Wp8:Not 能够获取列表框中的复选框

Question

我无法在列表框中找到复选框 xaml:

<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>

我正在尝试获取 cbk_state 以便我可以设置其选中的 property.The 函数我用来获取复选框的是

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);
      }
  }

问题是我每次都将 ChildrenCount 设为零。我已经尝试过几种方法，但没有 use.Also 尝试过 this 但在这里我没有为 listBox 获取 ItemContainerGenerator。

我是 wp8 编程新手 help.Thanks

Answer 1

你问的是获取 Checkbox 的 Checked 属性吗？

this 是您要找的人吗？。使用 VisualTreeHelper:

在 Parent 中查找 Children 控件的示例代码

 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;
    }

Answer 2

您好，找到了解决方案。无需设置虚拟化属性很简单。

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) 稍作改动；而不是 var child

Wp8:Not 能够获取列表框中的复选框

Wp8:Not able to get checkBox in listbox

c#

windows-phone-8

listbox