How do I use ObservableCollection in Xamarin.Forms?

How do I use ObservableCollection in Xamarin.Forms?

ObservableCollection is a dynamic data collection that provides notifications when items get added, removed, or when the whole list is refreshed. In Xamarin.Forms, you can bind it to UI elements like ListView or CollectionView.

Can you show me a code example?

Sure! Here's a simple example:

using System.Collections.ObjectModel;

public class MyViewModel
{
    public ObservableCollection<string> Items { get; set; }

    public MyViewModel()
    {
        Items = new ObservableCollection<string>();
        Items.Add("Item 1");
        Items.Add("Item 2");
    }
}

How do I bind this ObservableCollection to a ListView?

You can bind it in XAML like this:

<ListView ItemsSource="{Binding Items}">
    <ListView.ItemTemplate>
        <DataTemplate>
            <TextCell Text="{Binding .}" />
        </DataTemplate>
    </ListView.ItemTemplate>
</ListView>

What if I want to update an item in the collection?

You can simply access the item by its index and update it. For example:

Items[0] = "Updated Item";
``` This will automatically notify the UI of the change.