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using System;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using Xamarin.Forms.CustomAttributes;
using Xamarin.Forms.Internals;
#if UITEST
using NUnit.Framework;
#endif
namespace Xamarin.Forms.Controls.Issues
{
[Preserve(AllMembers = true)]
[Issue(IssueTracker.Bugzilla, 55365, "~VisualElement crashes with System.Runtime.InteropServices.COMException", PlatformAffected.UWP)]
public class Bugzilla55365 : TestContentPage
{
readonly StackLayout _itemsPanel = new StackLayout();
readonly DataTemplate _itemTemplate = new DataTemplate(CreateBoxView);
readonly StackLayout _layout = new StackLayout();
#if UITEST
[Test]
public void ForcingGCDoesNotCrash()
{
RunningApp.WaitForElement("Clear");
RunningApp.Tap("Clear");
RunningApp.Tap("Garbage");
RunningApp.WaitForElement("Success");
}
#endif
protected override void Init()
{
var viewModel = new ObservableCollection<_55365Item>
{
new _55365Item { Subject = 65 }
};
viewModel.CollectionChanged += OnCollectionChanged;
_itemsPanel.BindingContext = viewModel;
foreach (_55365Item item in viewModel)
{
_itemTemplate.SetValue(BindingContextProperty, item);
var view = (View)_itemTemplate.CreateContent();
_itemsPanel.Children.Add(view);
}
var clearButton = new Button { Text = "Clear", Command = new Command(o => viewModel.Clear()) };
_layout.Children.Add(clearButton);
var collectButton = new Button { Text = "Garbage", Command = new Command(o =>
{
GC.Collect();
GC.WaitForPendingFinalizers();
_layout.Children.Add(new Label {Text = "Success"});
}) };
_layout.Children.Add(collectButton);
_layout.Children.Add(_itemsPanel);
Content = _layout;
}
static object CreateBoxView()
{
var boxView1 = new BoxView { HeightRequest = 100, Color = new Color(0.55, 0.23, 0.147) };
var setter1 = new Setter { Property = BoxView.ColorProperty, Value = "#FF2879DD" };
var trigger1 = new DataTrigger(typeof(BoxView)) { Binding = new Binding("Subject"), Value = 65 };
trigger1.Setters.Add(setter1);
boxView1.Triggers.Add(trigger1);
return boxView1;
}
void OnCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (e.Action == NotifyCollectionChangedAction.Reset)
{
// reset the list
_itemsPanel.Children.Clear();
}
}
[Preserve(AllMembers = true)]
public class _55365Item
{
public int Subject { get; set; }
}
}
}
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