInfoWatcher.Status.
AppMemoryUsageLevel	An enumeration containing 4 levels of app memory usage: low, medium, high, and overlimit.
AppResourceGroupEnergyQuotaState	Describes how the resource group is performing relative to its energy quota.
AppResourceGroupExecutionState	Describes the execution state of the resource group.
AppResourceGroupInfoWatcherStatus	Describes the various states that the AppResourceGroupInfoWatcher may be in.
AutoUpdateTimeZoneStatus	The status of the automatic time zone request.
DiagnosticAccessStatus	Indicates if your app has permission to access to UWP app diagnostic information.
DispatcherQueuePriority	Defines the priority levels that can be given to work assigned to a DispatcherQueue.
LaunchFileStatus	Specifies the result of activating an application for a file.
LaunchQuerySupportStatus	Specifies whether an app is available that supports activation.
LaunchQuerySupportType	Specifies the type of activation to query for.
LaunchUriStatus	Specifies the result of activating an application for a URI.
PowerState	Represents power states for fixed-purpose devices.
ProcessorArchitecture	Specifies the processor architecture supported by an app.
RemoteLaunchUriStatus	Specifies the result of activating an application for a URI on a remote device.
ShutdownKind	Describes the types of shutdown that you can perform for a device that runs in fixed-purpose mode.
UserAgeConsentGroup	Specifies the age consent groups a user can belong to.
UserAgeConsentResult	Specifies the result of a call to CheckUserAgeConsentGroupAsync, querying for a user's membership in a specified UserAgeConsentGroup.
UserAuthenticationStatus	Represents the authentication status of a user.
UserPictureSize	Represents user picture sizes.
UserType	Represents user types.
UserWatcherStatus	Represents the status of a user watcher.
UserWatcherUpdateKind	Describes what kinds of changes were made to a user profile.
VirtualKey	Specifies the values for each virtual key.
VirtualKeyModifiers	Specifies the virtual key used to modify another keypress. For example, the Ctrl key when pressed in conjunction with another key, as in Ctrl+C.

Delegates

DispatcherQueueHandler

A callback that will be executed on the DispatcherQueue thread.

See also

• Launch the default app for a file
• Launch the default app for a URI
• Association launching sample
• Guidelines for file types and URIs
• User information sample