I have a C# Store App and using DataTemplate Selectors to determine which type of Template to use in a ListView Control bound to an Array. Because it is templated, I cannot assign a dynamic x:Name to each ListView Row.
I need to be able to access the listview rows by Index and set the Visibility of them to On or Off. I have tried things like this, but the .ItemContainerGenerator
.ContainerFromItem(item);
return null
and I get a Nullable exception every time:
How do I access a control inside a XAML DataTemplate?
After doing some research, it appears that the above solution only works if I touch or have SelectedItem set. See here
Why does ItemContainerGenerator return null?
I need to be able to Call a Method, both on Page load(initial setting) and also on button click and modify certain rows visibility.
This should do what you want:
var items = grid.ItemsSource as IEnumerable<MyModel>;
foreach (var item in items)
{
var container = grid.ContainerFromItem(item);
var button = Children(container)
.Where(x => x is Button)
.Select(x => x as Button)
.Where(x => x.Name.Equals("MyButton"))
.FirstOrDefault();
if (button == null)
continue;
if (item.ShouldBeVisible)
button.Visibility = Visibility.Visible;
else
button.Visibility = Visibility.Collapsed;
}
Using this:
public List<Control> Children(DependencyObject parent)
{
var list = new List<Control>();
for (int i = 0; i < VisualTreeHelper.GetChildrenCount(parent); i++)
{
var child = VisualTreeHelper.GetChild(parent, i);
if (child is Control)
list.Add(child as Control);
list.AddRange(Children(child));
}
return list;
}
Best of luck!
来源:https://stackoverflow.com/questions/23645331/how-to-accessing-elements-in-xaml-datatemplate-listview-without-interacting-with