WPF的ListView - 检测被点击所选项目时， [英] WPF ListView - detect when selected item is clicked

问题描述

我使用它显示的数据绑定项目列表的WPF ListView控件。

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>

我试图获得类似于 ListView.SelectionChanged 事件中的行为，只是我想如果单击当前选择的项目也检测。如果同一项目再次点击的SelectionChanged 不会触发事件（显然）。

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).

什么是最好的（干净）的方式来处理这个？

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

推荐答案

使用的ListView.ItemContainerStyle财产给你一个ListViewItems EventSetter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>

code-背后：

Code-behind:

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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