将项目添加到 ListView 时触发的事件? [英] Event fired when item is added to ListView?

问题描述

我有这个 XAML:

<ListView Name="NameListView"
          HorizontalAlignment="Stretch"
          VerticalAlignment="Stretch"
          Grid.Column="1">
    <ListView.View>
        <GridView>
            <GridViewColumn>
                <GridViewColumn.DisplayMemberBinding>
                    <MultiBinding StringFormat="{}{0} {1}">
                        <Binding Path="First" />
                        <Binding Path="Last" />
                    </MultiBinding>
                </GridViewColumn.DisplayMemberBinding>
            </GridViewColumn>
        </GridView>
    </ListView.View>
</ListView>

和一个名为names"的 ObservableCollection 绑定到我的代码隐藏中的 ListView.将新名称添加到集合中时，我希望 ListView 更改该新添加名称的背景颜色.我该怎么做?

and an ObservableCollection<Name> called "names" binded to the ListView in my code-behind. When a new new name is added to the collection, I want the ListView to change the background color of that newly added name. How do I go about doing it?

推荐答案

您可以订阅 listbox.Items 属性上的 ItemsChanged 事件.这有点棘手，因为你必须先施放它.订阅代码如下所示:

You can subscribe to the ItemsChanged event on your listbox.Items property. This is a little tricky because you have to cast it first. The code to subscribe would look like this:

((INotifyCollectionChanged)MainListBox.Items).CollectionChanged +=  ListBox_CollectionChanged;

然后在该事件中，您可以使用如下代码访问您的项目:

And then inside that event you can get to your item with code like this:

private void ListBox_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {
        if (e.NewItems.Count > 0)
        {
            Dispatcher.BeginInvoke(() =>
            {
                var newListItem = MainListBox.ItemContainerGenerator.ContainerFromItem(e.NewItems[0]) as Control;
                if (newListItem != null)
                {
                    newListItem.Background = System.Windows.Media.Brushes.Red;
                }
            }, DispatcherPriority.SystemIdle);
        }
    }

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