在 TreeView 中取消选择和重新选择 TreeViewItem [英] unselecting and reselecting a TreeViewItem in a TreeView

问题描述

我遇到了以下问题:

在我的 TreeView 中，当用户单击 TreeView 而不是 TreeViewItem 时，我通过调用我自己的 deselect() 方法添加了取消选择功能.这是我的 TreeView 方法:

In my TreeView i added unselect functionality by calling my own deselect()-method when the user clicks the TreeView but not a TreeViewItem. Here is my TreeView method:

public void deselectAll()
{
    TreeViewItem item = SelectedItem as TreeViewItem;
    if (item != null)
    {
        this.Focus();
        item.IsSelected = false;
    }
}

我的问题是，在取消选择 TreeViewItem 后，我无法重新选择它.我读过，关注 TreeView 本身应该可以解决这个问题，但事实并非如此.如果我将 'Focus()' 放在 'IsSelected = false' 之前或之后也无关紧要.

My problem is, that i can't reselect a TreeViewItem after i unselected it. I've read, that focusing the TreeView itself should solve this problem, but it's not. It also doesn't matter if i put the 'Focus()' before or after the 'IsSelected = false'.

有谁知道为什么这不起作用?任何想法将不胜感激.

Does anyone has an idea why this is not working? Any thoughts would be appreciated.

推荐答案

after you set item.IsSelected = false;你必须为你的树视图调用 .Focus().

after you set item.IsSelected = false; you have to call .Focus() for your treeview.

        <TreeView MouseLeftButtonDown="TreeView_MouseLeftButtonDown">
            <TreeViewItem Header="Employee1">
                <TreeViewItem Header="Jesper"/>
                <TreeViewItem Header="Aaberg"/>
                <TreeViewItem Header="12345"/>
            </TreeViewItem>
            <TreeViewItem Header="Employee2">
                <TreeViewItem Header="Dominik"/>
                <TreeViewItem Header="Paiha"/>
                <TreeViewItem Header="98765"/>
            </TreeViewItem>
        </TreeView>

    private void TreeView_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        var tv = sender as TreeView;

        if (tv != null)
        {
            var item = (TreeViewItem)tv.SelectedItem;
            item.IsSelected = false;
            tv.Focus();
        }
    }

你写的 focus() 没有解决你的问题.你在哪里调用你的 deselectAll()?

you wrote focus() dont solve your problem. where do you call your deselectAll()?

作为一种解决方法，您可以使用 MouseLeftDown 将项目设置为选中状态.

as a workaround you can use the MouseLeftDown to set an item as selected.

ps:不要忘记将答案标记为 anwser.

ps: dont forget to mark an answer as an anwser.

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