Linguaggio

StorageLibraryChangeTracker.Disable Metodo

Definizione

Spazio dei nomi:
Windows.Storage
Modifica

Disabilita il rilevamento delle modifiche per StorageFolder o StorageLibrary.

public:
 virtual void Disable() = Disable;
void Disable();
public void Disable();
function disable()
Public Sub Disable ()

Requisiti Windows

Requisiti Descrizione
Famiglia di dispositivi
Windows 10, version 2104 (è stato introdotto in 10.0.20348.0)
API contract
Windows.Foundation.UniversalApiContract (è stato introdotto in v12.0)

Esempio

// applications are expected to persist the previous value
UINT64 appsLastPersistedChangeId = StorageLibraryLastChangeId::Unknown();
StorageFolder folder = StorageFolder::GetFolderFromPathAsync(L"my folder path").get();

StorageLibraryChangeTracker tracker = folder.TryGetChangeTracker();
if (tracker != nullptr)
{
StorageLibraryChangeTrackerOptions ops;
ops.TrackChangeDetails(false);
tracker.Enable(ops);

StorageLibraryChangeReader reader = tracker.GetChangeReader();
if (reader != nullptr)
{
    UINT32 changeId = reader.GetLastChangeId();
    if ((changeId == StorageLibraryLastChangeId::Unknown())
    {
        ScanFolderSlow();
    }
    else if (changeId == 0)
    {
        // no changes in the storage folder yet, OR nothing has changed
        ProcessNormalApplicationStartup();
    }
    else if (changeId != appsLastPersistedChangeId)
    {
        // There have been new changes since we’ve last ran, process them
        appsLastPersistedChangeId = changeId;
        ScanFolderForChanges();
    }
    else
    {
        // changeId and our last persisted change id match, also normal application startup
        ProcessNormalApplicationStartup();
    }
}
}

Commenti

Questo metodo non farà nulla se l'applicazione chiamante non ha ancora chiamato Enable on the StorageFolder/StorageLibrary.

Si applica a

Vedi anche