清除其他列表视图选择

本文关键字：选择 视图 列表 其他 清除 | 更新日期: 2023-09-27 18:06:50

如何正确清除其他ListView中的选择?例如，我有4个列表视图堆叠，如果我在listView1中有一个选择，那么我在listView2中选择一个新项目，我希望listView1中的选择消失，listView2中的项目被正确选择。注意:列表视图是单一选择。

<StackPanel>
   <ListView x:Name="listView1" />
   <ListView x:Name="listView2" />
   <ListView x:Name="listView3" />
   <ListView x:Name="listView4" />
</StackPanel>

I first try:

<StackPanel>
   <ListView x:Name="listView1" SelectionChanged="selectionchanged1" />
   <ListView x:Name="listView2" SelectionChanged="selectionchanged2" />
   <ListView x:Name="listView3" SelectionChanged="selectionchanged3" />
   <ListView x:Name="listView4" SelectionChanged="selectionchanged4" />
</StackPanel>

背后的代码:

private void selectionChanged1(object sender, SelectionChangedEventArgs e)
{
    listView2.SelectedItem = null;
    listView3.SelectedItem = null;
    listView4.SelectedItem = null;
}
private void selectionChanged2(object sender, SelectionChangedEventArgs e)
{
    listView1.SelectedItem = null;
    listView3.SelectedItem = null;
    listView4.SelectedItem = null;
}
...

我遇到的问题是，在listView1中进行选择并单击listView2中的一个项目后，listView1中的选择被清除，但listView2中的项目未被选中。

原因是有(至少)2个事件被触发:

  1. selectionchanged2触发，清除listview 1,3,4中的选择
  2. 因为我正在清除listview1中的选择，selectionchanged1也被触发，它清除listview2,3,4中的选择
  3. 我认为selectionchanged2再次被触发。
  4. 因此我在任何列表中都没有选择。
你有更好的建议吗?

清除其他列表视图选择

当你将ListView的SelectedItem设置为null时，SelectionChanged事件将再次触发，因为ListView的SelectedItem被更改了，所以你可以使用一个标志来跳过第二个SelectionChanged甚至调用。

检查下面的代码片段。我希望这会对你有所帮助。

在XAML 

<Window x:Class="ListView.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:ListView"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel x:Name="MyStackPanel">
            <ListView x:Name="listView1" SelectionChanged="listView1_SelectionChanged" SelectionMode="Single">
                <ListViewItem>Item 1</ListViewItem>
                <ListViewItem>Item 2</ListViewItem>
            </ListView>
            <ListView x:Name="listView2" SelectionChanged="listView1_SelectionChanged" SelectionMode="Single">
                <ListViewItem>Item 3</ListViewItem>
                <ListViewItem>Item 4</ListViewItem>
            </ListView>
            <ListView x:Name="listView3" SelectionChanged="listView1_SelectionChanged" SelectionMode="Single">
                <ListViewItem>Item 5</ListViewItem>
                <ListViewItem>Item 6</ListViewItem>
            </ListView>
            <ListView x:Name="listView4" SelectionChanged="listView1_SelectionChanged" SelectionMode="Single">
                <ListViewItem>Item 7</ListViewItem>
                <ListViewItem>Item 8</ListViewItem>
            </ListView>
        </StackPanel>
    </Grid>
</Window>

后台代码

namespace ListView
{
    using System.Windows;
    using System.Windows.Controls;
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private bool skipSelectionChanged;
        public MainWindow()
        {
            InitializeComponent();
        }
        private void listView1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (skipSelectionChanged)
            {
                skipSelectionChanged = false;
                return;
            }
            var listView = sender as ListView;
            if (listView != null)
            {
                var name = listView.Name;
                for (int i = 0; i < MyStackPanel.Children.Count; i++)
                {
                    var child = MyStackPanel.Children[i] as ListView;
                    if (child.Name != name && child.SelectedItem != null)
                    {
                        skipSelectionChanged = true;
                        child.SelectedItem = null;
                    }
                }
            }
        }
    }
}

我想你可以尝试使用这个SelectionChanged事件为所有的ListViews:

private void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (e.AddedItems.Count != 0)
    {
        if (listView1 != sender as ListView) listView1.SelectedItem = null;
        if (listView2 != sender as ListView) listView2.SelectedItem = null;
        if (listView3 != sender as ListView) listView3.SelectedItem = null;
        if (listView4 != sender as ListView) listView4.SelectedItem = null;
    }
}

它只是检查是否有新的东西在ListView，如果是，然后清除所有其他ListViews。

也许可以试试这样:将它们都链接到同一个处理程序，例如:

<StackPanel>
   <ListView x:Name="listView1" SelectionChanged="selectionchanged" />
   <ListView x:Name="listView2" SelectionChanged="selectionchanged" />
   <ListView x:Name="listView3" SelectionChanged="selectionchanged" />
   <ListView x:Name="listView4" SelectionChanged="selectionchanged" />
</StackPanel>

然后:

private void selectionChanged(object sender, SelectionChangedEventArgs e)
{
    string listViewName = ((ListView)sender).Name;
    if (listViewName == "listView1")
    {
        listView2.SelectedItem = null;
        listView3.SelectedItem = null;
        listView4.SelectedItem = null;
    }
    else if (listViewName == "listView3")
    {
        listView1.SelectedItem = null;
        listView2.SelectedItem = null;
        listView4.SelectedItem = null;
    }
    else if (listViewName == "listView4")
    {
        listView1.SelectedItem = null;
        listView2.SelectedItem = null;
        listView3.SelectedItem = null;
    }
    else if (listViewName == "listView2")
    {
        listView1.SelectedItem = null;
        listView3.SelectedItem = null;
        listView4.SelectedItem = null;
    }
}

这是混乱和长(和未经测试)，但让我知道它是否有效。

您可以在清除其他字段(如

)之前添加空检查。listView1

: 

private void selectionChanged1(object sender, SelectionChangedEventArgs e)
{
    if(listView1.SelectedItem == null)
    {
        listView2.SelectedItem = null;
        listView3.SelectedItem = null;
        listView4.SelectedItem = null;
    }
}

同样，您也可以为其他属性更改。

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