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Issue1895.cs
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Issue1895.cs
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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
namespace Xamarin.Forms.Controls.Issues
{
#if UITEST
[NUnit.Framework.Category(Core.UITests.UITestCategories.Github5000)]
#endif
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Github, 1895, "ListView with static BindingContext somehow leaks memory", PlatformAffected.iOS | PlatformAffected.Android)]
public class Issue1895
: ContentPage
{
public Issue1895()
{
var button = new Button { Text = "Push weak page" };
button.Clicked += async (sender, args) => await Navigation.PushAsync(CreateWeakReferencedPage());
Content = button;
}
static List<WeakReference> s_pageRefs = new List<WeakReference>();
static FakeProvider s_fakeProvider = new FakeProvider();
static Page CreateWeakReferencedPage()
{
GarbageCollectionHelper.Collect();
var result = CreatePage();
s_pageRefs.Add(new WeakReference(result));
return result;
}
class WeakReferencedPage : ContentPage
{
}
static Page CreatePage()
{
var page = new WeakReferencedPage();
var contents = new StackLayout();
contents.Children.Add(new Button
{
Text = "Next Page",
Command = new Command(() => page.Navigation.PushAsync(CreateWeakReferencedPage()))
});
contents.Children.Add(new Label
{
Text = string.Format("References alive at time of creation: {0}", s_pageRefs.Count(p => p.IsAlive)),
HorizontalOptions = LayoutOptions.CenterAndExpand
});
var listView = new ListView { BindingContext = s_fakeProvider };
listView.SetBinding(ListView.ItemsSourceProperty, "Items");
contents.Children.Add(listView);
page.Content = contents;
return page;
}
class FakeProvider
{
public ObservableCollection<string> Items { get; private set; }
public FakeProvider()
{
Items = new ObservableCollection<string>();
Items.Add("Item 1");
Items.Add("Item 2");
Items.Add("Item 3");
Items.Add("Item 4");
}
}
}
}