如何訪問ListBoxItems

Question

的可視性財產在我的WPF程序中，我有一個ListBox控制：

<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> 

我如何可以訪問ListBoxItems的Visibility財產？我的代碼不工作：

mailsListBox.Items[1].Visibility = Visible; 

Answer 1

像這樣：

(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;