[英]How can I get the parent container, e.g. PhoneApplicationPage, in Windows Phone?
[英]How to get item container (e.g. stackpanel) from listbox
我有這樣的代碼
<ListBox x:Name="filterListBox" Height="60">
<ListBox.ItemsPanel>
<ItemsPanelTemplate>
<StackPanel Orientation="Horizontal"
VirtualizingStackPanel.VirtualizationMode="Standard"/>
</ItemsPanelTemplate>
</ListBox.ItemsPanel>
<ListBox.ItemTemplate>
<DataTemplate>
<StackPanel x:Name="TargetPanel">
</StackPanel>
</DataTemplate>
</ListBox.ItemTemplate>
<ListBox.Background>
<SolidColorBrush />
</ListBox.Background>
</ListBox>
我得到這個第一個列表框項目
object item = filterListBox.ItemContainerGenerator.ContainerFromIndex(0);
ListBoxItem lbi = item as ListBoxItem;
現在,我需要獲得一個名為“ TargetPanel”的堆棧面板,但我不知道如何。 你能幫忙嗎?
不幸的是,沒有通過簡單的方法調用來執行此操作的內置方法。 但是,這很容易。 通過對該示例進行一些修改,您可以按name
獲取DataTemplate的特定子級:
// the call
var item = filterListBox.ItemContainerGenerator
.ContainerFromIndex(0) as ListBoxItem;
var sp = FindVisualChild<StackPanel>(item, "TargetPanel");
// the variable sp should be set to the TargetPanel for the item now
您需要在某處添加的代碼(可能在“ helper”類中):
using System.Windows.Media; // for VisualTreeHelper
private static TChildItem FindVisualChild<TChildItem>(DependencyObject obj,
string matchName = "") where TChildItem : DependencyObject
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
{
var child = VisualTreeHelper.GetChild(obj, i);
if (child != null && child is TChildItem)
{
// match by name
var childName = child.GetValue(FrameworkElement.NameProperty) as string;
if (!string.IsNullOrWhiteSpace(matchName))
{
if (matchName == childName)
{
return (TChildItem)child;
}
}
else
{
return (TChildItem)child;
}
}
else
{
var childOfChild = FindVisualChild<TChildItem>(child, matchName);
if (childOfChild != null)
{
return childOfChild;
}
}
}
return null;
}
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