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System.Device.Location Namespace

The System.Device.Location namespace allows application developers to easily access the computer's location by using a single API. Location information may come from multiple providers, such as GPS, Wi-Fi triangulation, and cell phone tower triangulation. The System.Device.Location classes provide a single API to encapsulate the multiple location providers on a computer and support seamless prioritization and transitioning between them. As a result, application developers who use this API do not need to tailor applications to specific hardware configurations.

The GeoCoordinateWatcher class supplies location data that is based on latitude and longitude coordinates. The CivicAddressResolver and ICivicAddressResolver types provide the ability to resolve from a coordinate location to a civic address. Additionally, the IGeoPositionWatcher<T> interface can be implemented to extend the types of location data that are supplied.

In Windows 7, all the System.Device.Location classes are fully functional if a location provider is installed and can determine the computer's location. On Windows 7 Starter Edition, the Default Location Provider that can be set in Control Panel is the only location provider that is supported.

Note   In versions of Windows prior to Windows 7, the following conditions apply:

  • All System.Device.Location objects that have constructors can be created, but the Status property will always have the value Disabled.

  • The location indicated by the Location property of Position will always be Unknown.

  • No location events will be raised.

  ClassDescription
Public classCivicAddressRepresents a civic address. A civic address can include fields such as street address, postal code, state/province, and country or region.
Public classCivicAddressResolverProvides functionality for resolving a coordinate-based location to a civic address.
Public classGeoCoordinateRepresents a geographical location that is determined by latitude and longitude coordinates. May also include altitude, accuracy, speed, and course information.
Public classGeoCoordinateWatcherSupplies location data that is based on latitude and longitude coordinates.
Public classGeoPosition<T>Contains location data of a type specified by the type parameter of the GeoPosition<T> class.
Public classGeoPositionChangedEventArgs<T>Provides data for the PositionChanged event.
Public classGeoPositionStatusChangedEventArgsContains data for a GeoPositionStatusChanged event.
Public classResolveAddressCompletedEventArgsProvides data for the ResolveAddressCompleted event.

  InterfaceDescription
Public interfaceICivicAddressResolverProvides a method that when implemented, resolves a latitude/longitude location to a civic address.
Public interfaceIGeoPositionWatcher<T>Interface that can be implemented for providing accessing location data and receiving location updates.

  EnumerationDescription
Public enumerationGeoPositionAccuracySpecifies the requested accuracy level for the location data that the application uses.
Public enumerationGeoPositionPermissionIndicates whether the calling application has permission to access location data.
Public enumerationGeoPositionStatusIndicates the ability of the location provider to provide location updates.

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