打开和关闭绑定

Question

Suppose you have a ViewModel with an ObservableCollection (OC) that is bound to some control inside the View.

Is there a way to temporarily disable the binding between the OC and the Control without removing the binding ? I want to have the ability to modify my ObservableCollection without having the View being informed of it.

The reason for that is simple: I am doing a lot of Add() and Insert() operations on the OC. Most of the time everything is OK but sometimes I am calling Add() so frequently that the updates in the View are looking unpleasant. For these periods of time I want to 'switch off' the binding beforehand and 'turn it on' afterwards.

Has anybody been in a similar situation / does anybody has a tip ?

Answer 1

只需包装ObservableCollection （甚至继承自ObservableCollection ），然后通过添加自定义逻辑来覆盖mthod OnCollectionChanged ，这将考虑您的要求推迟事件触发，我相信这是实现自己的可观观察性集合的相当标准的方法。

Answer 2

When I have a lot of items in the collection, I prefer to use a List<> as the source of a CollectionViewSource. Then the view binds to the CollectionViewSource.View. CollectionViewSource has methods DeferRefresh() and Refresh() that let you do all the background work of changing the source list without view notifications. The performance of CollectionViewSource is way better than an ObservableCollection, plus it supports filtering. Filtering might be what you need if you are constantly adding and removing items.