How to enable compiled binding for Xamarin.Forms ListView (SfListView)?
The Xamarin.Forms ListView has introduced compiled bindings to reduce CPU cycles and boost performance when using data binding.
You can enable compiled binding by using the special x:DataType attribute on any VisualElement in Xamarin.Forms SfListView.
You can also refer to the following document regarding the compiled bindings in Xamarin.Forms,
https://devblogs.microsoft.com/xamarin/compiled-bindings-xamarin-forms/
XAML
Define the namespace of the ViewModel and set BindingContext for the ContentPage.
<ContentPage xmlns:viewModel="clr-namespace:ListViewXamarin.ViewModel"
x:DataType="viewModel:ContactsViewModel">
<ContentPage.BindingContext>
<viewModel:ContactsViewModel/>
</ContentPage.BindingContext>
<ContentPage.Content>
<StackLayout>
<syncfusion:SfListView x:Name="listView" ItemSize="60" ItemsSource="{Binding ContactsInfo}">
</syncfusion:SfListView>
</StackLayout>
</ContentPage.Content>
</ContentPage>
When you are using template control like SfListView. you need to set up complied binding for the DataTemplate by using x:DataTye.
<ContentPage xmlns:model="clr-namespace:ListViewXamarin.Model">
<syncfusion:SfListView x:Name="listView" ItemSize="60" ItemsSource="{Binding ContactsInfo}">
<syncfusion:SfListView.ItemTemplate>
<DataTemplate x:DataType="model:Contacts">
<Grid x:Name="grid">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="70" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<Image Source="{Binding ContactImage}" VerticalOptions="Center" HorizontalOptions="Center" HeightRequest="50" WidthRequest="50"/>
<Grid Grid.Column="1" RowSpacing="1" Padding="10,0,0,0" VerticalOptions="Center">
<Label LineBreakMode="NoWrap" TextColor="#474747" Text="{Binding ContactName}"/>
<Label Grid.Row="1" Grid.Column="0" TextColor="#474747" LineBreakMode="NoWrap" Text="{Binding ContactNumber}"/>
</Grid>
</Grid>
</DataTemplate>
</syncfusion:SfListView.ItemTemplate>
</syncfusion:SfListView>
</ContentPage>
For SfListView.GroupHeaderTemplate, BindingContext of GroupHeaderTemplate will be the GroupResult that can be accessed from Syncfusion.DataSource.Extensions of Syncfusion.DataSource.
<ContentPage xmlns:result="clr-namespace:Syncfusion.DataSource.Extensions;assembly=Syncfusion.DataSource.Portable">
<syncfusion:SfListView x:Name="listView" ItemSize="60" ItemsSource="{Binding ContactsInfo}">
<syncfusion:SfListView.GroupHeaderTemplate>
<DataTemplate x:DataType="result:GroupResult">
<Grid BackgroundColor="#E4E4E4">
<Label Text="{Binding Key}" FontSize="18" FontAttributes="Bold" VerticalOptions="Center" HorizontalOptions="Start" Margin="20,0,0,0" />
</Grid>
</DataTemplate>
</syncfusion:SfListView.GroupHeaderTemplate>
</syncfusion:SfListView>
</ContentPage>
Output
Conclusion
I hope you enjoyed learning about how to enable compiled binding for Xamarin.Forms ListView.
You can refer to our Xamarin.Forms ListView feature tour page to know about its other groundbreaking feature representations and documentation, and how to quickly get started for configuration specifications.
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