maui-collectionview

name	maui-collectionview
description	> Use when this capability is needed.

CollectionView – .NET MAUI

Use CollectionView for displaying scrollable lists and grids of data. It replaces ListView and offers better performance, flexible layouts, and no ViewCell requirement.

Essential patterns

Basic setup

<CollectionView ItemsSource="{Binding Items}">
    <CollectionView.ItemTemplate>
        <DataTemplate x:DataType="models:Item">
            <HorizontalStackLayout Padding="8" Spacing="8">
                <Image Source="{Binding Icon}" WidthRequest="40" HeightRequest="40" />
                <Label Text="{Binding Name}" VerticalOptions="Center" />
            </HorizontalStackLayout>
        </DataTemplate>
    </CollectionView.ItemTemplate>
</CollectionView>

• Bind ItemsSource to an ObservableCollection<T> so the UI updates on add/remove.
• Each item template root must be a Layout or View — never use ViewCell.
• Always set x:DataType on DataTemplate for compiled bindings.

SwipeView — binding from inside DataTemplate

Commands inside a DataTemplate can't directly reach your ViewModel. Use RelativeSource AncestorType:

<SwipeItem Text="Delete"
           BackgroundColor="Red"
           Command="{Binding Source={RelativeSource AncestorType={x:Type viewmodels:MainViewModel}}, Path=DeleteCommand}"
           CommandParameter="{Binding}" />

Pull-to-refresh

Wrap CollectionView in a RefreshView. Set IsRefreshing back to false when done:

<RefreshView IsRefreshing="{Binding IsRefreshing}"
             Command="{Binding RefreshCommand}">
    <CollectionView ItemsSource="{Binding Items}" />
</RefreshView>

Incremental loading (infinite scroll)

<CollectionView ItemsSource="{Binding Items}"
                RemainingItemsThreshold="5"
                RemainingItemsThresholdReachedCommand="{Binding LoadMoreCommand}" />

⚠️ Do NOT use with StackLayout-based ItemsLayout — it has no virtualization and triggers infinite threshold-reached events. Always use LinearItemsLayout or GridItemsLayout.

Performance tips

• Use MeasureFirstItem for uniform item sizes — significantly faster than the default MeasureAllItems:

  <LinearItemsLayout Orientation="Vertical" ItemSizingStrategy="MeasureFirstItem" />
  

• Always use ObservableCollection<T>, not List<T>. Swapping a List forces a full re-render.
• Update collections on the UI thread — MainThread.BeginInvokeOnMainThread(() => Items.Add(item)).

Common gotchas

Issue	Fix
UI doesn't update when items change	Use ObservableCollection<T>, not List<T>.
App crashes or blank items	Never use ViewCell — use Grid, StackLayout, or any View as template root.
Items disappear or layout breaks	Always update ItemsSource and the collection on the UI thread (MainThread.BeginInvokeOnMainThread).
Incremental loading fires endlessly	Don't use StackLayout as layout; use LinearItemsLayout or GridItemsLayout.
EmptyView doesn't render correctly	Wrap custom empty views in ContentView.
Poor scroll performance	Use MeasureFirstItem sizing strategy for uniform item sizes.
Selected state not visible	Add VisualState Name="Selected" to the item template root element.
Binding errors in SwipeView commands	Use RelativeSource AncestorType to reach the ViewModel from inside the item template.

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