AutomationPeer.ListenerExists(AutomationEvents) Method
Definition
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
Gets a value that indicates whether UI Automation is listening for the specified event.
public:
static bool ListenerExists(System::Windows::Automation::Peers::AutomationEvents eventId);
public static bool ListenerExists (System.Windows.Automation.Peers.AutomationEvents eventId);
static member ListenerExists : System.Windows.Automation.Peers.AutomationEvents -> bool
Public Shared Function ListenerExists (eventId As AutomationEvents) As Boolean
Parameters
- eventId
- AutomationEvents
One of the enumeration values.
Returns
A boolean
that indicates whether UI Automation is listening for the event.
Remarks
Typically, you call this method before creating the AutomationPeer that raises the event. This method is a performance measure because if UI Automation does not listen for the event, it does not make sense to create a peer to raise one.
Note
This method is static and only answers if a delegate listens for the specified event in UI Automation, not for an event on a specific element. UI Automation can create broadcast listeners; therefore the per-element information is irrelevant.
Applies to
See also
Σχόλια
https://aka.ms/ContentUserFeedback.
Σύντομα διαθέσιμα: Καθ' όλη τη διάρκεια του 2024 θα καταργήσουμε σταδιακά τα ζητήματα GitHub ως μηχανισμό ανάδρασης για το περιεχόμενο και θα το αντικαταστήσουμε με ένα νέο σύστημα ανάδρασης. Για περισσότερες πληροφορίες, ανατρέξτε στο θέμα:Υποβολή και προβολή σχολίων για