如何访问 ListBoxItems 的 Visibility 属性

Question

在我的 WPF 程序中，我有一个 ListBox 控件：

<ListBox x:Name="mailsListBox" SelectionChanged="mailsListBox_SelectionChanged" >
    <ListBoxItem Content="..." Background="#FFF3F3F3" Margin="0,0,0,1" />
    <ListBoxItem Content="...." Margin="0,0,0,1" Visibility="Hidden"/>
</ListBox>

如何访问ListBoxItems 的Visibility 属性？我的代码不起作用：

mailsListBox.Items[1].Visibility = Visible;

Answer 1

像这样：

(mailsListBox.Items[1] as ListBoxItem).Visibility = Visibility.Visible;

或者你可以使用ItemContainerGenerator.ContainerFromItem方法：

((ListBoxItem)(mailsListBox.ItemContainerGenerator.ContainerFromItem(mailsListBox.Items[1]))).Visibility = Visibility.Visible;