从集合中派生并覆盖您想要更改的行为。我能做到这一点是这样的:
public class PrestoObservableCollection<T> : ObservableCollection<T>
{
private bool _delayOnCollectionChangedNotification { get; set; }
/// <summary>
/// Add a range of IEnumerable items to the observable collection and optionally delay notification until the operation is complete.
/// </summary>
/// <param name="itemsToAdd"></param>
public void AddRange(IEnumerable<T> itemsToAdd)
{
if (itemsToAdd == null) throw new ArgumentNullException("itemsToAdd");
if (itemsToAdd.Any() == false) { return; } // Nothing to add.
_delayOnCollectionChangedNotification = true;
try
{
foreach (T item in itemsToAdd) { this.Add(item); }
}
finally
{
ResetNotificationAndFireChangedEvent();
}
}
/// <summary>
/// Clear the items in the ObservableCollection and optionally delay notification until the operation is complete.
/// </summary>
public void ClearItemsAndNotifyChangeOnlyWhenDone()
{
try
{
if (!this.Any()) { return; } // Nothing available to remove.
_delayOnCollectionChangedNotification = true;
this.Clear();
}
finally
{
ResetNotificationAndFireChangedEvent();
}
}
/// <summary>
/// Override the virtual OnCollectionChanged() method on the ObservableCollection class.
/// </summary>
/// <param name="e">Event arguments</param>
protected override void OnCollectionChanged(NotifyCollectionChangedEventArgs e)
{
if (_delayOnCollectionChangedNotification) { return; }
base.OnCollectionChanged(e);
}
private void ResetNotificationAndFireChangedEvent()
{
// Turn delay notification off and call the OnCollectionChanged() method and tell it we had a change in the collection.
_delayOnCollectionChangedNotification = false;
this.OnCollectionChanged(new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
}
}
我很想知道我的答案是否对您有帮助。它似乎完全符合你的要求。 – 2012-03-24 21:46:58
是的,它确实符合我的要求,但我希望有一个解决方案,不涉及子集的集合。也许是一种扩展方法...,这将在不改变Collection类型的情况下对实例起作用。谢谢。 – adentum 2012-03-24 22:00:28
那么,代码如下。你可以在扩展方法中使用它。而不是重写,只需使用新的(扩展名)方法名称即可。 – 2012-03-24 22:05:39