如何替换列表框中的项目？

Question

I have a ListBox which contains a ContentMenu like follows:

<ListBox x:Name="lb_Configuration" SelectionMode="Single" SelectionChanged="lb_Configuration_SelectionChanged" ItemsSource="{Binding Products}" SelectedItem="{Binding SelectedProduct}" >
     <ListBox.ContextMenu>
          <ContextMenu>
               <MenuItem Header="Delete" Click="MenuItemDelete_Click"/>
               <MenuItem Header="Replace" Click="MenuItemReplace_Click"/>
               <MenuItem Header="Insert" Click="MenuItemInsert_Click"/>
          </ContextMenu>
     </ListBox.ContextMenu>                                                    
</ListBox>

When I want to Delete the item in the ListBox :

private void MenuItemDelete_Click(object sender, RoutedEventArgs e)
{
     Product itemToDelete = lb_Configuration.SelectedItem as Product;
     if (lb_Configuration.SelectedIndex < 0) return;
     else
     {
         lb_Configuration.Items.RemoveAt(lb_Configuration.SelectedIndex);
     }

}

Now the problem is I also want to replace the SelectedItem in the listbox, so I assuming that I also should popup a ContextMenu and binding the ItemsSource to it? How I suppose to do this? Thanks in advance!

Answer 1

You should be able to just delete the old entry the same way you did it in the delete method. Then just use Items.InsertAt(Int32, Object) to insert an item into that same index.

For example,

private void MenuItemReplace_Click(object sender, RoutedEventArgs e)
{
     Product replacementProduct = new Product();
     // Grab the old index
     int index = lb_Configuration.SelectedIndex;
     // Do any product setup configuration here 

     if (index < 0) return;
     else
     {
         // Remove, insert, and refresh the ListBox
         lb_Configuration.Items.RemoveAt(index);
         lb_Configuration.Items.InsertAt(index, replacementProduct); 
         lb_Configuration.RefreshItems();
     }
}

If you want more details look at ListBox.Items.InsertAt()