【发布时间】：2017-08-16 20:33:06
【问题描述】：
我有一个如下所示的主详细信息
public partial class LeaguesMDPage : MasterDetailPage
{
public LeaguesMDPage()
{
InitializeComponent();
Master = new LeaguesPage();
Detail = new NavigationPage(new DivisionsPage(new League()));
}
}
League Page（Master）设计有一个如下的列表视图
<ListView
ItemsSource="{Binding Leagues}"
SelectedItem="{Binding SelectedLeague, Mode=TwoWay}"
IsPullToRefreshEnabled="True"
RefreshCommand="{Binding UpdateLeagues}"
IsRefreshing="{Binding IsBusy}"
>
后面的代码是
public partial class LeaguesPage : ContentPage
{
LeaguesViewModel vm;
public LeaguesPage()
{
InitializeComponent();
BindingContext = vm = new LeaguesViewModel(this);
}
protected override void OnAppearing()
{
base.OnAppearing();
vm.UpdateLeagues.Execute(false);
}
}
在 LeaguesViewModel 中，我让 SelectedLeague 属性设置器更新详细信息页面并像这样隐藏 Master
League _SelectedLeague;
public League SelectedLeague
{
get { return _SelectedLeague; }
set
{
_SelectedLeague = value;
OnPropertyChanged();
if (_SelectedLeague != null)
{
Debug.WriteLine($"Navigating to DivisionsPage with LeagueID {_SelectedLeague.ID}");
var mdp = (MasterDetailPage)App.Current.MainPage;
Device.OnPlatform(
Android: () => { mdp.IsPresented = false; },
iOS: () => { mdp.IsPresented = false; },
WinPhone: () => { },
Default: () => { mdp.IsPresented = false; }
);
mdp.Detail = new NavigationPage(new DivisionsPage(_SelectedLeague));
_SelectedLeague = null;
}
}
}
这似乎有时像我希望的那样工作。它导航到新的 DivisionsPage 并隐藏 master。似乎在 iOS 和 UWP 上运行良好，但在 Android 上崩溃了以下
[0:] Server Returned 34 divisions
[0:] Navigating to DivisionsPage with LeagueID 12
[0:] UpdatePoolRankings: Called GetDivisionsAsync
03-23 02:40:52.151 W/Mono ( 6249): The request to load the assembly System.Core v4.0.0.0 was remapped to v2.0.5.0
03-23 02:40:52.151 D/Mono ( 6249): Unloading image System.Core.dll [0x99db7700].
03-23 02:40:52.151 D/Mono ( 6249): Image addref System.Core[0xaec169a0] -> System.Core.dll[0x9d166d00]: 11
03-23 02:40:52.151 D/Mono ( 6249): Config attempting to parse: 'System.Core.dll.config'.
03-23 02:40:52.151 D/Mono ( 6249): Config attempting to parse: '/Users/builder/data/lanes/4009/f3074d2c/source/monodroid/builds/install/mono-x86/etc/mono/assemblies/System.Core/System.Core.config'.
03-23 02:40:52.152 W/Mono ( 6249): The request to load the assembly System.Core v4.0.0.0 was remapped to v2.0.5.0
03-23 02:40:52.152 D/Mono ( 6249): Unloading image System.Core.dll [0x99db7700].
03-23 02:40:52.152 D/Mono ( 6249): Image addref System.Core[0xaec169a0] -> System.Core.dll[0x9d166d00]: 12
03-23 02:40:52.152 D/Mono ( 6249): Config attempting to parse: 'System.Core.dll.config'.
03-23 02:40:52.152 D/Mono ( 6249): Config attempting to parse: '/Users/builder/data/lanes/4009/f3074d2c/source/monodroid/builds/install/mono-x86/etc/mono/assemblies/System.Core/System.Core.config'.
03-23 02:40:52.383 D/Mono ( 6249): [0x9b5bf930] hill climbing, change max number of threads 4
[0:] Server Returned 3 divisions
03-23 02:40:52.421 F/ ( 6249): * Assertion at /Users/builder/data/lanes/4009/f3074d2c/source/mono/mono/metadata/sgen-tarjan-bridge.c:1139, condition `xref_count == xref_index' not met
03-23 02:40:52.421 F/libc ( 6249): Fatal signal 6 (SIGABRT), code -6 in tid 6249 (ClubApp.Droid)
InspectorDebugSession(21): Disposed
InspectorDebugSession(21): HandleTargetEvent: TargetExited
如果需要更多详细信息，请告诉我，谢谢！
【问题讨论】：
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能否分享一个可以重现此问题的基本演示？
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@ElvisXia-MSFT 这是一个简化版本，但我已经能够在这里重现问题bitbucket.org/schnabs/clubapp_42990427 要回购一定要使用 android 并在循环中继续点击打开主控，然后选择从列表中，打开主，从主列表中选择等等，直到它崩溃
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我发现另一个人有这个问题bugzilla.xamarin.com/show_bug.cgi?id=54120 另外我认为这是它来自单声道github.com/mono/mono/blob/master/mono/metadata/…
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我也有同样的问题！
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在我的情况下，我也使用主从。在我的详细信息中，我有一个 ListView，它导航到另一个具有 ListView 的页面。当我回去时，有时应用程序会崩溃并显示完全相同的消息。我正在使用 Xamarin 表单
标签： android xamarin mvvm xamarin.forms master-detail