blob: ef20250c1d6bbe23f1c762ecaf92b03ef42c1861 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
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.TestCasesPages
{
[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()
{
GC.Collect();
GC.WaitForPendingFinalizers();
GC.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");
}
}
}
}
|
