Question

我需要在我的ViewModel中订阅我的某个模型的INotifyPropertyChanged。我的研究让我：How do I update the parent viewmodel when child viewmodel is updated。

我尝试按照＃3中的建议使用WeakSubscribe，但在进入和离开视图几次后，我的整个应用程序会冻结或崩溃。

以下是我在ViewModel中的Init()代码：

        foreach (var sale in Model.Sales)
        {
            sale.WeakSubscribe(delegate
            {
                Model.CalculateSalesTotals();
            });
        }

当应用崩溃时，我收到SIGSEGV：

I/mono-stdout(30334): mvx:Diagnostic:227.00 Showing ViewModel InvoiceAuthorizationViewModel
I/ActivityManager(  391): START u0 {flg=0x10000000 cmp=com.desco.escMobile/escmobile.android.views.InvoiceAuthorizationView (has extras)} from pid 30334
I/mono-stdout(30334): mvx:Diagnostic:227.19 Loading new ViewModel from Intent with Extras
D/dalvikvm(30334): GC_EXPLICIT freed 783K, 5% free 17252K/18068K, paused 2ms+8ms, total 53ms
I/mono-stdout(30334): MvxBind:Warning:227.59 Unable to bind: source property source not found Cirrious.MvvmCross.Binding.Parse.PropertyPath.PropertyTokens.MvxPr
opertyNamePropertyToken on null-object
I/mono-stdout(30334): MvxBind:Warning:227.61 Unable to bind: source property source not found Cirrious.MvvmCross.Binding.Parse.PropertyPath.PropertyTokens.MvxPr
opertyNamePropertyToken on null-object
I/mono-stdout(30334): MvxBind:Warning:227.63 Unable to bind: source property source not found Cirrious.MvvmCross.Binding.Parse.PropertyPath.PropertyTokens.MvxPr
opertyNamePropertyToken on null-object
I/dalvikvm(30334): Jit: resizing JitTable from 4096 to 8192
I/ActivityManager(  391): Displayed com.desco.escMobile/escmobile.android.views.InvoiceAuthorizationView: +755ms (total +1s259ms)
I/ActivityManager(  391): Displayed com.desco.escMobile/escmobile.android.views.InvoiceAuthorizationView: +1s279ms
I/ActivityManager(  391): Process com.android.vending (pid 30179) has died.
E/mono-rt (30334): Stacktrace:
E/mono-rt (30334):
E/mono-rt (30334):
E/mono-rt (30334): =================================================================
E/mono-rt (30334): Got a SIGSEGV while executing native code. This usually indicates
E/mono-rt (30334): a fatal error in the mono runtime or one of the native libraries
E/mono-rt (30334): used by your application.
E/mono-rt (30334): =================================================================
E/mono-rt (30334):
I/ActivityManager(  391): Process com.desco.escMobile (pid 30334) has died.
I/WindowState(  391): WIN DEATH: Window{42cf2e60 u0 com.desco.escMobile/escmobile.android.views.InvoiceAuthorizationView}
W/ActivityManager(  391): Force removing ActivityRecord{42e05b20 u0 com.desco.escMobile/escmobile.android.views.InvoiceAuthorizationView}: app died, no saved st
ate
I/WindowState(  391): WIN DEATH: Window{427bfbf0 u0 com.desco.escMobile/escmobile.android.views.DispatchListView}
I/WindowState(  391): WIN DEATH: Window{42b32b50 u0 com.desco.escMobile/escmobile.android.views.InvoiceDetailsView}
I/WindowState(  391): WIN DEATH: Window{43003e48 u0 com.desco.escMobile/escmobile.android.views.InvoiceAuthorizationView}
I/WindowState(  391): WIN DEATH: Window{42aea920 u0 com.desco.escMobile/escmobile.android.views.DispatchDetailsView}
D/dalvikvm(30434): Late-enabling CheckJNI
I/ActivityManager(  391): Start proc com.desco.escMobile for activity com.desco.escMobile/escmobile.android.views.InvoiceAuthorizationView: pid=30434 uid=10086
gids={50086, 3003, 1015, 1028}
D/Zygote  (  129): Process 30334 exited cleanly (255)

有什么建议吗？

使用MvvmCross的WeakSubscribe

0 个答案: