WPF：当项目在ListView中添加触发事件 [英] WPF: Raise an Event when Item is added in ListView

问题描述

我工作的WPF和我使用一个ListView，我需要当一个项目被添加到它来触发一个事件。我曾尝试这样的：

I am working on WPF and I am using a ListView, and I need to fire an event when an item is added to it. I have tried this:

var dependencyPropertyDescriptor = DependencyPropertyDescriptor.FromProperty(ItemsControl.ItemsSourceProperty, typeof(ListView));
        if (dependencyPropertyDescriptor != null)
        {
               dependencyPropertyDescriptor.AddValueChanged(this, ItemsSourcePropertyChangedCallback);
        }

......

.....

 private void ItemsSourcePropertyChangedCallback(object sender, EventArgs e)
    {
         RaiseItemsSourcePropertyChangedEvent();
    }

不过，这似乎是工作，只有当整个集合改变了，我看了这篇文章：<一href=\"http://stackoverflow.com/questions/5904519/event-fired-when-item-is-added-to-listview\">event-fired-when-item-is-added-to-listview,但最好的答案适用于只有一个列表框。我试图改变code到ListView的，但我不是能够做到这一点。

But It seems to be working only when the entire collection is changed, I have read this post: event-fired-when-item-is-added-to-listview, but the best answer applies for a listBox only. I tried to change the code to ListView but I wasnt able to do that.

我希望你能帮助我。谢谢你在前进。

I hope You can help me. Thank you in advance.

推荐答案

的注意一个WPF列表视图这只是工程！的

经过一番研究，我已经找到了答案，我的问题，这真的很容易：

After some research I have found the answer to my question and It's really easy:

public MyControl()
{
    InitializeComponent();
    ((INotifyCollectionChanged)listView.Items).CollectionChanged +=  ListView_CollectionChanged;
}

private void ListView_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)     
{
    if (e.Action == NotifyCollectionChangedAction.Add)
    {
      // scroll the new item into view   
      listView.ScrollIntoView(e.NewItems[0]);
    }
}

其实， NotifyCollectionChangedAction 枚举允许程序通知你有关的任何变化，如：添加，移动，替换，删除和重置

Actually, the NotifyCollectionChangedAction enum allows your program to inform you about any change such as: Add, Move, Replace, Remove and Reset.

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