[英]Wp8:Not able to get checkBox in listbox
我在列表框xaml中找不到復選框:
<ListBox x:Name="my_list" Grid.Row="0">
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" >
<CheckBox x:Name="cbx_state" Tag="{Binding}"/>
<TextBlock x:Name="txt_string" Text="{Binding}" VerticalAlignment="Center" FontSize="34" />
</StackPanel>
</DataTemplate>
</ItemsControl.ItemTemplate>
</ListBox>
我正在嘗試獲取cbk_state,以便我可以設置其checked屬性。我用來獲取復選框的功能是
private void GetItemsRecursive(DependencyObject lb)
{
var childrenCount = VisualTreeHelper.GetChildrenCount(lb);
for (int i = 0; i < childrenCount; i++)
{
var child = VisualTreeHelper.GetChild(lb, i);
if (child is ListBoxItem)
{
MessageBox.Show(child.GetType().ToString());
return;
}
GetItemsRecursive(child);
}
}
問題是,我得到ChildrenCount零每次。 我已經經歷了幾種方法,但沒有使用過。也嘗試過這種方法,但是在這里我沒有得到ListBox的ItemContainerGenerator。
我是新來的WP8編程PLZ help.Thanks
您是否在詢問獲取Checkbox
的Checked
屬性?
是這個你要找的人? 使用VisualTreeHelper
在Parent
找到Children
控件的示例代碼:
private ChildControl FindVisualChild<ChildControl>(DependencyObject DependencyObj)
where ChildControl : DependencyObject
{
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(DependencyObj); i++)
{
DependencyObject Child = VisualTreeHelper.GetChild(DependencyObj, i);
if (Child != null && Child is ChildControl)
{
return (ChildControl)Child;
}
else
{
ChildControl ChildOfChild = FindVisualChild<ChildControl>(Child);
if (ChildOfChild != null)
{
return ChildOfChild;
}
}
}
return null;
}
嗨, 這里有解決方案。 無需將虛擬化屬性設置為簡單。
private void GetItemsRecursive(DependencyObject lb)
{
var childrenCount = VisualTreeHelper.GetChildrenCount(lb);
for (int i = 0; i < childrenCount; i++)
{
DependencyObject child = VisualTreeHelper.GetChild(lb, i);
if (child is CheckBox) // specific/child control
{
CheckBox targeted_element = (CheckBox)child;
targeted_element.IsChecked = true;
if (targeted_element.IsChecked == true)
{
return;
}
}
GetItemsRecursive(child);
}
}
DependencyObject child = VisualTreeHelper.GetChild(lb,i); 而不是VAR孩子
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