https://learn.microsoft.com/en-us/uwp/api/windows.storage.search.istoragequeryresultbase.getitemcountasync?view=winrt-28000
IStorageQueryResultBase.GetItemCountAsync Method (Windows.Storage.Search) - Windows apps |...
Retrieves the number of items that match the query that created a StorageFileQueryResult, StorageFolderQueryResult, or StorageItemQueryResult object.
methodwindowsstoragesearchapps