WPF ListView - 检测何时单击所选项目 [英] WPF ListView - detect when selected item is clicked

问题描述

我正在使用 WPF ListView 控件，该控件显示数据绑定项目的列表.

I'm using a WPF ListView control which displays a list of databound items.

<ListView ItemsSource={Binding MyItems}>
    <ListView.View>
        <GridView>
            <!-- declare a GridViewColumn for each property -->
        </GridView>
    </ListView.View>
</ListView>

我正在尝试获得类似于 ListView.SelectionChanged 事件的行为，只是我还想检测是否单击了当前选定的项目.如果再次单击相同的项目(显然)，则 SelectionChanged 事件不会触发.

I'm trying to obtain a behavior similar to the ListView.SelectionChanged event, only I want to also detect if the currently selected item is clicked. The SelectionChanged event does not fire if the same item is clicked again (obviously).

解决此问题的最佳(最干净)方法是什么?

What would be the best (cleanest) way to approach this?

推荐答案

使用 ListView.ItemContainerStyle 属性为您的 ListViewItems 提供一个 EventSetter，它将处理 PreviewMouseLeftButtonDown 事件.然后，在处理程序中，检查是否选择了被点击的项目.

Use the ListView.ItemContainerStyle property to give your ListViewItems an EventSetter that will handle the PreviewMouseLeftButtonDown event. Then, in the handler, check to see if the item that was clicked is selected.

XAML:

<ListView ItemsSource={Binding MyItems}>
    <ListView.View>
        <GridView>
            <!-- declare a GridViewColumn for each property -->
        </GridView>
    </ListView.View>
    <ListView.ItemContainerStyle>
        <Style TargetType="ListViewItem">
            <EventSetter Event="PreviewMouseLeftButtonDown" Handler="ListViewItem_PreviewMouseLeftButtonDown" />
        </Style>
    </ListView.ItemContainerStyle>
</ListView>

代码隐藏:

private void ListViewItem_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    var item = sender as ListViewItem;
    if (item != null && item.IsSelected)
    {
        //Do your stuff
    }
}

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