Accessing to a ListView at runtime to update an item - wpf

Question

I have to update a ListView item by clicking on a button. How do I find and update one at the runtime?
update: I mean I have to find the certain ListView item and update the text of this item only.

Answer 1

When ListViewItems were added to the ListView manually, you can look them up by their content and replace with new content like this (using System.Linq):
object contentToReplace = ...;
object newContent = ...;
ListViewItem item = listView.Items.Cast<ListViewItem>().FirstOrDefault(
lvi => lvi.Content == contentToReplace);
if (item != null)
{
item.Content = newContent;
}

Answer 2

You may use commands. For example:
namespace WpfApplication1
{
public partial class MainWindow : Window
{
public static readonly ICommand ItemClickCommand = new RoutedCommand("ItemClick", typeof(MainWindow));
public MainWindow()
{
InitializeComponent();
this.CommandBindings.Add(
new CommandBinding(
MainWindow.ItemClickCommand,
this.ExecuteItemClickCommand,
this.CanExecuteItemClickCommand));
}
private void CanExecuteItemClickCommand(object sender, CanExecuteRoutedEventArgs e)
{
e.CanExecute = e.Parameter is ListBoxItem;
}
private void ExecuteItemClickCommand(object sender, ExecutedRoutedEventArgs e)
{
// Here you can access ListBoxItem that holds a clicked button.
ListBoxItem listBoxItem = (ListBoxItem)e.Parameter;
listBoxItem.Content = "...";
}
}
}
Now, the only thing you need is to assign ItemClickCommand to a button and bind CommandParameter to corresponding ListBoxItem.
XAML example:
<Window ...
xmlns:local="clr-namespace:WpfApplication1">
<ListBox>
<ListBoxItem>
<ListBoxItem.Content>
<Button Command="{x:Static local:MainWindow.ItemClickCommand}"
CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=ListBoxItem}}"
Content="Click Me"/>
</ListBoxItem.Content>
<...>