변경 사항에 대응 - .NET SDK

// Watch for collection notifications.
var subscriptionToken = realm.All<Dog>()
    .SubscribeForNotifications((sender, changes) =>
{
    if (changes == null)
    {
        // This is the case when the notification is called
        // for the first time.
        // Populate tableview/listview with all the items
        // from `collection`
        return;
    }
    // Handle individual changes
    foreach (var i in changes.DeletedIndices)
    {
        // ... handle deletions ...
    }
    foreach (var i in changes.InsertedIndices)
    {
        // ... handle insertions ...
    }
    foreach (var i in changes.NewModifiedIndices)
    {
        // ... handle modifications ...
    }
    if (changes.IsCleared)
    {
        // A special case if the collection has been cleared:
        // i.e., all items have been deleted by calling
        // the Clear() method.
    }
});

var query = realm.All<Person>();
KeyPathsCollection kpc;
// Use one of these equivalent declarations to 
// specify the fields you want to monitor for changes:
kpc = KeyPathsCollection.Of("Email", "Name");
kpc = new List<KeyPath> {"Email", "Name"};
// To get all notifications for top-level properties
// and 4 nested levels of properties, use the `Full` 
// static value:
kpc = KeyPathsCollection.Full;
// To receive notifications for changes to the
// collection only and none of the properties,
// use the `Shallow` static value:
kpc = KeyPathsCollection.Shallow;
query.SubscribeForNotifications(notificationCallback, kpc);

{
    // Subscribe to a query
    realm.All<Dog>().AsRealmCollection().CollectionChanged +=
        HandleCollectionChanged;
    // Subscribe to a property collection
    gracie.Owners.AsRealmCollection().CollectionChanged +=
        HandleCollectionChanged;
   ...
}
private void HandleCollectionChanged(object? sender,
    NotifyCollectionChangedEventArgs e)
{
    // Use e.Action to get the
    // NotifyCollectionChangedAction type.
    if (e.Action == NotifyCollectionChangedAction.Add)
    {
        // etc.
    }
}