SyncfusionExamples / dispose-children-listview-xamarin

This repository contains sample about how to dispose of children of ListView in Xamarin.Forms (SfListView)

How to dispose of children of ListView in Xamarin.Forms (SfListView)

You can dispose the custom view that was loaded in SfListView.ItemTemplate in Xamarin.Forms SfListView by customizing the ItemGenerator.

You can also refer the following article.

https://www.syncfusion.com/kb/11417/how-to-dispose-of-children-of-listview-in-xamarin-forms-sflistview

C#

Created the custom Editor control in the PCL project that implements IDisposable.

namespace ListViewXamarin
{
    public class CustomEntry : Entry, IDisposable
    {
        public CustomEntry()
        {
            this.Text = "Country";
            BackgroundColor = Color.LightGray;
        }
        
        public void Dispose()
        {
            System.Diagnostics.Debug.WriteLine("custom control disposed");
        }
    }
}

XAML

Add the custom control in the ItemTemplate.

<syncfusion:SfListView x:Name="listView" ItemSize="60" ItemsSource="{Binding ContactsInfo}">
    <syncfusion:SfListView.ItemTemplate >
        <DataTemplate>
            <Grid x:Name="grid">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="70" />
                    <ColumnDefinition Width="250" />
                    <ColumnDefinition Width="*" />
                </Grid.ColumnDefinitions>
                <Image Source="{Binding ContactImage}" VerticalOptions="Center" HorizontalOptions="Center" HeightRequest="50" WidthRequest="50"/>
                <Label LineBreakMode="NoWrap" TextColor="#474747" Text="{Binding ContactName}" Grid.Column="1"/>
                <local:CustomEntry Placeholder="Enter here" Grid.Column="2"/>
            </Grid>
        </DataTemplate>
    </syncfusion:SfListView.ItemTemplate>
</syncfusion:SfListView>

C#

Extend the ItemGenerator and ListViewItem, and override the Dispose method to dispose the custom control.

public class ItemGeneratorExt : ItemGenerator
{
    public SfListView listView;
 
    public ItemGeneratorExt(SfListView listView) : base(listView)
    {
        this.listView = listView;
    }
 
    protected override ListViewItem OnCreateListViewItem(int itemIndex, ItemType type, object data = null)
    {
        if (type == ItemType.Record)
            return new ListViewItemExt(this.listView);
        return base.OnCreateListViewItem(itemIndex, type, data);
    }
}
 
public class ListViewItemExt : ListViewItem
{
    private SfListView listView;
 
    public ListViewItemExt(SfListView listView)
    {
        this.listView = listView;
    }
 
    protected override void Dispose(bool disposing)
    {
        if (this.Content != null)
        {
            var grid = this.Content as Grid;
            var customEntry = (CustomEntry)grid.Children.FirstOrDefault(o => o is CustomEntry);
            customEntry.Dispose();
        }
 
        base.Dispose(disposing);
    }
}