Question

How do I update a single item in an ObservableCollection class?

I know how to do an Add. And I know how to search the ObservableCollection one item at a time in a “for” loop (using Count as a representation of the amout of items) but how do I chage an existing item. If I do a “foreach” and find which item needs updating, how to I put that back into the ObservableCollection>

Answer 1

You don’t need to remove item, change, then add. You can simply use LINQ FirstOrDefault method to find necessary item using appropriate predicate and change it properties, e.g.:

var item = list.FirstOrDefault(i => i.Name == "John");
if (item != null)
{
    item.LastName = "Smith";
}

Removing or adding item to ObservableCollection will generate CollectionChanged event.