有效地将一系列值添加到 ObservableCollection

Collection<T> does not expose any method for doing this. List<T> has InsertRange(), but IList<T>, that Collection<T> exposes via its Items property does not.

有没有办法做到这一点?

Is there any way at all to do this?

推荐答案

ObservableCollection 公开了一个受保护的 Items 属性，该属性是没有通知语义的底层集合.这意味着您可以通过继承 ObservableCollection 来构建一个可以满足您需求的集合:

The ObservableCollection exposes an protected Items property which is the underlying collection without the notification semantics. This means you can build a collection that does what you want by inheriting ObservableCollection:

class RangeEnabledObservableCollection<T> : ObservableCollection<T>
{
    public void InsertRange(IEnumerable<T> items) 
    {
        this.CheckReentrancy();
        foreach(var item in items)
            this.Items.Add(item);
        this.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
    }
}

用法:

void Main()
{
    var collection = new RangeEnabledObservableCollection<int>();
    collection.CollectionChanged += (s,e) => Console.WriteLine("Collection changed");
    collection.InsertRange(Enumerable.Range(0,100));
    Console.WriteLine("Collection contains {0} items.", collection.Count);  
}

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