What is the process of utilizing IncrementalLoadingCollection from CommunityToolkit to enable Incremental loading in WinUI3?

edit

The process of utilizing IncrementalLoadingCollection from CommunityToolkit to enable Incremental loading in WinUI3 is as follows:

1. Install the Microsoft.Toolkit.WinUI.Controls NuGet package.

2. In your XAML code, create a ListView or GridView control and set its ItemsSource property to an instance of the IncrementalLoadingCollection class.

<controls:ListView ItemsSource="{x:Bind MyIncrementalCollection}" />

1. In your code-behind file, create an instance of the class that implements the IIncrementalSource<t> interface. This is the data source that the IncrementalLoadingCollection will use to load data.

private readonly MyDataSource _dataSource = new MyDataSource();

1. Create an instance of the IncrementalLoadingCollection class and pass in the data source instance and the page size.

public IncrementalLoadingCollection<MyDataItem, MyDataSource> MyIncrementalCollection { get; } = new IncrementalLoadingCollection<MyDataItem, MyDataSource>(_dataSource, pageSize: 20);

1. Implement the IIncrementalSource<t> interface in your data source class. This includes the GetPagedItemsAsync method which returns a collection of items for the specified page.

public async Task<IEnumerable<MyDataItem>> GetPagedItemsAsync(int pageIndex, int pageSize)
{
    // Retrieve data from the data source for the specified page
    var data = await _myDataService.GetDataAsync(pageIndex, pageSize);

    // Map the data to MyDataItem objects
    var items = data.Select(d => new MyDataItem { Name = d.Name, Value = d.Value });

    return items;
}

1. Customize the ListView or GridView control by adding columns or customizing the item template.

<controls:GridView ItemsSource="{x:Bind MyIncrementalCollection}">
    <controls:GridView.Columns>
        <controls:GridViewColumn Header="Name" Width="Auto" DisplayMemberBinding="{Binding Name}" />
        <controls:GridViewColumn Header="Value" Width="Auto" DisplayMemberBinding="{Binding Value}" />
    </controls:GridView.Columns>
</controls:GridView>

1. Run the application to see the incremental loading in action as you scroll through the list. The IncrementalLoadingCollection will use the GetPagedItemsAsync method to load items as needed, asynchronously.